The interbase resistance (R BB) and the intrinsic standoff ratio () can be programmed to any desired values by selecting two resistors. GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER, CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS, Arrangements for regulating or controlling the speed or torque of electric DC motors, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. Command signal circuit 50 operates as an RC circuit wherein capacitor 64 charges during positive half-cycles of AC line votage to develop a positive voltage at anode 54 of PUT 48 at a rate which is a function of l the effective resistance in series with the capacitor and (2) the voltage differential between the AC line voltage and the motor armature voltage. The combination of claim 19 wherein said reference signal circuit means comprises means for developing the reference voltage signal such that the magnitude thereof increases from an initial voltage level during said half-cycle of the AC source. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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However, because the secondary voltage of transformer 82 is reduced in amplitude from the AC line voltage, reference signal circuit 52 cannot charge capacitor 96 to as great a voltage as capacitor 64 is charged via line 8. Designed to enable the engineer to program Unijunction characteristics such as RBB, , IV, and IP by merely selecting two resistor values. Its main applications are relaxation oscillators, thyristor firing, pulse circuits and timing circuits. Upon the firing of PUT 48, a low-impedance path is provided between anode 54 and cathode 58 through which capacitor 64 discharges to. MINNESOTA MINING AND MANUFACTURING COMPANY, A CORP. OF DE. Programmable Unijunction Transistor has two states: A conduction state (there is current between A and K and the voltage drop is small) A cut-off state when the current from A (anode) to K (cathode) is very small. This programmed Gate voltage could be provided in other ways without using these resistors, for example by using . There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. When the adjustable speed selector resistor is operated toward a minimum speed position, the necessary signal differential for operating the solid state switch occurs later in the positive half-cycle so that the duration of application of the positive half-cycle of AC line voltage to the motor armature is reduced; when operated toward a maximum speed position, earlier in the half-cycle so that the duration is increased. Keep an eye on your inbox for news and updates from Digi-Key! PUT is basically a programmable UJT device in which intrinsic standoff ratio ( ) and peak voltage (Vp) programmed with the help of external resistors, . 2N6027 Programmable Unijunction Transistor is designed to enable the engineer to "program'' unijunction characteristics such as RBB, , IV, and IP by merely selecting two resistor values. The combination of claim 1 wherein said programmable switch means comprises a programmable unijunction transistor having an anode terminal, an anode gate terminal and a cathode terminal and electrically connected to said reference signal circuit means and to said command signal circuit means such that the reference signal is applied as a reference voltage signal at the anode gate terminal relative to the cathode terminal and the command signal is applied as a command voltage signal at the anode terminal relative to the cathode terminal to thereby develop a control voltage signal between the anode gate t1rminal and the anode terminal, said programmable unijunction transistor being operable in response to a certain magnitude of the control voltage signal for generating said operating signal for said solid state switch means. March 2, 2015 While useful for creating low frequency oscillator and timing functions, SCR triggering applications, and others, alternative techniquesfor addressing such needs have gained greater favor. The combination of claim 5 wherein for a constant motor load said command signal circuit means and said reference signal circuit means are responsive to a change in the peak-to-peak amplitude of the AC source voltage such that the changes in the command signal and the reference signal have substantially offsetting effects relative to said programmable switch means so as to cause the phase of said operating signal relative to the AC source voltage to remain substantially unchanged. The first branch comprises the series string consisting of diode 84, resistor 90 and the parallel combination of resistor 94 and capacitor 96; the second branch, the series string consisting of diode 86, resistor'92 and the parallel combination of diode 88, resistor 94 and capacitor 96. 8. The combination of claim 23 further including speed adjustment means for controlling the rate of increase of said command voltage signal such that the rate of increase is reduced in response to adjustment of said speed adjustment means toward a minimum speed position to thereby develop the certain magnitude of the control voltage signal for generating said operating signal later in said half-cycle of the AC source voltage and the rate of increase is increased in response to adjustment of said speed adjustment means toward a maximum speed position to thereby generate the certain magnitude of the control voltage signal for generating said operating signal earlier in said half-cycle of the AC source voltage. No. The combination of claim 25 wherein said reference signal circuit further comprises a stepdown transformer connected to said AC source for reducing the magnitude of the AC source voltage applied to said first timing circuit. The programmable unijunction transistor (PUT) is an improved version of UJT.But PUT is a four layer PNPN device it also known as small version of thyristors as shown in figure 12. The combination of claim 10 wherein said command signal circuit means develops said command signal at a rate greater than that at which said reference signal circuit means develops said reference signal after the magnitude of said command signal and the magnitude of said reference signal begin increasing from their respective initial signal levels. https://datasheetspdf.com/pdf/123036/NXP/BRY39/1, https://www.ebay.com/itm/BRY39/142326559329?hash=item212352f261:g:ZxQAAOSwzgBY1Av-, https://nz.rs-online.com/web/p/thermistor-ics/1857851/, https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20201025025832&SearchText=BRY39, Powered by SMFPacks Advanced Attachments Uploader Mod. Reference signal circuit 52 comprises a stepdown voltage transformer 82, diodes 84, 86 and 88, resistors 90, 92 and 94 and a capacitor 96. In this circuit the two resistors (15K and 27k) provide this programmed voltage by a voltage divider action. AC to DC using phase control, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, Specific control circuit element or device, MINNESOTA MINING AND MANUFACTURING COMPANY, A COR, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SARNS, INC.,;REEL/FRAME:003883/0150, MINNESOTA MINING AND MANUFACTURING COMPANY, ST. PA, ASSIGNMENT OF ASSIGNORS INTEREST. This video shows how to solve sample problems under the topic Programmable Unijunction Transistor (PUT).Two sample problems are illustrated in this video. The increased motor loading results in a drop in motor armature voltage. AC to DC, Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. This device has been characterized as a Programmable Unijunction Transistor (PUT), offering many advantages over conventional Unijunction Transistors. The series combination of a resistor 45 and a capacitor 47 is paralleled with the anode-cathode circuit of SCR 28 to protect SCR 28 from large rates of voltage change. The combination of claim 12 wherein said command signal circuit means and said reference signal circuit means are constructed to develop the command and reference signals respectively such that the time rate of change of the magnitude of the command signal and the time rate of change of magnitude of the reference signal are functions of the peak amplitude of the AC source voltage which so change relative to each other in response to a change in the peak amplitude of the AC source voltage that the certain magnitude of control voltage signal for generating said operating signal is developed at a relatively unchanged point in said half-cycle of the AC source voltage whereby compensation is provided for variations in the peak-to-peak amplitude of the AC source voltage. As can be seen, the anode terminal 78 of diode 76 is connected directly to line 8 and the cathode terminal 80 to one terminal of resistor 74. In the preferred embodiment of the invention, the lower limit of motor speed is zero rpm and therefore, SCR 28 is not triggered during the positive AC halfcycles. NEW JERSEY 07081 (212)227-6005 FAX: (973) 376-8960 U.S.A. In particular, one known type of motor control comprises a solid state switch, such as an SCR, which is controllably operated to connect the AC source to the DC motor during selected portions of the AC voltage cycle. Thus, the reference signal increases more rapidly. The action you just performed triggered the security solution. The combination of claim 5 wherein for a constant peak-to-peak amplitude of the AC source voltage said command signal circuit means causes said programmable switch means to generate said operating signal earlier in said half-cycle of the AC source voltage in response to increased differential between the AC source and armature voltages and later in said half-cycle in response to reduced differential. Any variation in AC line voltage affects both the command and reference signal circuits in offsetting fashion so that the point at which the necessary differential for operating the solid state switch occurs is at essentially the same point of the positivehalf-cycle. ' 12. A com- 1 June 5,1973. mand signal circuit and a reference signal circuit develop command and reference signals respectively which are applied to a solid state switch. The PUT is similar to the unijunction transistor (UJT), but its intrinsic standoff ratio can be set by two external resistors. 16. JavaScript is disabled. . Programmable unijunction transistors (PUTs) are a relative of Silicon Controlled Rectifier (SCR) devices, having a characteristic behavior somewhat like a unidirectional DIAC with a user-configurable threshold voltage. With such a circuit construction, the motor is operated at 0 120 volts DC from 115 volts hz. This device may also be used in special thyristor . The novel circuit structure for operating SCR 28 comprises a programmable unijunction transistor 48 (PUT) which fires SCR 28 in accordance with a command signal derived from a command signal. The combination of claim 8 wherein said command signal circuit means is constructed to develop the command signal such that the magnitude thereof increases from an initial signal level during said half-cycle of the AC source voltage and said reference signal circuit means is constructed to develop the reference signal such that the magnitude thereof increases from an initial signal level during said half-cycle of the AC source voltage. The E-B1 junction has negative resistance properties; it can switch between high and low resistance. These devices may also be used in special thyristor applications due to the availability of an anode gate. You will receive an email confirmation when your registration is complete. DC current gain as a function of anode gate current. It is to be observed that as a result, cathode 58 of PUT 48 is electrically connected through resistor 62 to the positive armature terminal 36. Edwin R. Arboleda Department of Computer and Electronics Engineering (DCEE) College of Engineering and Information Technology (CEIT) Cavite State University Indang, Cavite. Therefore, SCR 28 is triggered essentially instantaneously with the operation of PUT 48 to cause current to flow from line 8 to terminal 36 of armature 26. The primary winding 98 of transformer 82 is connected directly across lines v8 and 10. Programmable unijunction transistor/ Silicon controlled switch M3D082. This means that the device Ming voltage (the peak voltage V P) can also be programmed. 4. Back-to-back connected resistors R1 and R2 are the circuit's external resistors, which . These devices may also be used in special thyristor applications due to the availability of an anode gate. As will be more fully appreciated from later description, adjustment of the adjustable resistors 66 and 68 establishes upper and lower limits for motor speed while adjustable resistor 70 provides speed selection within the range defined by the upper and lower limits. 5. ;ASSIGNOR:SARNS, INC.,;REEL/FRAME:003883/0150, Circuit for eliminating current noises from d.c. motor, Circuit arrangement for controlling the speed of a D.C. motor, SPEED CONTROLLER FOR A UNIVERSAL MOTOR OPERATED ON AN AC VOLTAGE NETWORK, Circuitry and method for controlling the firing of a thyristor, Magnetic bearing device for motor-combined structure, Control of a brushless permanent-magnet motor, Full wave, plural condition d.c. motor control system, Circuit for controlling the speed of a motor, Full-wave adjustable motor speed control system with feedback, Pulsating current control system for series motors and the like using a controlled rectifier, Motor control circuit including motor current limiting means, Variable pulse width regulated power supply, Power control system for an A.C. induction motor, Control system for electrical precipitators, Universal-motor counter e. m. f. speed control circuit, AC power source voltage regulator including outward voltage slope control, Speed control for a universal electric motor, Power controller circuit with automatic correction for phase lag between voltage and current, Voltage regulator for permanent magnet generators, Commutating oscillator and current-limiter for solid state switching circuits, Control apparatus for motors and the like, Speed setting and control system for universal motors, Off delay timer and internally generated auxiliary direct current voltage source for a controlled rectifier alternating current switch for use therein, Improvements in or relating to speed-control circuits for commutator motors, Controlled rectifier speed-regulating systems for series commutator motors, Circuit arrangement in an electrical device operated with direct-current, especially in a timing relay. Digi-Key respects your right to privacy. Programmable unijunction transistors (PUTs) are a relative of Silicon Controlled Rectifier (SCR) devices, having a characteristic behavior somewhat like a unidirectional DIAC with a user-configurable threshold voltage. Would anyone know a modern replacement for this little fella? For more information please see our Privacy Notice and Cookie Notice. During negative half-cycles of AC line voltage, the negative secondary voltage of transformer 82 forward biases diode 86 so that the second branch provides a discharging path for discharging the charge which had been developed on capacitor 96 during the previous positive half-cycle of AC line voltage. Because the circuit elements of reference signal circuit 52 are nonadjustable, the voltage delivered to anode gate terminal 56 by reference signal circuit 52 is a function only of the magnitude of the AC line voltage. The novel circuit structure for operating SCR 28 comprises a programmable unijunction transistor 48 (PUT) which fires SCR 28 in accordance with a command signal derived from a command signal circuit 50 and a reference signal derived from a reference signal circuit 52. If you get stuck and really have to have a silicon controlled switch replacement I have an old frequency counter parts mule with about 50 of those in it. Suggest. Its has a four layered construction just like the thyristors and have three terminals named anode (A), cathode (K) and gate (G) again like the thyristors. The combination of claim 17 wherein said means for developing the time-varying command voltage signal comprises means for developing the command voltage signal at the anode of said programmable unijunction transistor relative to the cathode thereof such that the magnitude of the command voltage signal increases from an initial voltage level during said half-cycle of the AC source voltage. The combination of claim 12 wherein said command signal circuit means is constructed to develop the command signal at a rate greater than that at which the reference signal circuit means develops the reference signal once said signals begin increasing from their respective initial signal levels. The operation of PUT 48 has no significant effect upon the charging or discharging of capacitor 96. Registered users can track orders from their account dropdown, or click here. Many different circuits can be build with this transistor combination, The UJT has three terminals: an emitter (E) and two bases (B1 and B2) and so is sometimes known a "double-base diode". Application includes thyristortrigger, oscillator, pulse and timing circuits. End of preview. The simplest of all UJT circuits is the Relaxation Oscillator producing non-sinusoidal waveforms. A change in motor load affects only the command signal so that the necessary differential for operating the solid state switch occurs either earlier in the positive half-cycle for an increased load or later in the positive half-cycle for a reduced load to thereby maintain the selected motor speed in spite of load changes. Correspondingly, during the positive AC half-cycle the voltage at anode gate terminal 56 is initially greater than the anode voltage at terminal 54. As previously mentioned, resistor may be adjusted to vary the motor speed. The combination of claim 16 wherein said capacitor is electrically connected in parallel with the anodecathode circuit of said programmable unijunction tran-. 1 vote. 15. A unijunction transistor consists of two bases (B1, B2) attached to a resistive bar of silicon, and an emitter in the center. To illustrate how the circuit of the invention provides good speed regulation despite variations in motor loading, let it be assumed that the peak-to-peak AC line voltage is constant and the speed selection resistor 70 is set to a selected speed but that the motor load now increases. The combination of claim 8 wherein said command signal circuit means is constructed to develop the command signal such that the magnitude thereof increases in the positive direction from an initial signal level during the initial portion of said half-cycle of the AC source voltage and said reference signal circuit means is constructed to develop the reference signal such that the magnitude thereof increases from an initial signal level during said initial portion of said halfcycle of the AC source voltage, the initial signal level of the command signal relative to the initial signal of the reference signal being less than the certain magnitude of the control voltage signal for generating said operating signal. The combination of claim 1 wherein said command signal circuit means is responsive to the voltage differential between the peak amplitude of the AC source voltage and the motor armature voltage such that the command signal is a function of the voltage differential between the peak amplitude of the AC source voltage and the motor armature voltage. The combination of claim 25 wherein said reference capacitor is electrically connected in parallel with the anode gate -cathode circuit of said programmable unijunction transistor and the electrical connection of said two capacitors to the cathode of said programmable unijunction transistor is electrically connected to the positive terminal of the motor armature. PUT abbreviation stands for Programmable Uni-junction Transistor. Rating: 1. The seller corrected the pic (re-check the link) and is willing to accept offers. 1. ;ASSIGNOR:SARNS, INC.,;REEL/FRAME:003883/0150. I've got quite a few faulty parts on this primary. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. tnuuG 3205 uuzuuuuum filull'u'llllll'l J mum INVEN PHILIP J. T505125 BY 740M144, 9M. As long as it has high BW. What is the abbreviation for Programmable Uni -junction . The drawing illustrates a schematic diagram of an exemplary, but preferred, form of the motor control circuit of the invention. It is widely used in the triggering circuits for silicon controlled rectifiers. However, the voltage rise across capacitor 64 lags the AC line voltage because (1) the AC line voltage must rise to a positive magnitude sufficient to overcome the bucking voltage of armature 26 and (2) thereafter the voltage rise is further delayed because of the inherent phase delay in an RC network. Furthermore, let it be assumed that lower and upper speed limiting resistors 66 and 68 are in adjustment and that speed selector resistor 70 is set in the middle of its range. Therefore, when the instantaneous magnitude of the AC line voltage exceeds the motor armature voltage, diode 76 becomes forward biased and capacitor 64 begins charging at a rate determined by the equivalent series resistance between capacitor 64 and diode 76. The combination of claim 20 wherein said command signal circuit means and said reference signal circuit means are constructed such that the differential between the initial levels of said reference voltage signal and of said command voltage signal is less than the certain magnitude of the control voltage signal for generating said operating signal and the differential between the reference voltage signal and the command voltage signal increases during said half-cycle of the AC source voltage. As the name implies, "Programmable Unijuntion Transistor", there needs to be a programmed voltage supplied to the Gate pin. Supplied in an inexpensive TO92 plastic package for highvolume requirements, this package is readily adaptable for use in automatic insertion equipment. 22. 6. 9. Supplied in an inexpensive TO92 plastic package for highvolume requirements, this package is readily adaptable for use in automatic insertion equipment. The combination of claim 21 wherein the increasing differential between the reference voltage signal and the command voltage signal reaches the certain magnitude of the control'voltage signal for generating said operating signal during said half-cycle of the AC source voltage. A Controlled Negative-Resistance for Realization of Certain Network Functions; 72 SCR Applications a Few of the More Common Areas of Application; Introduction to Electronics . 57 ABSTRACT An adjustable speed control circuit for a DC motor which automatically compensates for variations in both motor loadand the voltage level of an AC source which supplies power for driving the motor. 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Of Electronics EngineeringWalchand Institute of Technology, Solapur The combination of claim 17 wherein the electrical connection between said command capacitor and the cathode of said programmable unijunction transistor is electrically connected to one terminal of the motor armature, the other terminal of the motor armature is electrically connected to one terminal of the AC voltage source and said command signal circuit means is electrically connected to the other terminal of said AC voltage source and said means for developing the command voltage signal includes means for restricting current flow from said AC source to unidirectional flow from said other terminal of said AC source through said capacitor and through the motor armature to said one terminal of the AC source to develop said increasing command voltage signal across the anode-cathode circuit of said programmable unijunction transistor during an initial fraction of said half-cycle of the AC source voltage. 11. The construction of PUT (Programmable Uni Junction Transistor) is similar to that of SCR, it has four layer of semiconductor material PNPN or NPNP structure, with three junction J1 J2 and J3, terminal which is connected to the P-Type material is called anode and the terminal which is connected to N-Type material is called cathode. 1 vote. A change in motor load affects only the command signal so that the necessary differential for operating the solid state switch occurs either earlier in the positive half-cycle for an increased load or later in the positive half-cycle for a reduced load to thereby maintain the selected motor speed in spite of load changes. How many terminals does programmable unijunction transistor have? Cathode terminal 58 is directly connected to gate terminal 60 of SCR-28 and a resistor 62 is electrically connected between gate 60 and cathode .34 of SCR 28. 14. The solid state switch operates in response to a certain differential between the command signal and the reference signal to cause current to be conducted from the AC source to the motor during the positive half-cycle of the AC voltage. The firing point in the positive half-cycle is such that the amount of power delivered through SCR 28 during the remaining portion of the positive half-cycle is sufficient to drive the motor load while maintaining the motor speed. in turn trigger SCR 28. The net effect is to substantially reduce any more speed variations which would otherwise accompany changes in the line voltage. 28. MINNESOTA MINING AND MANUFACTURING COMPANY, ST. PA, Free format text: Furthermore, it is contemplated that modification may be had to the command and reference signal circuits to develop command and reference signals of various waveshapes for operating PUT 48 in a manner not inconsistent with the principles set forth in this disclosure. 21. Cloudflare Ray ID: 776736c9eab5fc59 This reduction in armature voltage results in the AC line voltage overcoming the armature voltage earlier in the half-cycle so that capacitor 64 begins charging earlier in the half-cycle. Filter 30 provides smooth, quiet motor operation with armature 26 being paralleled by a resistor 38 and a capacitor 40 of filter 30 and the negative armature terminal 42 beingconducted through the series combination of a resistor 44 and an inductor 46 of filter 30 to line 10. Resistors 66 and 68 are individually arranged in series with resistors 72 and respectively forming two series resistance combinations which are paralleled with each other and connected between the other terminal of resistor 74 and one terminal of capacitor 64. c1 ..31s/331,31s/345 511 int. Programmable RBB, , IV and IP. Low On-State Voltage 1.5 Volts Maximum @ IF = 50 mA Low Gate to Anode Leakage Current 10 nA Maximum High Peak Output Voltage 11 Volts Typical Low Offset Voltage 0.35 Volt Typical (RG = 10 k ohms), All Rights Reserved datasheetbank.com [, BRY56 BRY56A BRY56B BRY56C Q68000-A803 Q68000-A803-S1 Q68000-A803-S2 Q68000-A803-S3, 2N6027 2N6027G 2N6027RLRA 2N6027RLRAG 2N6028 2N6028G 2N6028RLRA 2N6028RLRAG 2N6028RLRM 2N6028RLRMG, 2N6027 2N6028 2N6028RLRA 2N6028RLRM 2N6028RLRP. so basically you have a pn junction but it acts quite different from the pn The anode gate is effectively not used (although R6007 does reduce the sensitivity of the cathode gate a bit by killing the gain of the transistor action of the top three layers of the device (PNP) at low currents), which means you could probably substitute a sensitive gate TO-92 small signal SCR, however as this is part of the control circuit of a switched mode PSU, if the BRY39 is known to be faulty, exact replacement with one from a reputable specialist NOS supplier is strongly recommended. 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Uses cookies to help personalise content, tailor your experience and to keep you logged in if register... The line voltage junction has negative resistance properties ; it can switch between high and low resistance anode at. You were doing when this page came up and the Cloudflare Ray ID found at bottom! 56 is initially greater than the anode voltage at anode gate variations would. And the Cloudflare Ray ID found at the bottom of this page on primary... Circuit of said Programmable Unijunction tran- SQL command or malformed data 64 discharges to performed! In if you register DC current gain as a function of anode gate current in automatic insertion.. Jersey 07081 ( 212 ) 227-6005 FAX: ( 973 ) 376-8960.! Variations which would otherwise accompany changes in the line voltage 0 120 volts DC programmable unijunction transistor function volts. Sarns, INC., ; REEL/FRAME:003883/0150 were doing when this page and 10,! 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