Electrical Equipment Circuit

SCS_SHIFT_REGISTER

Published:2009/7/24 2:01:00 Author:Jessie

Shill pulse turns off all silicon controlled switches. Trailing edge of turnoff pulse is differentiated for turning on appropriate stages. 2N2714 will easily drive ten scs stages.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 432.   (View)

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HEAVY_DUTY_WELDER_CONTROL

Published:2009/7/24 2:18:00 Author:Jessie

Flip-flop thyratron circuit makes pairs of ignitrons share load alternately, to prevent overloading of tubes when welder is used for heavier weld or for longer lime than originally intended.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York, 1956, p 342.   (View)

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HEAT_PROGRAM_TIMER

Published:2009/7/24 2:12:00 Author:Jessie

Controls weld energy for production-line welding of electron tubes and other small components. Functions controlled are low heat, weld heat, up-slope time, weld time, and down-slope time. Adjustable potentiometers permit changing each of these times.-A. V. Ronis, Heat Program Timer Controls Weld Energy, Electronics, 31:23, p 76-78.   (View)

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Single_cell_temperature_compensated_crystal_clock

Published:2009/7/24 2:11:00 Author:Jessie

This 1.5-V oscillator provides a temperature-compensated output without the use of a current-consuming oven. Figure 8-15B shows the compensated-versus-uncompensated oscillator drift. Current consumption is 850 μA or less. The varactor diode tunes the oscillator frequency as the dc bias varies. An ambient-temperature-dependent bias is generated by the remaining circuitry.   (View)

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SPOT_WELDING__TIMER

Published:2009/7/24 2:10:00 Author:Jessie

Five-thyratron sequence timer for resistance-type spot welder meets auto industry requirements for efficiency and reliability.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York,1956,p 343.   (View)

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TIMER_FOR_RESISTANCE_WELDING_GUN

Published:2009/7/24 2:10:00 Author:Jessie

Provides exact timimg control for squeeze, weld, and hold, us well as fast repeat recycling, by control of thyratrons. Can be operated anywhere from single-shot to over 600 spots per minute. Timer is designed for fail-safe peration.-J. Markus, Handbook of Electronic Control Circuits, McGraw-Hill, New York, 1959, p 322.   (View)

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INDUSTRIAL_BRAZING_CIRCUIT

Published:2009/7/24 2:17:00 Author:Jessie

Applies high r-f power peaks in short-duration pulses, such as 11 kw for 2 sec or 45 kw for 0.5 sec, repeated every 5 sec. Settings of time delay relays RE1 and RE2 determine pulse lengths.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York, 1956, p 340.   (View)

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FOUR_FUNCTION__WELDING_TIMER

Published:2009/7/24 2:15:00 Author:Jessie

Thyratrons serve as relays for controlling squeeze time, weld time, hold time, and off time in high-speed resistance welding， Control Provides fail-safe operation, reduces transients by accurraely adjusting ignitron firing angle, and gives accurate repetition of timing cycle.-S. C. Rocka fellow, Electronic Control Times High-Speed Welding cycle,Electronics,31:33,p 70－73.   (View)

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MODULATOR_CONTROL_FOR_FULL_WAVE_SCR_SWITCH

Published:2009/7/24 2:26:00 Author:Jessie

Used with high-power a-c scr switching circuit to provide regulation by varying ratio of full on cycles to full off cycles of supply voltage. Also suitable for oven and furnace temperature control, motor control, and flashers. With R10 at 10K, variaion of R11 from zero to maximum produced 40:1 load voltage swing.-F. W. Gutzwiller, RFI-Less Switching with SCRs, EEE, 12:3, p 51-53.   (View)

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PRECISION_WELD_INTERVAL_TIMER

Published:2009/7/24 2:21:00 Author:Jessie

Stable timer provides intervals repetitive to accuracy of 0.75%, from 1 to 110 sec in 1-sec increments. Can be used for welder, enlarger, and other industrial controls.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York, 1956, p 292.   (View)

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PHOTOELECTRIC_WELD_MONITOR

Published:2009/7/24 2:23:00 Author:Jessie

Shuts off r-f generator automatically after copper lows when welding exhaust tubulation to metal vacuum tube. Light is refected by molten copper into phototube that initiates shutdown, with 0.6 sec delay introduced intentionally to allow copper to low around entire seal.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York, 1956, p 344.   (View)

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10_MINUTE_STEPPED_SWEEP

Published:2009/7/24 2:59:00 Author:Jessie

Provides long stepped sweeps required for swept-frequency ionosondes, with 100-v amplitude. Schmitt trigger V3 detects end of rundown and initiates recharging of C1.-K. Perry, Long Staircase Generator, Electronics, 35:35, p 54.   (View)

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NOISE_BLANKER

Published:2009/7/2 3:48:00 Author:May

Minimizes effects of shortduration high-amplitude low-repetition-rate noise such as auto ignition noise, power-line arcing, and make-or-break switching. Developed for use in Collins ARR-41 receiver, where it is inserted between plate of second mixer and 500-kHz first IF amplifier. Q1 and its doubletuned drain circuit form low-gain bandpass amplifier that removes remaining local oscillator signal and sets bandwidth at about 50 kHz. Signal is then split into two channels. Q2 in main channel drives 50-ohm low-pass delay network with 700-kHz cutoff, feeding double-balanced mixer DBM operated as current-controlled attenuator. In other channel, noise amplifier U2 drives pulse detector Q3 and AGC detector CR1. Opamp U1 amplifies AGC and controls gain of U2. R4 is threshold adjustment. Gates U3B and U3C form mono used with gates of U3 to develop proper phase and current amplitude for operating blanking gate.-W. Stewart, Noise Blanker Design. Ham Radio. Nov. 1977. p 26-29.   (View)

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NEURON_SIMULATOR

Published:2009/7/24 2:39:00 Author:Jessie

Simulates many of functions of eye and ear nerve cells. Output consists of 6.Mc pulses.-Artificial Neuron Uses Transistors, Electronics, 32:7, p 74.   (View)

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Single_cell_undervoltage_indicator

Published:2009/7/24 2:37:00 Author:Jessie

This circuit is essentially a voltage-controlled multivibrator that causes a red LED (D1) to flash. The flash rate is set by voltage from the single cell (about 1.4 sec-1 for 1.2 V, with a 300-μA drain, and 5.5 sec-1 at 1.55 V, with a 800-μA drain. To get an equivalent visibility with continuous operation would require more than 5-mA drain.   (View)

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LOAD_SIMULATOR

Published:2009/7/24 2:46:00 Author:Jessie

Is more economical than large rheostat when testing semiconductor power supplies for ripple attenuation and output impedance at different values of load current. Presents variable load to 30-V supply rated at 0.6 amp.-Inexpensive Load Simulator, Electronic Circuit Design Hond. book, Mactier Pub. Corp., N.Y., 1965 p 165.   (View)

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Double_ended_voltage_monitor

Published:2009/7/24 2:44:00 Author:Jessie

This circuit is similar to that of Fig. 8-26, except that the LED flash rate increases when the supply goes above 6 V, but below 15 V. The flash rate approaches zero near either limit. The minimum operating threshold is given by: The maximum operating threshold is given by: Typical circuit power drain is about 500 μA.   (View)

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ENLARGER_TIMER_STEP_CIRCUIT_0_TO_59_s

Published:2009/7/24 3:06:00 Author:Jessie

This circuit shows how to set up a NE555 timer to produce timing steps from 0 to 59 s in 1-s intervals.   (View)

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SIMPLE_SYNCHRONIZED_SLAVE_PHOTO_FLASH

Published:2009/7/24 3:04:00 Author:Jessie

A light-activated silicon-controlled rectifier (Q1) is triggered by a flash of light from the master flash unit.   (View)

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SEGMENTED_SWEEP_DISPLAY

Published:2009/7/24 3:03:00 Author:Jessie

Staircase voltage builds up across C2 when pulses from Q2 turn Q3 on momentarily. R3 controls voltage amplitude of each step. R1 controls rate of free-running oscillator tube.-J. E.Russell, Ten Signals at a Glance, Electronics, 37:19, p 54-57.   (View)

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