Electrical Equipment Circuit

CHOPPER_AND_PHASE_DETECTOR

Published:2009/7/21 8:01:00 Author:Jessie

Input gate signal operates Schmitt trigger V1, to give identical but oppositely phased signals for phase detector of instrument for measuring phase differences between two signals.-R. T. Stevens, Precision Phasemeter for CW or Pulsed UHF, Electronics, 33:10, p 54-57.   (View)

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TV_video_signal_processor_circuit_2

Published:2009/7/21 8:00:00 Author:Jessie

TV video signal processor circuit. The EGG 1065 is a 16-pin DIP (courtesy GTE Sylvania Incorporated).   (View)

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Serial_data_transfer_circuit_into_shift_registers_with_parallel_output_to_data_bus

Published:2009/7/21 8:22:00 Author:Jessie

Serial data transfer circuit into shift registers with parallel output to data bus (courtesy Analog Devices, Inc.).   (View)

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MICROWATTS_AT_QUIESCENCE

Published:2009/7/21 8:05:00 Author:Jessie

Circuit has same characteristics as single unijunction transistor but dissipates only microwatts of power when off.-R. A. Wilson, Pnp Plus Npn Equals Unijunction transistor, Electronics, 38:5, p 94-95.   (View)

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Cotor_TV_chroma_signal_amplifier

Published:2009/7/21 8:05:00 Author:Jessie

Cotor TV chroma signal amplifier. The EGG 1131 isa 16-pin DIP and conststs of a chromaamplifier, an ACC amplifier, aburst gate amplifier, an ACC peak detector, a color killer, aDC chroma gain control, a DC uni-color control and a balanced sampling circuit forthe burst signal. By connecting the control terminal of the unicolor and contrast terminal of the ECG1131 it is possible to control chroma gain and contrast simultaneously (courtesy GTE Sylvania Incorporated).   (View)

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MOS_48_based_analog_processor

Published:2009/7/21 8:19:00 Author:Jessie

MOS-48 based analog processor. This circuit shows the MP-10 D/A convener and the MP-20 A/D convener connected to the 8748 processor (courtesy Intel Corporation).   (View)

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TV_vertical_sync_delay_circuit

Published:2009/7/21 8:18:00 Author:Jessie

TV vertical sync delay circuit (courtesy Motorola Semiconductor Products Inc)   (View)

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Memory_mapped_output_device_interfaced_with_the_MCS_80_8080A_CPU_system

Published:2009/7/21 8:16:00 Author:Jessie

Memory mapped output device interfaced with the MCS-80 (8080A) CPU system (courtesy Analog Devices, Inc.).   (View)

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Full_wave_SCR_bridge_power_supply_for_cotor_TV_rated_at_80_volts_15_amperes

Published:2009/7/21 8:15:00 Author:Jessie

Full-wave SCR bridge power supply for cotor TV rated at 80 volts, 1.5 amperes. This circuit is designed for 19-inch color receivers (courtesy Motorola Semiconductor Products Inc.).   (View)

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Color_TV_chroma_processor

Published:2009/7/21 8:12:00 Author:Jessie

Color TV chroma processor. The ECG1158 includes the functions for chroma amplifier, oscillator, ACC, color killer and color control (courtesy GTE Sylvania Incorporated).   (View)

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TV_video_processor

Published:2009/7/21 8:10:00 Author:Jessie

TV video processor. The EGG 1134 contains a picture IF amplifier, avideo detector,a video amplifier,keyed AGC with noise immunity, delayed AGC for thetuner, an AFT amplifier, a sound IF amplifier, asound carrier detector, a4.5 MHz sound carrier amplifier and a reverse AGC voltage for MOS FET tuner. Coil data is shown below schematic (courtesy GTE Sylvania Incorporated).   (View)

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HOURS_OF_DELAY

Published:2009/7/21 9:16:00 Author:Jessie

Capacitor starts charging from -12 v to +12 v when switch is opened.Diode begins conducting at ground potential, and operational trigger trips when diode passes 2 na. Timing accuracy is high.-P. Lefferts, Operational Trigger For Precise Control, Electronics, 37:28, p 50-55.   (View)

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BALANCED_MODULATOR_DEMODULATOR

Published:2009/7/22 1:14:00 Author:Jessie

Achieves high carrier and modulation suppression by using closely matched diodes and providing R1 for amplitude adjustment and coaxial line for phase adjustment. R2 provides slight amplitude adjustment.-W. H.Ellis, Diode Quad Modulator Suppresses Carrier 65 Db, Electronics, 39:8, p 97.   (View)

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SIREN_WITH_MUTING

Published:2009/7/22 1:13:00 Author:Jessie

National LM389 array having three transistors and power opamp on same chip uses opamp as square-wave oscillator whose frequency is adjusted with R2B. One transistor is used in muting circuit to gate power amplifier on and off, while other two transistors form cross-coupled MVBR that controls rate of square-wave oscillator.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 4-33-4-37.   (View)

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CROWBAR_IGNITRON

Published:2009/7/21 22:03:00 Author:Jessie

Multimegawatt high-vacuum modulator tubes for large radars are protected during tests by circuit that is triggered by fault sensors. Total response time for firing ignitron crowbar is below 10 microsec.-T. E. Yingst, Circuits to Control and Protect High-Power Modulator Tubes, Eleatronics, 35:4, p 56-61.   (View)

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PRECOMPRESSION_SHAPER

Published:2009/7/21 22:03:00 Author:Jessie

Improves effective signal strength of SSB transmitter by shaping AF frequency response ahead of audio compressor. Low-noise FET preamp providing initial gain for high-impedance microphone is followed by low- and high-rolloff circuit giving 15-dB boost or roll off to frequencies centered at about 1 kHz.-J. J. Schultz, Adding dBs to the Audio Compressor, 73 Magazine, May 1974, p 21-23 and 25.   (View)

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Read_circuitry_of_paper_tape_reader_for_RTL

Published:2009/7/21 21:26:00 Author:Jessie

Read circuitry of paper-tape reader for RTL (courtesy Motorola Semiconductor Products Inc.).   (View)

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Enlarger_phototimer

Published:2009/7/21 21:36:00 Author:Jessie

Enlarger phototimer (courtesy General Electric Company).   (View)

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SOFT_CLIPPER

Published:2009/7/21 21:34:00 Author:Jessie

Used after audio compressor to improve effective signal strength of SSB transmitter. Soft clipping is achieved by driving diode pair through resistance. Clipper is followed by low-noise FET voltage amplifier having broadband flat frequency response. Output filter sharply attenuates signals above about 3 kHz.－J,J,Schultz, Adding das to the Audio Compressor,73 Magazine, May 1974,p21－23and 25.   (View)

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Basic_SCR_phase_control

Published:2009/7/21 21:31:00 Author:Jessie

This circuit shows a basic phase-control scheme using an SCR and relaxation oscillator. The capacitor is charged through the resistor until the breakover voltage of the trigger (an SBS in this case) is reached. The SBS then changes to the on-state, and the capacitor is discharged through the SCR gate. Turn-on of the SCR is accomplished with a short, high-current pulse. In addition to an SBS, commonly-used triggers are UJTs, PUTs, optically coupled thyristors (chapter 9), and SIDACs. Phase control is obtained by varying the RC time constant of the charging circuit so that the trigger turn-on occurs at varying phase angles within a controlled half cycle. With the values shown, the conduction angle can be varied from about 20°to 150°.   (View)

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