Electrical Equipment Circuit

THERMOELECTRIC_COOLING_CONTROL

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

Temperature inside cooling chamber is sensed by thermistor bridge and bridge output is com pared with temperature-setting reference voltage. Difference voltage is amplified and fed to current control circuit of thermoelectric converter.-M. Nagata and Z. Abe, Thermoelectric Elements for Circuit Cooling, Electronics, 34:41, p 54-55.   (View)

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Color_TV_chroma_processor_with_ACC_color_killer_and_an_injection_lock_reference_system

Published:2009/7/21 8:58:00 Author:Jessie

Color TV chroma processor with ACC, color killer, and an injection lock reference system. fypical power supply voltage is 9 to 11.5 volts. Hue control range is 100 degrees. The oscillator output signal is 180 mV PMS (courtesy GTE Sylvania Incorporated).   (View)

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TV_color_IF_amplifier_and_detector

Published:2009/7/21 8:56:00 Author:Jessie

TV color IF amplifier and detector. This configuration will provide approximately 84 dB voltage gain. The nominal 3-volt peak-to-peak output can be varied between 0 and 7 volts with excellent linearity and freedom from spurious output products. Alignment is most easily accomplished with an AM generator set at a carrier frequency of 45.75 MHz, modulated with a video frequency sweep. The detector tank is first adjusted for maximum detected DC witlra CW input. Next the video sweep modulation is applied in order to align the input and interstage circuits (courtesy GTE Sylvania Incorporated).   (View)

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TV_video_IF_amplifier_with_low_level_detector

Published:2009/7/21 8:55:00 Author:Jessie

TV video IF amplifier with low-level detector (courtesy Motorola Semiconductor Products Inc.).   (View)

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TV_video_IF_amplifier_with_detector_stage

Published:2009/7/21 8:53:00 Author:Jessie

TV video IF amplifier with detector stage (courtesy Motorola Semiconductor Products Inc.).   (View)

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TV_VHF_tuner_using_dual_gate_MOSFETs

Published:2009/7/21 8:52:00 Author:Jessie

TV VHF tuner using dual-gate MOSFETs (courtesy Texas Instruments Incorpo rated).   (View)

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AFT_circuit_for_TV_with_detailed_coil_winding_data

Published:2009/7/21 8:50:00 Author:Jessie

AFT circuit for TV with detailed coil winding data (courtesy GTE Sylvania Incor porated).   (View)

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TV_AFT_AFC_circuit_for_three_types_of_systems_using_an_ECG1046_14_pin_DIP

Published:2009/7/21 8:48:00 Author:Jessie

TV AFT/AFC circuit for three types of systems using an ECG1046 14-pin DIP. The ECG1046 contains two VIF differential amplifiers, a phase detector, and a DC amplifier, whose output is supplied to a varactor diode in a tuner. It has the additional feature of having an internal regulated voltage supply. Partial tuner circuits shown are only for example applications. Coils and transformers should be selected to match the IF and can be obtained from discarded TV receivers or purchased at a local electronics parts jobber (Merit or Miller components). Maximum supply voltage for the ECG1046 is 20 volts (courtesy GTE Sylvania Incorporated).   (View)

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Complete_TV_video_IF_amplifier_and_detector_system

Published:2009/7/21 8:45:00 Author:Jessie

Complete TV video IF amplifier and detector system. The ECG749 contains two lF amplifiers, an AGC keyer, and an AGC amplifier; The circuit will work for both color and B&W. See table for AGC information (courtesy GTE Sylvania Incorporated).   (View)

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Electrono_tuner_contror_memory_for_radio_and_TV

Published:2009/7/21 8:43:00 Author:Jessie

Electrono tuner contror/memory for radio and TV. The SH1549 gives capability of storing and recalling up to 16stations in addition to conventional varactor tuning. The SH 1549 converts the analog tuning voltage into a 12-bit digital word and stores it in memory for future use (courtesy Fairchild Semiconductor).   (View)

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ColorTV_horizontal_self_regulating_scan_circuitry_fora_19_inch_receiver

Published:2009/7/21 8:33:00 Author:Jessie

ColorTV horizontal self-regulating scan circuitry fora 19-inch receiver (courtesy Motorola Semiconductor Products Inc.).   (View)

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_Color_TV_chroma_processor_using_an_ECG1089_20_pin_DIP

Published:2009/7/21 7:51:00 Author:Jessie

Color TV chroma processor using an ECG1089 20-pin DIP. The ECG1048 noted on the schematic is a chroma demodulator The ECG703A is a 3.58 MHz amplifier(courtesy GTE Sylvania Incorporated)   (View)

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Color_TV_358_MHz_crystal_oscillator_using_adual_gate_MOSFET

Published:2009/7/21 7:47:00 Author:Jessie

Color TV 3.58 MHz crystal oscillator using adual-gate MOSFET (courtesy Texas Instruments Incorporated).   (View)

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TV_vertical_deflection_system

Published:2009/7/21 7:46:00 Author:Jessie

TV vertical deflection system (courtesy GTE Sylvania Incorporated).   (View)

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PULSER_FOR_250_KW_MODULATOR

Published:2009/7/21 7:59:00 Author:Jessie

Trigger generator for scr modulator uses, two-layer and four-layer diodes to provide pulse burst, repetition rates up to 25 kc.-H.G. Heard, Controlled Rectifier Produces Quarter-Megatwatt Pulse Power, Electronics, 34:25, P 54-55.   (View)

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Complete_FM_TV_45_MHz_sound_channel_using_an_ECG1045_14_pin_DIP

Published:2009/7/21 7:57:00 Author:Jessie

Complete FM/TV 4.5 MHz sound channel using an ECG1045 14-pin DIP. Audio power output is 1.5 watts. The ECG1045 contains a three-state high-gain directional IF amplifier and a ratio detector. IF transformers and the AF output transformer are standard items and can be purchased at Radio Shack. This circuit can be modified for 10.7 MHz operation by selecting the proper IF transformers (courtesy GTE Sylvania Incorporated).   (View)

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ColorTV_demodulator_with_color_amplifiers

Published:2009/7/21 7:54:00 Author:Jessie

Color TV demodulator with color amplifiers. The ECG1131s shown are chroma signal amplifiers. The ECG1130 is a 16-pin DIP (courtesy GTE Sylvania Incorporated).   (View)

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Varactor_UHF_TV_tuner_using_a_3N225_dua_gate_MOSFET

Published:2009/7/21 8:30:00 Author:Jessie

Varactor UHF TV tuner using a 3N225 dua-gate MOSFET(courtesy Texas Instruments Incorporated).   (View)

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TV_IF_amplifier_with_video_detector_and_sound_takeoff_using_dual_gate_MOSFETs

Published:2009/7/21 8:29:00 Author:Jessie

TV IF amplifier with video detector and sound takeoff using dual-gate MOSFETs (courtesy Texas Instruments Incorporated).   (View)

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TV_IF_amplifier_uslng_dual

Published:2009/7/21 8:27:00 Author:Jessie

TV IF amplifier uslng dual－gate MOSFETs The IF response is as follows∶39.75 MHz greater than 30 dB down， 41.25 MHz greater than 40 dBdown，47.25 MHz greater than 30 dB down，42.17 nealy 8 dB down，45.75 MHz equalto 6 dB down．Senstivity is 700 μV for 1V of video carrier at 100% modulation．AGC range is 43 dB AGC voltage is ＋4.0 V to－6.0V．Sound output is 570μV of 4.5 MHz signal(courtesy Texas Instruments Incorporated).   (View)

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