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Optical electronic doorbell 1
2014-11-18 07:45:29125The optical electronic doorbell circuit is composed of the power supply circuit and light and sound circuit, and it is shown in Figure 3-111. Power sup...
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TV_video_IF_amplifier_and_detector_using_two_8_pin_DIPs
2014-11-18 05:41:09178TV video IF amplifier and detector using two 8-pin DIPs．Powergain is as fallows∶60 dB at 45 MHz(pin 3 open), 56 dB at 58 MHz(pin 3 open)，61 dB at...
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TV_IF_amplifier_with_video_detector_and_sound_takeoff_using_
2014-11-18 03:48:26118TV IF amplifier with video detector and sound takeoff using dual-gate MOSFETs (courtesy Texas Instruments Incorporated)....
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TELEPHONE_SILENCER
2014-11-18 03:08:59151If you are busy and cannot answer or do not wish to answer your phone, this circuit will give a busy signal without you having to leave the phone off t...
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PRESET_PULSE_COUNTER
2014-11-18 02:40:22144Automatically controls lesion-producing ultrasonic radiation counting up to 99,999. Mechanical counter is actuated by thyratron V5, which is keyed by o...
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Electrical pump controlled circuit
2014-11-18 00:25:4695The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an o...
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900_MHz_BF_amplifier_using_a_3N225_dual_gate_MOSFET
2014-11-17 23:26:28148900 MHz BF amplifier using a 3N225 dual-gate MOSFET. Coils L1 and L2 consist of the leads of the 1 pF and 3 pF capacitors (courtesy Texas Instruments I...
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Electronic ERNIE Device Circuit
2014-11-17 23:14:07112The picture shows the electronic ERNIE device's specific circuit. The IC1 is CD4011 with two input ports and four NAND gates. And the NAND gate IC1-1, ...
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CCTV_RECEIVING_TERMINAL
2014-11-17 22:38:04145Used with repeater (not shown) that makes up for loss in last section of cable. Amplifier then raises level about 10 db. Selective negative feedback im...
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Direction_and_speed_control_for_series_wound_or_universal_mo
2014-11-17 22:06:10151In this circuit, Q1 through Q4 are triggered in diagonal pairs. The pair to be turned on is controlled by S1, which selects either T1 or T2 to receive ...
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PC electrically isolated RS485 interface (MAX487)
2014-11-17 18:15:46223This article describes the PC electrically isolated RS485 interface (MAX487). The principle is very simple, very practical. The circuit components can ...
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Boiler electronic descaling device circuit diagram 4
2014-11-17 17:49:06131The boiler electronic descaling device circuit is composed of the power supply circuit, 200kHz square wave oscillator, driver amplifier and the output ...
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HYDROGEN_THYRATRON_INDUCTION_HEATER
2014-11-17 15:18:00143Thyratron acts as high-speed switch, much like spark-gap oscillator, to produce damped oscillations in tank circuit L2-C2.Output frequency is 10 to 14 ...
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TEMPERATURE_COMPENSATED_MILLIVOLT_REFERENCE
2014-11-17 15:17:23142Two identical diodes are used to derive a temperature -compensated voltage across R2. Select two diodes of the same manufacture with, for example, 10-m...
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The bridge type T circuit of reducing the components of Notc
2014-11-17 14:12:49118The double-T circuit with less number of components achieves the notch filter circuitry, as well known as the T-bridge circuit, its application is few ...
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AUTOMATIC_BETA_CHECKER
2014-11-17 08:26:20164Holds collector current of test transistor Qx at preset value while base current is measured and bola de, termined.-E. P. Hojak, Automatic Measurement ...
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DC motor commutator circuit
2014-11-17 07:41:33221The important component of DC motor, and its functionis to transform the DC current to AC current in the coil ofelectric brush or transform the AC elec...
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CRYOGENIC_CONTACT_TESTER
2014-11-17 03:33:27162Measures critical current in superconducting contacts during periods shorter than 100 microsec in which such currents can be maintained, and gives osci...
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SHB6605 Power-Drive Integrated Circuit Diagram
2014-11-17 02:52:5877As a power driver IC, SHB6605 is widely used in air conditioners controlled by microcomputers, such as Changhong, Chinese style series air conditioners...
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SOUND_I_F_FOR_COLOR_TV
2014-11-17 01:33:14127Uses three transislor stages und Foster-Seeley discriminotor to give audio output of 1 v peak to peak. -D. Bray, Solid State Makes Debut in Big Screen ...
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Dual-output electronic ballast circuit diagram
2014-11-17 00:26:3178IC1, TR1, TR2, L1 form the switching power supply with output in 80V. One part of IC1 forms the 65kHz square wave oscillator to drive N-channel MOSFET-...
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E-anesthetic circuit diagram
2014-11-17 00:03:29169As shown is the electronic anesthesia circuit. The circuit can output 8 groups of electrode which output at the same time independently. Regulating any...
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AUTOMATIC_CHROMA_CONTROL
2014-11-16 23:23:13173Improves stability of hue, saturation, noise, and pull in characteristics of received color tv signals. Low-frequency diode gate corrects subcarrier os...
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FSK_GENERATOR_FOR_CASSETTE_DATA
2014-11-16 22:05:55141Uses two 565 PLL ICs, locked to 800-Hz system clock but oscillating at 6.4 kHz and 4.8 kHz, to provide FSK signals for recording digital data on ordina...
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Types of resistor connection used in electronic circuits
2014-11-16 22:01:1482Types of resistor connection used in electronic circuits is one of the most important thing that must be known by anyone who works (repair design, buil...
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Linear_TV_IF_amplifier_using_an_ECG_1080_chip
2014-11-16 21:45:39102Linear TV IF amplifier using an ECG 1080 chip, which provides 46 dB powergain. Transformer T is 0.32 mm enamel wire with a center-tapped primary of eig...
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EXPOSURE_TIMER
2014-11-16 21:30:21129Uses thyratron to stop relay chatter. Gives long time delays with relatively small capacitance. Ordinary volume control covers complete timing range. C...
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Full_range_ac_power_control
2014-11-16 18:40:56175This circuit shows a full-range ac control scheme that uses a triac and SBS. Control is obtained by varying the 100-k Ω pot. Notice thatRGK can be omi...
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TV_AFT_AFC_circuit_for_three_types_of_systems_using_an_ECG10
2014-11-16 16:35:32123TV 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 ...
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FERRITE_CUP_TUNER
2014-11-16 16:30:31188Rotary-axial tuner consists of two pairs of ferrite cups with ground D-shaped center cores, ganged to produce linear frequency variation from 500 to 1,...
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