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  • Optical electronic doorbell 1

    2014-11-18 07:45:29138

    The 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...

  • TV_video_IF_amplifier_and_detector_using_two_8_pin_DIPs

    2014-11-18 05:41:09193

    TV 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...

  • TV_IF_amplifier_with_video_detector_and_sound_takeoff_using_

    2014-11-18 03:48:26123

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

  • TELEPHONE_SILENCER

    2014-11-18 03:08:59171

    If 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...

  • PRESET_PULSE_COUNTER

    2014-11-18 02:40:22155

    Automatically controls lesion-producing ultrasonic radiation counting up to 99,999. Mechanical counter is actuated by thyratron V5, which is keyed by o...

  • Electrical pump controlled circuit

    2014-11-18 00:25:46100

    The 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...

  • 900_MHz_BF_amplifier_using_a_3N225_dual_gate_MOSFET

    2014-11-17 23:26:28162

    900 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...

  • Electronic ERNIE Device Circuit

    2014-11-17 23:14:07119

    The 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, ...

  • CCTV_RECEIVING_TERMINAL

    2014-11-17 22:38:04163

    Used 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...

  • Direction_and_speed_control_for_series_wound_or_universal_mo

    2014-11-17 22:06:10170

    In 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 ...

  • PC electrically isolated RS485 interface (MAX487)

    2014-11-17 18:15:46279

    This article describes the PC electrically isolated RS485 interface (MAX487). The principle is very simple, very practical. The circuit components can ...

  • Boiler electronic descaling device circuit diagram 4

    2014-11-17 17:49:06147

    The boiler electronic descaling device circuit is composed of the power supply circuit, 200kHz square wave oscillator, driver amplifier and the output ...

  • HYDROGEN_THYRATRON_INDUCTION_HEATER

    2014-11-17 15:18:00177

    Thyratron 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 ...

  • TEMPERATURE_COMPENSATED_MILLIVOLT_REFERENCE

    2014-11-17 15:17:23154

    Two identical diodes are used to derive a temperature -compensated voltage across R2. Select two diodes of the same manufacture with, for example, 10-m...

  • The bridge type T circuit of reducing the components of Notc

    2014-11-17 14:12:49128

    The 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 ...

  • AUTOMATIC_BETA_CHECKER

    2014-11-17 08:26:20179

    Holds collector current of test transistor Qx at preset value while base current is measured and bola de, termined.-E. P. Hojak, Automatic Measurement ...

  • DC motor commutator circuit

    2014-11-17 07:41:33237

    The 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...

  • CRYOGENIC_CONTACT_TESTER

    2014-11-17 03:33:27174

    Measures critical current in superconducting contacts during periods shorter than 100 microsec in which such currents can be maintained, and gives osci...

  • SHB6605 Power-Drive Integrated Circuit Diagram

    2014-11-17 02:52:5887

    As a power driver IC, SHB6605 is widely used in air conditioners controlled by microcomputers, such as Changhong, Chinese style series air conditioners...

  • SOUND_I_F_FOR_COLOR_TV

    2014-11-17 01:33:14137

    Uses 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 ...

  • Dual-output electronic ballast circuit diagram

    2014-11-17 00:26:3178

    IC1, 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-...

  • E-anesthetic circuit diagram

    2014-11-17 00:03:29189

    As shown is the electronic anesthesia circuit. The circuit can output 8 groups of electrode which output at the same time independently. Regulating any...

  • AUTOMATIC_CHROMA_CONTROL

    2014-11-16 23:23:13189

    Improves stability of hue, saturation, noise, and pull in characteristics of received color tv signals. Low-frequency diode gate corrects subcarrier os...

  • FSK_GENERATOR_FOR_CASSETTE_DATA

    2014-11-16 22:05:55157

    Uses 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...

  • Types of resistor connection used in electronic circuits

    2014-11-16 22:01:1487

    Types 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...

  • Linear_TV_IF_amplifier_using_an_ECG_1080_chip

    2014-11-16 21:45:39109

    Linear 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...

  • EXPOSURE_TIMER

    2014-11-16 21:30:21138

    Uses thyratron to stop relay chatter. Gives long time delays with relatively small capacitance. Ordinary volume control covers complete timing range. C...

  • Full_range_ac_power_control

    2014-11-16 18:40:56201

    This 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...

  • TV_AFT_AFC_circuit_for_three_types_of_systems_using_an_ECG10

    2014-11-16 16:35:32130

    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 ...

  • FERRITE_CUP_TUNER

    2014-11-16 16:30:31199

    Rotary-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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