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．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 dual-gate MOSFETs (courtesy Texas Instruments Incorporated)....
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...
Automatically controls lesion-producing ultrasonic radiation counting up to 99,999. Mechanical counter is actuated by thyratron V5, which is keyed by o...
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. Coils L1 and L2 consist of the leads of the 1 pF and 3 pF capacitors (courtesy Texas Instruments I...
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, ...
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...
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 ...
This article describes the PC electrically isolated RS485 interface (MAX487). The principle is very simple, very practical. The circuit components can ...
The boiler electronic descaling device circuit is composed of the power supply circuit, 200kHz square wave oscillator, driver amplifier and the output ...
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 ...
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 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 ...
Holds collector current of test transistor Qx at preset value while base current is measured and bola de, termined.-E. P. Hojak, Automatic Measurement ...
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...
Measures critical current in superconducting contacts during periods shorter than 100 microsec in which such currents can be maintained, and gives osci...
As a power driver IC, SHB6605 is widely used in air conditioners controlled by microcomputers, such as Changhong, Chinese style series air conditioners...
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 ...
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-...
As shown is the electronic anesthesia circuit. The circuit can output 8 groups of electrode which output at the same time independently. Regulating any...
Improves stability of hue, saturation, noise, and pull in characteristics of received color tv signals. Low-frequency diode gate corrects subcarrier os...
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 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, which provides 46 dB powergain. Transformer T is 0.32 mm enamel wire with a center-tapped primary of eig...
Uses thyratron to stop relay chatter. Gives long time delays with relatively small capacitance. Ordinary volume control covers complete timing range. C...
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 ECG1046 14-pin DIP. The ECG1046 contains two VIF differential amplifiers, a phase detector, and ...
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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