This is a simple circuit that activates an alarm when there is a knock on the door or there are any vibrations due to...
Tuesday, December 30, 2014
Monday, December 29, 2014
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Speed Controller for Small Cooling Fans
Small cooling fans are used in some equipment for cooling semiconductor devices. The circuit given here is of a simple automatic speed controller for...
Friday, December 26, 2014
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TDA1562Q 54 W Amplifier Circuit Diagram
This is the simple Using TDA1562Q 54 W Amplifier Circuit Diagram. The integrated output amplifier described in this article consists of little more than...
Wednesday, December 24, 2014
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Battery-Discharge Measurement Circuit Diagram
Battery-life measurement for a portable system is a time-consuming task and many methods used for it do not give reliable results. Presented here is...
Sunday, December 21, 2014
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AM transmitter using Integrated Circuit
Many beginners give up playing with RF due to the difficulty of building coils and problems with self oscillations that are common in many...
Tuesday, December 16, 2014
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Monitor for 6V/12V Batteries
Rechargeable batteries of 6V and 12V are used in a large number of applications. It is imperative that these are maintained properly to get...
Sunday, December 14, 2014
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Electronical High Frequency Oscillator Circuit Diagram
This is the simple Electronical High Frequency Oscillator Circuit Diagram. Intended primarily as a building block for a QRI`transmitter, this 20-MHz oscillator delivered a...
Wednesday, December 10, 2014
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Simple Two 555 Timers Bell Circuit Diagram
This is the Simple Two 555 Timers Bell Circuit Diagram. This simple scheme uses two Bell 555 timer. The frequency controlled capacitors, which should...
Tuesday, December 9, 2014
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Simple Ac line Voltage Announcer Circuit Diagram
This is the Simple Ac line Voltage Announcer Circuit Diagram. The range of this simple ac-voltage monitor is 100 to 140 Vac, with a...
Sunday, December 7, 2014
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Simple Stethoscope Circuit Diagram
The stethoscope is a medical or veterinary use tool, in which the professional can hear the heartbeat, breath or other bodily sound of his...
Saturday, December 6, 2014
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Monitor and Protection Alarm Over Current Circuit Diagram
The electronic circuit described in this article's main function remote monitoring of power consumption (over current) in a domestic mains alternating current. This monitoring...
Friday, December 5, 2014
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MAX231 RS-232C LED Circuit Diagram
This is the simple MAX231 RS-232C LED Circuit Diagram. Use a pair of Maxim`s 5V-powered MAX231 RS-232C transmitters as drivers to obtain a 2-color...
Thursday, December 4, 2014
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Simple Power-Saving Relay Driver Circuit Diagram
This is the Simple Power-Saving Relay Driver Circuit Diagram.In many circuits, the switching action is performed by a relay, which in turn activates an...
Monday, December 1, 2014
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Nicad Battery Tester Circuit Diagram
This is the simple Nicad Battery Tester Circuit Diagram.This battery tester produces Nicad battery test at a speed of 500 mA. When an endpoint...
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