555 Timer Police Siren Circuit

admin June 11, 2010 5 Comments
Circuit Description Police siren circuit given here is a circuit based on NE 555 timer IC. This circuit uses two NE 555 ICs (IC1 and IC2) and which are the core working parts of this circuit. Here two timer...
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Voltage Doubler Circuit

admin June 10, 2010 1 Comment
Circuit Description The circuit diagram given here is a simple voltage doubler circuit. In this circuit the central part is the timer IC NE 555. This circuit also includes two transistors Q1 (BC 107) and Q2 (BC 177) as...
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3-Phase Auto Changer Circuit

admin June 10, 2010 3 Comments
Circuit Description The circuit given here is a three phase auto charger circuit. Any modern electrical or electronic device can operate from 230 V ac supply with 15% tolerance in voltage. That is the device will work normally for...
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Capacitance Meter Circuit

admin June 2, 2010 4 Comments
Circuit Description The circuit diagram of simple capacitance meter has been published here. The core part of this circuit is the frequency to voltage converter IC LM 2917 developed by National Semiconductors. This IC LM 2917 is a monolithic...
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Light Activated Switch

admin June 1, 2010 1 Comment
Circuit Description The circuit diagram of light activated switch circuit has been described here. The core part of this circuit is the operational amplifier IC LM 311which acts as a voltage comparator here. This circuit also consists of an...
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Simple Function Generator Circuit

admin May 31, 2010 1 Comment
Circuit Description Here is the circuit diagram of common function generator circuit. The central part of this circuit is the function generator IC ICL 8038. This function generator IC can generate waveforms such as sine, square and triangular at...
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Simple Battery Monitor Circuit

admin May 31, 2010 1 Comment
Circuit Description Here is the circuit diagram of simple battery monitor circuit. The main part of this circuit are the IC MN13811G from Panasonic and an efficient flasher circuit based on transistors Q1 (BC 558) and Q2 (BC 548). This...
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Window Foil Burglar Alarm Circuit

admin May 30, 2010 4 Comments
Circuit Description The circuit diagram of window foil burglar alarm has been published here. The main parts of this circuit are SCR H1 (TYN 612) and transistor Q1 (BC 107). This burglar alarm can be fitted in windows to...
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Simple Tweeter Crossover Circuit

admin May 30, 2010 1 Comment
Circuit Description The circuit diagram of tweeter crossover circuit has been described here. The advantage of this circuit over circuits of single coil speaker is that it can handle both high and low frequency signals simultaneously. A tweeter circuit...
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