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 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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Simple 7-Segment Counter Circuit

admin May 27, 2010 3 Comments
Circuit Description The circuit diagram of 7 segment counter circuit has been published here. This circuit consists of counter IC CD 4033 as its central part, timer IC NE 555 and 7 segment display LT 543. In this circuit,...
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Simple Lamp Flasher Circuit

admin May 26, 2010 No Comments
Circuit Description Here is the circuit diagram of Lamp Flasher using NE 555. As the name says the heart of this circuit is the timer IC NE 555. This circuit is operating from 230V AC mains. In this circuit,...
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LED Based Car Battery Voltmeter

admin May 25, 2010 2 Comments
Circuit Description Here is a simple car battery voltmeter circuit using LEDs that can be easily installed in cars. This circuit consists of four LEDs and a quad operational amplifier IC LM 324 as its main part. This circuit...
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Simple Metal Detector Circuit

admin May 25, 2010 3 Comments
Circuit Description The circuit diagram of cost effective metal detector has been published here. This circuit and an old pocket radio constitute a simple metal detector device. This circuit is a Colpits oscillator circuit is operating at medium frequency...
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