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Alcohol Detector Meter Circuit using MQ-3 Sensor Module

MQ-3 sensor LM393 comparator circuit

The simple alcohol detector circuit discussed here will accurately sense the emanation of alcohol gas from a selected source, such as from the mouth of a drunkard, when used as a breathalyzer. It’s cheap and a useful device which can be used by all authorized personnel such as a cops or traffic police for nabbing drunken … Read moreAlcohol Detector Meter Circuit using MQ-3 Sensor Module

Use this Capacitor Tester to Find Leaky Capacitors Quickly

capacitor tester circuit

This simple capacitor tester is capable of testing electrolytic capacitors in the range of 1uf to 450uf. It can test large start and run capacitors as well as 1uf miniature capacitors rated at 10v. Once you understand the timing cycle, you can test down to 0.5uf and up to 650uf. By Henry Bowman How to … Read moreUse this Capacitor Tester to Find Leaky Capacitors Quickly

How to Make a Simple Milliohm Tester Circuit

milliohm meter tester circuit

I wanted a milliohm tester circuit that could be used to measure resistance on printed circuit boards to track down shorted components. I looked at several designs and combined several ideas into this project. By Henry Bowman Circuit Operation Referring to the schematic, the milliohm tester is powered by two 9 volt dry cells. The … Read moreHow to Make a Simple Milliohm Tester Circuit

Simple MOSFET Tester and Sorter Circuit

This simple MOSFET tester does a quick job of testing both enhanced mode type N and P-channel mosfets. It checks for shorts between gate, drain and source. Designed By: Henry Bowman It also distinguishes between N and P-channel mosfets. Once the connections are correctly made to the mosfet, all testing is done without reversing connections. … Read moreSimple MOSFET Tester and Sorter Circuit

Simple Transistor Diode Tester Circuit

simple IC 555 based transistor tester circuit

In this post we learn how to make a simple yet efficient transistor/diode tester circuit, that will not only test the quality of a BJT, but will also help to identify whether it is is an NPN or a PNP. The circuit was designed and contributed by Mr. Henry Bowman. Circuit Operation Referring to the … Read moreSimple Transistor Diode Tester Circuit

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