VU Meter

LED VU Meter

Although there are several ICs on the market with which it is quite simple to construct an LED VU meter, there is, no doubt, still interest in building such a meter from discrete components. The meter shown in the diagram is based on eight opamps, contained in two Type LM324 chips, which function as comparators.[…]

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PC fan control Circuit

PC fan control Circuit

It is an unfortunate and well-known fact that most PCs of IBM and compatible type make a lot of noise. which is both undesirable lots of noise in the both undesirable (as regards noise in the working environment) and unnecessary (as regards the actual power consumptions. which is often quite low ), many fans in[…]

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Solid State

Solid State Voice Recorder

Integrated circuits ISD 1012, ISD 1016 and ISD 1020 from chip maker ISD enable sounds to be recorded and played back. The final two digits in type coding show the length of a sound message in seconds. The difference in recording and playback is caused by the sampling frequency. which is highest (10.6 kHz) for[…]

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PW_FrontView

Crowbar Protection

Quite a few electronic components. particularly active ones. cannot withstand too high voltages. Preventing costly circuits dying a premature death because the supply voltage has risen too high makes overvoltage protector no luxury. Such a protector must, of course, act swiftly, otherwise, the deed has been done before it had a chance to act. Therefore.[…]

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