Fuel Gauge (CB26016E)

This automotive circuit was found in the June 1997 issue of Electronis now magazine. The circuit uses a common operational amplifier powered by 12 V.

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Fuzz effect (CB4871E)
This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549...
Reversal polarity protector (CB21581E)
This circuit provides reverse power polarity protection using a power MOSFET and a diode. The...
Power Outage Alarm (CB5952E)
We found this circuit very simple in an old documentation. The relay is high voltage sensitive, but...