Car alarm (CB23933E)

We found this circuit in Radio Electronics from October 1968. The circuit drives headlight bulbs and can be adapted for current applications.

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Null Detector (CB11550E)
We found this circuit in the Texas Instruments' Linear Circuits Applications. It uses an...
Temperature control (CB13009E)
With the circuit in the figure, it is possible to control the amount of heat generated by the...
Simple VHF Receiver (CB19598E)
This VHF receiver with three transistors and loudspeaker listening was found in European...