We found this circuit in a 1996 publication. Equivalent components can be tried, especially in the case of the photodiode. The circuit is powered by a 12 V source.
This circuit is designed to activate an automotive alarm after 8 minutes of activation. Of course...
This circuit consists of a simplified Hartley oscillator that changes the frequency according to...
Integrated circuits 8038 and 8063 are not common today. This circuit, found in the 1983 Intersil...