Found in a Popular Electronics from the 90's, this circuit is used to recognize the frequency of a modulated infrared signal. The LM567 circuit must not be supplied with voltages above 9 V.
We found this circuit in a technical documentation from the 70's. Any double-gate MOSFET can be...
We found this thyristor power supply in a 1987 documentation. It uses common SCRs as rectifiers and...
This simple circuit has its trigger point set in the trimpot. The transistor can be any general...