Based on a PLL 567, this circuit serves as a receiver for the CB9574E circuit. S tuning is done in R1 and it is used for frequency modulated signals.
This circuit is from 1950, from the time when some still called the crystal triode transistor. The circuit is...
In the circuit shown in the figure, when the input voltage rises to 27 V, the TL431 triggers the...
This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical...