This circuit was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads. It can also be used for other purposes.
We found this circuit in a Radio Electronics magazine from January 1975. The transistors are...
This circuit was found in an American publication in 1967. The circuit uses an operational device of the...
A frequency divider for digital signals can be constructed based on a single 4018 integrated...