B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
This transistor flasher was found in an English magazine that no longer exists from 1975. The...
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
The maximum input voltage of this circuit is 20V and the output current is 250 mA. The circuit is from...