This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm speaker. The circuit is from an 80's documentation.
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...