This TTL sequential flasher circuit was found in the January 1981 issue of Radio Electronics magazine. It is powered by 5 V. The frequency can be adjusted by R1.
This automotive tachometer circuit uses a FET and a 1 mA full-scale instrument. We found it in the...
This amplifier with very high input resistance has variable gain and must be powered by a...
This experimental receiver for the medium wave band uses a germanium transistor that can be...