General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
This amplification stage circuit with a germanium transistor was found in a 1980s documentation. The...
This circuit was originally used in a 1989 documentation presence simulator. The circuit activates...
This circuit is from a Popular Electronics from July 1990. The magazine no longer exists, but the...