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 circuit was found in December 1983 Radio Electronics magazine. The maximum output current is 1 A...
This TTL circuit for PC was found in an English documentation from 1992. The integrated circuit used...
This small two-transistor amplifier was found in the April 1994 issue of Electronics Now magazine. This...