Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to obtain now as it is of the era. The circuit is intended for FI ceramic filter circuits.
We found this circuit from a commercial megaphone in a Japanese publication in 1967. The circuit is...
This circuit is from an old operating manual and can be implemented with operationals types that...
This circuit was originally created to increase the power of car radios of the 790s and 80s that...