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.
This circuit adds an amplifying transistor that can supply loads of up to 250 mA. The circuit is...
This circuit is from GE technical documentation from the 1970s. The circuit can be implemented with SCRs...
This circuit was obtained in a Popular Electronics of the 90s. It warns when the indicator lamp is...