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 simple amplifier stage with a transistor has a linear response from 25 Hz to 120 kHz. The...
The output transistors can be the TIP41 and the BD135 and BD136 drivers. TR1 can be a BC558 and...
The general-purpose thermostat shown in the figure uses a high-resistive thermistor as a sensor....