This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit indicator ICs CA3161 and CA3162.
In this amplifier, the supply voltage is 35 V and the input resistance is 2k2. Equivalent...
This high speed laser diode driver was found in a 1980s documentation. Power FETs can be replaced...
This instrumentation amplifier with differential inputs was found in documentation from the 90s....