We found this circuit in a 1977 factory documentation. The operational amplifiers can be 741 and the symmetrical power supply. Capacitors can be changed for operation at other frequencies.
This circuit tests rectifier diodes with currents from 200 mA to 450 mA, thus serving to test...
This circuit generates a 1296 MHz signal from 100 or 1,000 kHz crystals. We found it in an...
This preamplifier with RIAA equalization was obtained in a documentation from the 1980s. The...