We found this circuit in a 1973 documentation. The null adjustment trimpot is 10k. The circuit can be powered by symmetrical sources from 9 V. The diodes on the bridge can be 1N4148.
This circuit is used in analog-to-digital converters based on a voltage that is sampled and is...
This Baxandall tone control circuit is based on the JFET integrated circuit at the CA3140 input. The...
This simple circuit uses the speakers as microphones. The two-station circuit can be expanded to...