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.
According to the 1990 documentation in which we found this circuit, the chickens must be fed at...
Although the integrated used originally is uncommon today, more modern operating equivalents can...
This circuit was found in a General Electric documentation from 1965. The purpose of this circuit is...