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.
The circuit shown serves as a direction indicator or arrow for bicycles, robots and other...
This circuit was found in an 1888 publication. However, since it uses common components, it can...
Featuring low output impedance and high input impedance, this configuration was found in a 1980s...