We found this precision circuit in a manual from the 80's. The operational amplifier is of a common type at the time, and equivalents can be tested. Transistors are general purpose types.
This bistable with transconductance operational amplifier was found in early National...
This circuit can be used as a control shield for microcontrollers of all types. The supply is made...
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...