We found this circuit in the March 1980 Radio Electronics magazine. The circuit used is the HA2400 released at the time. The power supply must be symmetrical.
This didactic circuit was found in a 2001 documentation. It presents the result of programming in binary...
The purpose of this circuit is to find two resistors with very close values for critical...
This circuit was found in old documentation. Transistors can be BC548. The LEDs are the same....