We found this circuit in the September 1995 issue of Electronics Now magazine. The circuit has 6 scales for resistance measurements and uses an analog indicator from 50 uA to 1 mA.
When the voltage exceeds the value given by the zener, this circuit from a 1990 documentation...
In the figures we have an infrared transmitter with a BC337 switching transistor that must be...
This circuit was found in Motorola documentation from 1969. The transistors are from that time. The...