Reverse polarity protection 2 (CB22140E)

This circuit has an improvement over the previous one as it also has an LED indicator for correct polarity.

Optical direction discriminator (CB8079E)
Found in American documentation from the 90s, this configuration detects the direction of rotation...
Voltage Amplifier (CB21857E)
This amplifier with a 9 MHz passband and 10 voltage gain with two transistors was found in...
Inverter Schmitt Trigger 4093 (CB16083E)
A Schmitt trigger inverter can be obtained from each gate of the 4093 with the connection shown in the...