Microammeter (T465E)

Found in a 1948 MIT documentation, this circuit uses a 0 to 100 uA microammeter as an indicator. The power supply is 150 V.

JFET Touch Shield (CB19559E)
This circuit can be used as a shield for touch control. The circuit can use any common FET like...
Darlington PNP Photo Trigger (CB14661E)
This circuit was found in a Texas optoelectronic manual. Observe the polarity of the supply. Other...
Low resistance adapter (CB7390E)
Found in a Hands On Electronics from the 80's this circuit allows the reading of low resistances in...