This power supply has a resolution of 10 pA in the current range from -100 to +100 nA. The circuit is from a 90s Electronic Design operating with voltages from -4 to +3.5 V.
Critical components of this project are the Geiger tube and the 300V battery. The battery can be...
The instrument is a common multimeter on the lower voltage scale. The FET can be BF245 or MPF102. The...
Suggested by National Semiconductor in a documentation of the 90s, this circuit uses a power...