The use of field effect transistors in this circuit improves its performance. This configuration is from a 1975 circuit manual. The transistor can be any general-purpose FET such as MPF102 or BF245.
The purpose of this circuit is to add millivolt scales to a common multimeter. Used transistors are...
For someone who wants to take advantage of a double transformer in a good power supply, we found...
This circuit can either generate signals in the astable form or be synchronized externally,...