We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs operating with both low continuous voltage and high alternating voltage.
This circuit was suggested by Radio Electronics magazine in September 1983 in the new ideas...
We found this amplifier with high input impedance and low capacitance, using FET, in a...
This powerful pushbutton uses a power MOSFET. We found it in a Popular Electronics magazine from...