This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated circuit, uncommon nowadays, can be replaced by an equivalent. The power supply must be symmetrical.
This simple circuit tests electrolytic capacitors from 1 uF with a working voltage above 12 V. The...
This circuit, with a configuration like to many that we can find in this section, was suggested by a...
Signals from old cordless phones can be picked up with this circuit. L1 has 10 to 20 turns of 32...