Using the LM170 integrated circuit, this circuit was found in the May 1970 Radio Electronics magazine. The transistor is general-purpose, and the potentiometer adjusts the gain.
This circuit uses two oscillators to produce a sound that seems the sound of a ring-bell. The...
This circuit is used for remote current monitoring. In the original version of the 80s a lamp is...
We found this circuit in an old oscilloscope publication. With it, it is possible to observe the B...