This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or equivalent. We found this configuration in a documentation from the 70s.
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...