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.
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...
This circuit was found in documentation from the 90s, using components from that time. The...
This circuit, obtained from old documentation, allows the recovery of sulfated batteries. The...