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 another configuration of inverter amplifier with gain 20 (in fact 19),...
This circuit, which we find in a documentation from the 70s, filters out the Ru [occurring in...
This is a voltage regulator circuit for currents up to 1.5 A with an output voltage adjustment for outputs...