This circuit uses currently uncommon components, including the 10.7 MHz (FI) filter. This circuit was found in Motorola's 1990 Linear Databook.
With this circuit it is possible to compare the gain of transistors to obtain a matched pair (of...
This circuit was found in an English magazine from 1978, but it can be easily assembled today,...
This circuit is from the Philips manual of 1990. The integrated circuit is not very common. The...