The figure shows a remote-control receiver working the 27 MHz band, very popular in the 60’s. The circuit us from a February 1961 Radio Electronics magazine.
Found in a 1980’s documentation, this circuit must have its signal applied to an amplifier stage. The...
We show only one of the channels of an excellent audio preamplifier with the LM382 integrated...
This circuit is from 1983 documentation. The author shows us an experimental circuit of a siren...