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.
This source allows the supply of laser diodes with voltages above 11 V. The circuit is from French...
This circuit uses an 18 MHz crystal to generate 36 MHz signals. We found it in an 80's...
This circuit monitors the current in the negative line. The circuit is from a 2005 Linear...