This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the hard-to-obtain component of our day. It is for reference only.
This transistor gain meter was found in a 1960 Sylvania transistor manual. The circuit is for...
This circuit for monitoring telegraphy transmissions was found in a 1975 CQ magazine. Transistors may be...
This is the version of the previous circuit with shadow activation. The circuit can use relays from...