This circuit was found ina 90s Popular Electronics. It is intended for switching analog video signals, indicated components that are still common today.
The figure shows how to measure current with a 3 ½ digit 7107 meter described in Electronics Now...
I found this electronic organ in magazine published in 1976 from my vast collection of foreign...
The presented circuit uses the National Semiconductor's LM3909, an oscillator that operates with...