This commercial radio with 3 earphone listening transistors was manufactured in Japan in the 1960s. The medium-wave circuit uses germanium transistors and is powered by a 9 V battery.
This isolated shield uses a common optical coupler that supports several equivalents. The resistor in...
This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset...
Suggested for use in cars and motorcycles, this circuit was found in a 90s Popular Electronics. The...