This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
This circuit uses an operational amplifier that is uncommon today, but it can be implemented with...
This simple circuit operates with only 1.5 volts of a battery and detects low resistance making a...
This circuit was found in a 1968’s Motorola documentation. The transistor is from that time. The...