This amplifier with two FETs in direct coupling (cascode) was found in a 90s Popular Electronics. The MOSFET can be of almost any type like the MPF102.
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...
This circuit was found in RCA and General Electric documentation from the 1980s. The circuit has...
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...