This circuit is from the 1989 special edition of Radio Electronics Experimenter. The circuit was created with SMD components to be mounted on a keychain.
The resistor values depend on the desired gain and the full scale of the indicator instrument. The power...
This low frequency oscillator with an operational amplifier of type 741 has adjustment of the mark...
This 3 + 3 V symmetrical source circuit uses an old operational amplifier. The circuit is from an...