This circuit was found in the June 1986 issue of Radio Electronics magazine. It is based on two operational CA3140s and has a trigger voltage adjustment.
This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered...
This circuit is suitable for the calibration of old analog oscilloscopes. It was found in...
This is the circuit of a hearing aid amplifier manufactured by Sony in the 1960s. The circuit was...