This 1 kHz circuit was found in American documentation from the 90s. The original operational amplifier consists of a double 741 at the time. The power supply must be symmetrical.
Figure bellow shows how the 4510, a divide-by-1U, up/down counter with three-state outputs is...
This circuit was obtained from the Radio Electronics magazine of April 1991. The circuit is based...
This digital signal attenuator was found in a 90s Electronic Design. The circuit operates at...