We found this circuit in a 1967’s Electronics World. The circuit can be made with modern equivalent transistors. The selection is made by the tuned coil.
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...