The HV2405E integrated circuit is not very common these days. This circuit was found in the August 1998 issue of Electronics Now magazine. The current is a few tens of milliamps.
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
This traditional configuration of bandpass or bandpass filter with operational 741 was found in a...
With 3 flip-flops (which correspond to 1 integrated and a half) we can also make a divider by 8,...