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 transmitter was found in a 1993 documentation, but it can be assembled with operators like...
This transistor tester was found in a 1980 publication. The transistor can be the BC548 and the...
This circuit is from an Electronics Now from the 90s. The circuit uses a power integrated circuit...