This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V source and the displays are of common cathode.
This simple 15 V power supply was found in an article describing an assembly in the January 1987...
This VHF receptor was found in a Japanese publication from the 1960s. The original transistors can be...
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...