The output transistors can be BC548 and BC558. The circuit is from a 1975 documentation showing a frequency response from 90 Hz to 12.5 kHz.
This simple pole search or neon probe for the 110 V or 220 V power grid has nothing unusual, being...
This transmitter was found in an old publication on espionage. It applies a signal of a few...
Maxim MAX20056B 6 Channel High Brightness LED Controller Maxim Integrated makes available through...