We show an oscillator that produces rectangular TTL signals based on inverters. Inverters can also be designed with standard NOR or NAND gates. The circuit must be powered by 5 V.
This interesting sensor for RF signals was found in an article in the June 1989 Radio Electronics...
This high quality audio preamplifier uses three bipolar transistor and is powered from 24 V...
This series and parallel sensor circuit was found in Popular Electronics from the 1990s. Any SCR...