This 2000’s circuit causes LEDs to flash sequentially from programming on an 80C51 microcontroller. The circuit has an additional TTL and must be powered by a 5 V power source.
This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according...
For the 400 to 500 MHz bands, this circuitry found in an 80's documentation uses a very critical...
This amplifier for FM antenna signals was published in Radio Electronics magazine in May 1963....