This circuit was found in a Radio Electronics magazine from October 1987. It can be used as a shield for incandescent and heating elements.
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....