This circuit, which can be used as a shield, was found in American documentation from the 1970s. This configuration appears elsewhere in this section from other sources.
We found this circuit in the November 1992 Radio Electronics magazine. The circuit uses an LDR as a...
This circuit was found in the February 1993 Radio Electronics magazine. The frequency depends on...
This circuit is from a 1966 General Electric documentation. The circuit applies to sensitive SCRs for...