Found in the February 1983 Radio Electronics magazine, this circuit uses a FET and has good gain at the frequencies determined by the components. The FET is any general-purpose FET.
This circuit was obtained from a Popular Electronics of 1994. The magazine no longer exists in its...
This circuit is from Motorola documentation on 1976 power devices. SCRs are powered according to...
This latching alarm using SCR was found in a Popular Electronics from 1992. The circuit triggers a...