This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of Electronics Now magazine. A common bipolar with a 1k resistor at the base can be used in place of the FET.
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
In the figure we have a configuration that allows to test NPN transistors and with the addition of a...
We find this current meter circuit from 0 nA to 200 nA in a Linear Technology application manual....