This circuit was found in a 90s Radio Electronics. MOSFETs must have excellent heat sinks and heat and the board layout carefully planned to withstand high currents.
This alarm, from a 1996 magazine, can be fitted with two BC548s in the original configuration...
Using only one general purpose transistor this circuit is powered by batteries. The lamp of the...
Can be used as a shield, this old American documentation circuit offers digitally selected...