With the configuration shown, the output capacity of the LM12 can be doubled, which is 4 A. The circuit is from the Linear Applications Handbook of the National Semiconductor of 1994.
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...