This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
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...