This circuit for a simple alarm system was suggested in an article in Electronics Now magazine. The circuit has a small power stage that can be changed.
This circuit, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...
This traditional amplifier configuration is from the National Semiconductor's Linear Applications Handbook...
This circuit is from GE technical documentation from the 1970s. The circuit can be implemented with SCRs...