This circuit is recommended for alarm systems since it has a good output stage. The circuit is from a Radio Electronics magazine from October 1992.
This circuit was obtained from ancient documentation using transistors of the time. The circuit...
I found this circuit in an old Argentine publication from 1973. The components are no longer...
This ammeter measures currents in 5 ranges from 50 uA to 0.5 A using a 40 uA instrument, which can be...