This circuit is indicated for supplying the CB17495E transmitter. The BD135 must have a small heat radiator and the zener may eventually have a higher voltage.
This circuit can drive a loudspeaker with near 1 W of Power from 6 to 9 V supplies. The circuit...
This “one channel” demonstration circuit was found in the April 1979 issue of Radio Electronics magazine....
This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...