This circuit is from a 1972 Motorola publication. The used transistor can still be found, but it can be used equivalent. The circuit is powered by the amplifier with which it must operate.
January 2017 - The new Schottky SDM02M30LP3 from Diodes Incoporated for 10 mA currents and 30 V...
This circuit activates a buzzer when the voltage applied to the input falls below a preset value in...
This circuit was found in an 80's General Electric documentation. The circuit uses components from the...