This circuit is from an old American documentation and its use in motorcycles with 12 V is suggested to power 6V radios. The transistor can be the BD136 and BC548.
Texas Instruments PCM5242 Audio Stereo Differential-Output DAC is a monolithic CMOS integrated...
Emitt This crystal-controlled oscillator can generate signals from 100 kHz to over 30MHz. The...
With this circuit it is possible to fire an SCR from the light that falls on a phototransistor. The circuit...