This simple adjustable source uses a PNP transistor that can be the BD136 for even slightly higher currents. The transformer must be 6.3 V x 500 mA, and a voltage doubler is connected to the rectified output.
This simple adjustable source uses a PNP transistor that can be the BD136 for even slightly higher currents. The transformer must be 6.3 V x 500 mA, and a voltage doubler is connected to the rectified output.