The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We found this setting in the 1994 National Semiconductor Linear Applications Handbook.
Recommended by 90s a Radio Electronics, this unit uses a transformer with a 70 V x 5 A secondary,...
This high voltage regulator uses only two passive components. The output is 100 V, but replacing...
This circuit detects magnetic fields by approximation, using a Hall sensor. The components are...