This low-power converter will supply about 100 mW of dc to a load and it is useful to isolate or derive dc voltages. It operates at around 200 kHz. LI is wound on a 22-mm diameter 13-mm high pot core with #32 magnet wire. The primary is 80 turns and the secondary is 80 turns (for 12- V nominal output). The two windings should be insulated for the expected voltage difference between input and output in insulation applications.