Now that I see the schematic; I've the following questions/suggestions on the "finished product" circuit.
1) What core did you use?
2) Do you have a scope or multimeter which measures the frequency it is switching?
3) Wouldn't it be better that ZD1's cathode be connected AFTER R5, to compensate for the voltage drop under load (at 100mA, it will drop a full volt).
4) If you will be powering logic circuits with this supply, wouldn't it be better if the zener is instead 4.3 or 4.7 volts? The zener + Q2be voltages could exceed the max 5.5 volts of most microprocessors.
Other than that, a single word: BRILLIANT!
Congrats!
1) What core did you use?
2) Do you have a scope or multimeter which measures the frequency it is switching?
3) Wouldn't it be better that ZD1's cathode be connected AFTER R5, to compensate for the voltage drop under load (at 100mA, it will drop a full volt).
4) If you will be powering logic circuits with this supply, wouldn't it be better if the zener is instead 4.3 or 4.7 volts? The zener + Q2be voltages could exceed the max 5.5 volts of most microprocessors.
Other than that, a single word: BRILLIANT!
Congrats!