powersupply ac to ac
If you only need "a few mA" (I'll assume &lt;10 mA), then a simple shunt regulator will do what you want:







simulate this circuit &ndash; Schematic created using CircuitLab

The RMS current through the resistor and diodes is about 10 mA, so the resistor dissipates about 120 mW and the diodes dissipate at most about 60 mW each. The load can draw about 10 mA before the voltage starts to droop significantly.

The waveform at the load is more square than sine, but that shouldn't matter in this application.