[VoIP] Coin relay controller

[Mark Rudholm]

Donald Froula wrote:
> Sorry, I should have read more carefully. I was using
> two 120VAC:18VAC transformers with their secondaries
> connected together for isolation and current limiting.
> That provided the 170 VDC after filtering.

Ah, so you effectively constructed a 1:1

Mouser has small (100-200mA) 2:1 transformers
that are quite suitable for this application.