On 21 September 2011 01:16, Electron wrote: > > One problem I see with non isolated capacitor-coupled PSU's is that if > a transient hits the line, then the capacitor will happily pass it.. > > This can be mitigated by adding a shunt capacitor - effectively making the input a capacitive voltage divider. Or, more commonly by using a zener or TVS diode in the same position. RP --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .