Current Flowing Indicator.

[Joe]

OK, I've had a play.

I rigged a transformer up with four 1N4007s in a bridge with the following results:-

AC - 12.6V
DC - 10.1V
DC with smoother - 15.2V
DC doubled as in my PSU - 21.1V
DC doubled as per other diagrams - 25V
DC doubled as per other diagrams plus smoother across +ve and -ve - 26.5V

All capacitors 220μF and all measurements made with DMM using a 180Ω resistor as a load.

- Joe