This source was obtained from a former publication for valves but also serves for powering common equipment requiring 250 V continuous. The transformer can be of the insulation type if the circuit is not valved and the diodes can be the 1N4007. Filter capacitors must have insulation voltage of 200 V or more. In some applications the filter shock can be replaced by a 1 k ohm by 10 W wirewound resistor.
