Electronic DIY kit: Power supply for vacuum tubes circuits with an EMI filter
Provides power to the vacuum tube circuits with unstabilized anode and heater voltages. The board size: 123 x 80 mm.
Integrated noise filter (EMI).
It is possible to provide positive voltage by the heater chain in order to deal with the 50Hz noise.
The set is supplied as a printed circuit and a kit of parts.
It is possible to purchase the set without the power transformer.
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Instructions for assembling and tuning the device:
Install and solder all the parts on the board according to the circuit diagram and the board layout. Pay special attention to the correctness of transformer windings connections with the board. Be attentive when installing the ceramic capacitors in high-voltage and heater circuits. They have different breakdown voltages.
The R2 and R3 resistors and the R0 jumper are optional and are used to provide positive voltage in the heater circuits to deal with the 50Hz noise. You decide whether to install it or not. It depends on the noise level in the powered device. Also, you can organize an artificial midpoint by installing resistors instead of capacitors C11 and C12.
A properly assembled power supply does not have to be tuned. If required, you can use the R1 resistor to set the wanted anode voltage on load.
Besides the the standard toroidal power transformer, almost any other power transformer can be used in the unit, without exceeding the voltage limits for the electrolytic filter capacitors.
When exceeding 6,8V use a quenching resistor or reconnect the primary winding of the transformer to a 240V voltage!
