Despite its small size this Power Supply PCB contains everything needed for a stabilized HT and regulated DC heater supply with soft start. Ideal for use with ValveWizard phono PCBs. This PCB is aimed at advanced users who can complete and adapt the component values to their needs.
The HT is stabilised with a simple MOSFET capacitor multiplier, creating a highly smoothed supply, but not strictly regulated. This means the output voltage will adapt itself to whatever your input voltage is, and no heatsink is required for currents up to 50mA dc.
The AC input can be single winding or centre-tapped. Full-wave voltage doubling can also be inplemented. For voltage doubling, link pads 1&2.
Maximum AC input voltage: 350V rms (or 350-0-350V), allowing you to generate an HT of up to 450V DC max.
The heater supply is regulated with a standard 3-pin regulator IC (e.g. an LM317) which should be heatsinked. The rectifier can be a flatpack or inline package. The reservoir capacitors can be connected in series, parallel, or as a full-wave voltage doubler. The heater supply can also be elevated. For parallel caps, link pads 3&5, and 7&8. For voltage doubling, link pads 3&4, and 6&7.
Maximum heater current: 3A
Components not included.
Colour may vary.