Circuit description

The rectifier bridge consists of D1-D4, D5-D8. Chosen diode is MUR3020WT but any dual diode common cathode with TO218 or TO247 case will fit. You can also use single diodes in TO220 case. The pcb has clear markings of anode and cathode in the silkscreen print in order to get the right diode.

Each diode has also a snubber for reducing EMC. The right value depends of chosen diode and current. See the presented values as a start, not a final choice.

Different heatsinks

Depending of current needs you can choose different sizes of heatsinks. From left: 2", 1.5" and 1" high heatsinks.

LED's, voltage indicators

LED's (H1 and H2) are located at the input terminals. They can be any colour and can be tuned to shine as much as the double 0.6 watts metal film resistors (R13, R15 and R14, R16) can handle.

Bleeder resistors

Since you can mount at least 27000 uF x 8 it may be necessary to have bleeders in order for the power supply to get discharged. The value of the resistor is a trade-off between power dissipation and discharge time which is determined by the total capacitance and also of the amplifier in idle power consumption.

The external inductors

X3 and X4 are connectors for external inductors or resistors. You get a glims of X4 in the picture above.If you only want a smaller resistor there is place for two 7 W resistors at R11 and R12

The fuseholders

The pcb has footprints both for European 5 x 20 mm fuses and also for the American type 6.3 x 32 mm. This fuseholder can be seen at the left. At right the European fuseholder has a cover which is not entirely necessary if you have low voltages but can be wise since a short circuit will created damages.

The huge terminal blocks


The chosen terminal blocks are huge, high-end you know, but not entirely necessary. Therefore you have additional holes for plain 10 mm terminals.

The smoothing caps



You can use three different pinouts of the smoothing caps. The most common types is the one with only two pins, called aPOS, aNEG at the pcb.The upper left cap is a heavy duty cap and has four pins because it weight more and needs a more firm mounting. It's called bPOS and bNEG in the pcb. The extra heavy duty cap from BHC has five pins and they are called cPOC and cNEG on the pcb. Those caps are really good but also really expensive.