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BigCap PSU

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Big Cap Power Supply 100.000uF 80V

Power Supply Board 100.000/80 4 layer PCB w/ Ultra Fast Recovery Diodes

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100.000uF 80V Big Can capacitors per rail, with Silent Ground coupling, for bulding high end amplifiers.

Sound of large can capacitors vs. many small can capacitors with (almost) same capacitance
The 36D cans from Chemi-Con have a nice natural and acoustic sound to them, and better separation of instruments, compared to caps in the standard 10.000uF 63V setup. The caps have a nice deep bass, well controlled mid bass, and punctual mid - highs. The character of the sound is perfect for rock, jazz, classical, RnB, most contemporary music. Only for music types such as techno and house, the Nichicon caps (found in the 47.000uF / 100V power module) will do better.

Many small caps, as seen in many other power supply modules can perform nicely too, if they are connected the right way.
A T coupling will ensure there is no current wobbling between the capacitors, but unfortunately many times it's seen the the small capacitors are just parallelled. This will give a messy mid - high region, when the amplifier is playing at more than a few Watts power. In this case a big can power supply is much better.

This 80V version is for use with transformers up to 55V AC, (about 300 Watts RMS audio power in 8 Ohms from NCDV).

Gate Drive Regulator and Forward Voltage Drop
This PSU module has on-board Gate Drive regulator, deriving the Gate Drive voltage directly from the main transformer. So there is no need for additional 15V transformer or secondary winding. The 4 pin plugs are fully compatible with all our other power supply modules. The excess heat from the GD regulator is used to slightly elevate the temperature of the rectifier diodes to about 45 deg. C. This will constantly lower their Vf from 0.75V to 0.70V at 10A. This is industry leading low Vf. A typical 25A bridge rectifier will drop about 1V at 10A.

Ultra Fast Recovery Diodes
We use discrete rectifiers with extreme fast 35nS recovery time. Why is recovery time important? Well each time the transformer voltage drops below the charge voltage, the diode has to switch off the flow of current. Otherwise the capacitor would be discharged through the transformer winding, creating huge dips, and noises in the rail voltage. A normal cheap rectifier takes about 1 uS to stop conducting. Enough time to build up a reverse current flow in the transformer winding. When the diode releases, the winding is left open circuit with the current flowing, and this will cause RFI, which can affect your audio circuits, and lower the sound quality. It will also in some cases interfere with AM radio reception, so this subject is covered by EMI regulations and standards.

The 60EPU02 from International Rectifier has industry leading performance in recovery time, and low forward drop. In many other power supplies the rectifier is the cheap part, that is not really addressed in the design phase. However we find the rectifier to be an important link in the chain to achieve the best possible sound. That's why we spared no efford in this part, and you may be surprised to know that the rectifier diodes are in some cases the most expensive parts in some of our power supplies. We want to bring you the best, not the cheapest, and we think it's worth every penny.

Recovery of the 60EPU02 without any snubber network.

Silent Ground Coupling
This power supply module is not similar to the typical one you find from other makes. We use two bridges instead of one. So why use two, if others can make the power supply with just one? If you use say 10A out of the power supply, then the 10A have to be replenished from the transformer, in order to maintain the output voltage of 80 V DC. But even you draw out the stable DC current of 10A, the transformer can only recharge the capacitors in short bursts, just when the transformer voltage becomes higher than the DC voltage on the capacitors. This happens only about 10-20% of the time, depending on dimensioning of the transformer and capacitors. In other words the charge current becomes 50-100 Amp. in this example. If you only use one bridge to charge both positive and negative rail, then the 50-100 Amp. charge current will have to go through your GND point. This makes it rather hard to find a place on the GND rail without charge noise.
By using one bridge for each rail, we can supply the charge current directly to the capacitor, not going through the GND rail. The GND just connects the two main capacitors together, but there is no current going through there, hence it becomes silent. The effect in terms of sound is a more black background, and more clean tops. We use this coupling in all our power supplies.

NewClassD | Lars Clausen Technologies IVS | DK7500 Holstebro | Denmark | tel +45 31627823 | E-Mail: |19929