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OTL, Output Transformerless Amplifier User Group.

Correction- the supply voltage is a little higher.

With no load it can exceed 150 volts so a 200V device is prudent.

I don't agree with Dave's assessment that the quality of the cap is more valuable than the value of the part. There are timing constants involved, and since the amp is full power to 2 Hz you can get into trouble if the timing constants in the power supply are not as low as that of the amp itself.

In the stock driver supplies the timing constants are to -3 db at about 0.8 Hz. If you cut the value in half you will introduce IM distortion no matter what kind of cap you have. IOW the 200uf amounts seen in the supply are adequate, don't allow for less than that value or you open a can of worms. As we all know, once such a can is open, it take a whole lot bigger can to get them all back inside again :)


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