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cobretti wrote:I would like to know the differences in 1.01 revision.
amb wrote:Yes you're correct. Just build the high-power class AB version but bias the output stage to about 1.4A quiescent. To do that you need to change R25, R26, VR2 and VR3 to the pure class A variant's values. All other parts can remain the same as the high-power class AB version. If you want a max of around 80-100W output then you can reduce the σ22 output voltage to ±30V and the unregulated supply to ±25V.
Note that you will need even more heat dissipation capability due to the higher rail voltages than the lower-power pure class A variant! The dissipation will be about 140W per channel while idling!
shonne wrote:with unregulated supply +/-25V, bias 1,4A will be 30-40W in A class, σ22 ouput voltage +/-30V around 80-100W in AB...what will happen if I choose σ22 ouput voltage +/-36V,... more power?
amb wrote:shonne wrote:with unregulated supply +/-25V, bias 1,4A will be 30-40W in A class, σ22 ouput voltage +/-30V around 80-100W in AB...what will happen if I choose σ22 ouput voltage +/-36V,... more power?
No, the output power is determined by the unregulated supply's rail voltage (for the output MOSFETs), as long as the regulated supply (σ22) voltage is a few volts higher than the unregulated supply.
obee wrote:If the unregulated power is +/-15v, then is it okay to use +/- 18v regulated DC? Which means 20V AC transformer.
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