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diyAB Amp  The "Honey Badger" build thread
diyAB Amp  The "Honey Badger" build thread
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Old 7th February 2018, 04:35 PM   #3011
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by medi57 View Post
Will it hurt? ...........
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
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regards Andrew T.
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Old 7th February 2018, 05:01 PM   #3012
prasi is offline prasi  India
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diyAB Amp  The "Honey Badger" build thread
Quote:
Originally Posted by AndrewT View Post
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
If its just a matter of device dissipation and Heatsink, he can do the following
1. use use MJL devices
2. use a speed limited fan, xrk uses them often.

This could just save heavy expenses.

But I wonder if its just the devices and heatsinks that need attention.
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Old 7th February 2018, 05:15 PM   #3013
medi57 is offline medi57
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Join Date: Dec 2017
Quote:
Originally Posted by AndrewT View Post
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
45 it is!

Thanks
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Old 11th February 2018, 09:17 AM   #3014
stuartmp is offline stuartmp  Australia
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Location: Gold Coast
Hi All. I was just wondering if there is a more detailed description of how this circuit works. I am fine with 90% of it. I just don't see exactly how the output of the differantial pair drives the vas. It looks like the output of the current mirror (top left of the schematic) is attached to two pnp transistors which form a VAS cascode (top center of the schematic) which is then supplying the bias current for the vbe multiplier which drives the output transistors.

If someone can provide me so more details or point me to a older post discussing this that would be awesome.

Cheers

Stuart

Last edited by stuartmp; 11th February 2018 at 09:31 AM.
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