900W H-class PA Amp with Limiter

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crazymechanic

Member
Joined 2009
just a BTW addition I now use a 6VA rated transformer for the stereo protection circuit and with longer use the small transformer is getting quite warm on the border of hot , so maybe this protection board needs say 12VA , and I don't have fans attached to the protection board with fans probably the 6VA transformer would be way too small.
 
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AndrewT

R.I.P.
Joined 2004
crazymechanic said:
just a BTW addition I now use a 6VA rated transformer for the stereo protection circuit and with longer use the small transformer is getting quite warm on the border of hot , so maybe this protection board needs say 12VA , and I don't have fans attached to the protection board with fans probably the 6VA transformer would be way too small.
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6VA 12Vac is 500mAac rated.
that allows a maximum continous DC current of around 250mAdc.
For cool operation de-rate to about 50%, i.e <130mAdc continuous.
But very small transformer are usually designed that they run hot even when supplying no current.

Check to see how hot it runs when the load is disconnected.
 
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gothye1984

Member
Joined 2010
Prepare to build H900 with uC protection and ethernet interface to diagnostics.
Transformer has power about 3500VA and 8 x 38V AC (power is measured)
 

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