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Quick direction please for Firstwatt F3 DIY
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Old 4th June 2012, 09:15 PM   #11
tp147 is offline tp147  Germany
diyAudio Member
Join Date: Nov 2011
hi here is a pic of my F3:
Click the image to open in full size.

It is only a 2HE case with 80mmm heigh.
The FFETs are all mounted to the inner heat sinks, Q2 and Q3 right in the corner to the outer heatsinks.
The coupling from inner to outer HS works well. With environment temperature of 20 C the inner HS is arround 48C with Cover on top. If Environment is above 24 C I lift of the Cover. Outer HS is always 3-4 C lower.

Don't bother with the amps near the transformer. My boards are quite near to the transformer and the F3 doesn't make any noise with no signal.

The rect diodes are mountet to the small inner HS you can see in the center of the case. With high environment temperature an cover on top th HS is arround 55 C and inside the head of the inbus screw is arround 10 C higher!

If your kids touching the _hot_ amp, they would do it only once. It will not cause heavy pain, but they will understand what is meant by hot.



Last edited by tp147; 4th June 2012 at 09:18 PM.
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