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Old 4th October 2012, 06:15 AM   #11
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Join Date: Nov 2007
Location: It's more fun in the Philippines
Default Diamond Amp

[QUOTE=TimS;1716796]
Quote:
Originally posted by lumanauw
[B]Put emittor follower before Q1-Q2's base?

As suggested by Lumanauw (thank you) I put an emitter follower before Q1 and Q2 and it improved the performance even more.

You should also notice that R169 and R170 are not 100R any more. I found that you can trim the diamond stage current matching and cancel the distortion even further. This in turn does increase the output bias which does increase the distortion, so R172 and R173 have to be adjusted as well to keep the 3-6mA/stage output bias.

With these tweaks the
distortion drops to 0.002% and the
output impedance is 0.001R.
(All simulated for the moment)

With such a low output impedance the amp can drive a 2R load with ease and low distortion.

A cool running amp, such as this design, is very useful in the hot summer days that we are having in New Zealand at the moment.

Cheers

Tim
Dear Tim,

Been looking for a Hiraga 20W biased into Class AB or B and your post was returned. Since this post is almost years now, I wonder if you were able to build this amplifier?

I had built a JLH Class A (single supply and dual supply on Geoff's page) but since I'm located at a tropical country, The amp gets really hot and I have to put a box fan to cool the heatsink.

I'm very much interested to build your amp although I would appreciate if the output amp can be changed to a bipolar transistor (have extra MJ15024G).

Would appreciate your advice and further information.

Best regards,
Nuki
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