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Old 9th February 2006, 04:46 PM   #21
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I have used diamond buffers (never seen before ) in some of my designs and I did some experimenting with higher currents. My conclusion was that it got quite unstable (the bias) with a big ratio between the driver transistor and the output transistor. 1:5 works good.

As a power unit I think this never seen design needs a bit more development.
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Old 9th February 2006, 06:03 PM   #22
beppe61 is offline beppe61  Italy
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Quote:
Originally posted by peranders

1) I have used diamond buffers (never seen before ) in some of my designs and I did some experimenting with higher currents.
My conclusion was that it got quite unstable (the bias) with a big ratio between the driver transistor and the output transistor. 1:5 works good.
As a power unit I think this never seen design needs a bit more development.
Dear Mr. Peranders,

1) speaking of the diamond topology I remember a headphone amp with no gain (i.e. a buffer) suitable for Grado headphones that had really impressive figures.
The idea of building a high current diamond buffer is very intriguing indeed.

That said what do you think of the power section of the attached schematic ?
It is so basic that even it seems just not possible it works!
Does it has any chance to sound good?

Thank you very much indeed.
Kind regards,

beppe
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Old 9th February 2006, 11:27 PM   #23
anatech is offline anatech  Canada
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Hi P-A,
I have done a fair amount of work with power diamond buffers. Fantastic detail at low power levels. Large current excursions cause a lot of problems. No signal bias current is a problem at high driver to output ratios.

-Chris
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Old 10th February 2006, 12:04 AM   #24
mtlin12 is offline mtlin12  Taiwan
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Quote:
Originally posted by peranders
I have used diamond buffers (never seen before ) in some of my designs and I did some experimenting with higher currents. My conclusion was that it got quite unstable (the bias) with a big ratio between the driver transistor and the output transistor. 1:5 works good.

As a power unit I think this never seen design needs a bit more development.
My Power Diamond Buffer is quite stable, and now a Taiwan Audio
company is preparing to mass product this Power Follower with
their own 10dB step-up IPT.


How about a Power Follower with an IPT?

This is their all-in-one PCB
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Old 7th March 2010, 07:35 PM   #25
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Default Power Follower 99C

Hello

I'm in the process to give a try to the Power Follower 99C .Unfortunately I don't know how to contact to Andrea .
I do not have his E-mail address .
I have a question
On the schematic there is one 2k2 resistor and one 220R
On the layout there is two 2k2 resistor and no 220R .
I dont know which one is correct .Can someone help me lease with these problem .
Thank you very much

Greets gabor
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File Type: gif Follower_99b_layout1.gif (48.7 KB, 88 views)
File Type: gif Follower_99c.gif (29.2 KB, 92 views)
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Old 7th March 2010, 08:00 PM   #26
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Quote:
Originally Posted by gaborbela View Post
Hello

I'm in the process to give a try to the Power Follower 99C .Unfortunately I don't know how to contact to Andrea .
I do not have his E-mail address .
I have a question
On the schematic there is one 2k2 resistor and one 220R
On the layout there is two 2k2 resistor and no 220R .
I dont know which one is correct .Can someone help me lease with these problem .
Thank you very much

Greets gabor
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Last edited by tiefbassuebertr; 7th March 2010 at 08:07 PM.
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