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Old 21st June 2011, 06:24 PM   #11
klewis is offline klewis  United States
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Hugh,

You can put me down for a pair. Looks like fun.

Ken
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Old 21st June 2011, 07:39 PM   #12
RonR is offline RonR  United Kingdom
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I'd like to put my name down for a pair Hugh.

WRT Mosfet part numbers, I can't find the mentioned ZVP2210 anywhere. Do you mean ZVP2110?

Cheers,
Ron
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Old 21st June 2011, 08:47 PM   #13
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I thought it was the ZVP3310A, not 2210.

- keantoken
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Old 22nd June 2011, 12:08 AM   #14
AKSA is offline AKSA  Australia
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Folks,

Fantastic, we are making good orders already!

That's 10 boards so far:

2 JoMo Adelaide SA Australia
2 Ian Finch Coffs Harbour NSW Australia
2 Gennaji Hyderabad India
2 Ken Lewis LA USA
2 Ron Russell Kent UK

Moving right along......

I have attached a portion of the pdf for the VAS device, ZVP2110G, the SOT223 version. My apologies Bwana, I got the name wrong. Senior moment! Below this is the latest pcb, growing more artistic with each day now.

This device is about $1.20 from Digikey, and comes in the smd package which will dissipate 2W max. In this application we will be doing around 430mW, so it will get warm, a little too much for the TO92 package which is rated only to 740mW max. This device has very similar specs, with max continuous drain current just over 300mA and Ciss of 100pF, considerably better than the IRF9610 it replaces.

Gaetan, you are 100% correct; there is provision on the pcb for experimentation with a phase lead cap (VAS drain to jfet source), which I would expect to make this amp extremely load tolerant. Two sizes have been accommodated.

Cheers,

Hugh
Attached Images
File Type: gif ZVP2110G.GIF (57.4 KB, 1860 views)
File Type: gif FetzillaPCB.gif (45.7 KB, 1833 views)
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Last edited by AKSA; 22nd June 2011 at 12:55 AM.
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Old 22nd June 2011, 01:12 AM   #15
jkeny is offline jkeny  Ireland
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Yes, Hugh, I really appreciate you doing this & was fascinated at the novelty & pace of the thread that gave rise to this design.

I'm in for a pair please!
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Old 22nd June 2011, 04:05 AM   #16
AKSA is offline AKSA  Australia
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Hi John,

You're in!!

That's 12 boards so far:

2 JoMo Adelaide SA Australia
2 Ian Finch Coffs Harbour NSW Australia
2 Gennaji Hyderabad India
2 Ken Lewis LA USA
2 Ron Russell Kent UK
2 John Kenny Dublin Ireland


This is building steadily!!

Hugh
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Old 22nd June 2011, 05:22 AM   #17
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Quote:
Originally Posted by AKSA View Post
Gaetan, you are 100% correct; there is provision on the pcb for experimentation with a phase lead cap (VAS drain to jfet source), which I would expect to make this amp extremely load tolerant. Two sizes have been accommodated.

Cheers,

Hugh
Hello Hugh

I've read a white paper where it say that using a phase lead cap would reduce the phase intermodulations.

Bye

Gaetan
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Old 22nd June 2011, 08:45 AM   #18
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Count me in for a pair too!



Fran
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Old 22nd June 2011, 11:41 AM   #19
AKSA is offline AKSA  Australia
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Hi Francis,

Thanks for your interest!

14 boards so far:

2 JoMo Adelaide SA Australia
2 Ian Finch Coffs Harbour NSW Australia
2 Gennaji Hyderabad India
2 Ken Lewis LA USA
2 Ron Russell Kent UK
2 John Kenny Dublin Ireland
2 Francis Morrin Dublin Ireland

I'm conferring with Paul Bysouth tomorrow over the models, and we will scrutinize the circuit to be sure. Then, after chatting with Greg, I will publish. This circuit is extremely critical on choice of voltage amplifier and I will admit I'm loathe to post until I know the chosen beast, ZVP2110G, is confirmed good.


Hugh
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Old 23rd June 2011, 01:42 PM   #20
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Dear Hugh,

You can put me down for a pair.
Thanks!

Best regards,
Vitali
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