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Old 6th October 2012, 10:25 PM   #11
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Hi Rick,

You are welcome. Will you consider output coil//resistor? Are you going to match the MOSFETs?

Cheers,
Panson
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Old 7th October 2012, 03:00 AM   #12
rsavas is offline rsavas  Canada
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Hi Panson,

Yes I will consider coil/resistor but it will not be put on the PCB, no room unless I make the PCB a slightly bigger.
Do you consider these Lateral FETs to be any better, sound quality wise, than the General Purpose IRFP devices?

Regards
Rick
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Old 7th October 2012, 09:02 AM   #13
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Hi Rick,

I don't know much about this MOSFET. Is it only available from Farnell? I am looking forward to evaluating it.

The PCB house (www.batchpcb.com) you ordered PCB seems to be very inexpensive.

Cheers,
Panson

Last edited by panson_hk; 7th October 2012 at 09:05 AM.
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Old 7th October 2012, 12:45 PM   #14
rsavas is offline rsavas  Canada
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Hi Panson,

Yes, it seems that Farnell is the only one that I can find stocking these FET parts? They show limited qty's available.

I have not used (www.batchpcb.com) yet. We shall see. Limited in capabilities, but for prototypes, they are the ticket.

Cheers,
Rick
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Old 7th October 2012, 03:00 PM   #15
mj777 is offline mj777  Philippines
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I will be following this thread, I'm also interested with this kind of amp and will try to build if there is available pcb.
regards,
mj777
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Old 18th February 2013, 01:36 PM   #16
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Hi rsavas,
I'm interested in your research........
Project stopped or going on this year?
Please inform us about actual status.
Regards
Harry
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Old 18th February 2013, 01:45 PM   #17
rsavas is offline rsavas  Canada
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Hi Harry,

Thanks for asking, it is going slowly but I am moving along. Lots of design/layout work done so far. Yesterday I finished design/layout of the AC input assembly. I neede a soft-start for the big transformer (used from a Pioneer SX-1250) Ordered parts from Newark, they had the ALFET Latfets on sale, so will keep posting as I go.
Rick
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Old 18th February 2013, 01:45 PM   #18
scholl is offline scholl  United States
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Default Is this an improvement?

Are these types of designs an improvement over the many used MOSFET amps available for $100-200 USD?
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Old 18th February 2013, 02:02 PM   #19
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Looks nice -- with the non-inverted mode consider using an Elna silk (audio) capacitor -- available from DK.

Bob Cordell showed a design with an OPA2604 as buffer, inverter to the "-" input. I've done this with the LM4702 and lateral mosfets and the results are really nice -- and you can omit the input coupling cap. You can easily add it onto the design at a later date once you've completed the original.

Lateral mosfets are wonderful sounding devices.
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Old 18th February 2013, 02:33 PM   #20
regal is offline regal  United States
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Quote:
Originally Posted by scholl View Post
Are these types of designs an improvement over the many used MOSFET amps available for $100-200 USD?
es the biggest being perfect phase inversion so that a complimentary mosfet isn't require, these never match so this design should be about the lowet in THD in a lateral mosfet output possible.

If you order PCB's and need a groupto go in for lower cost let us know.
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