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Old 12th May 2010, 07:37 AM   #21
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by circuitscc View Post
The circuit was designed by Mr. Thom Kaman.

This is an all JFET line stage.
thanks circuiscc, Im in for a couple
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Old 12th May 2010, 08:06 AM   #22
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Greg,

Good catch!
I should have sent all my files to you for proof reading before posting.
Just kidding.

circuitscc
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Old 12th May 2010, 12:56 PM   #23
SRMcGee is offline SRMcGee  United States
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circuitscc:

Would you consider offering a soft start module, preferably one capable of handling the demands of a large power amplifier? I am considering building a couple of large amps (Aleph J-X) and will probably use toroids that are in the 800 to 1000 watt range. I don't have a circuit (and lack the skills to evaluate those that are available on the web), but there might be a decent demand for a low cost, well-designed soft start pcb.

Regards,
Scott
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Old 13th May 2010, 02:44 AM   #24
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The following pictures show 3D views of my circuit boards.

Only with the help from Greg can I post them on this thread.

Thanks Greg!
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Old 13th May 2010, 02:47 AM   #25
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Here are the picture files :
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File Type: jpg Pre-Amp-FET-1 #1.jpg (385.8 KB, 265 views)
File Type: jpg Pre-Amp-FET-1 #2.jpg (378.7 KB, 256 views)
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Old 13th May 2010, 03:03 AM   #26
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Hi Scott,

Have you tried NTC ICL (inrush current limiter)?

It is not as good as a soft starter but simple and inexpensive.

I used them in my diy power amps with good results.

Hope this helps.

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Old 13th May 2010, 08:56 AM   #27
Luke is offline Luke  New Zealand
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the pots you have used are hard to find, why not bournes pots?
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Old 13th May 2010, 09:25 AM   #28
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Luke,

You raised a very good question.

Initially Bourns 3296 was used in the layout. It is very precise but overkill. Bourns costs USD2.50 per piece. CTS (the one in my final layout) costs only USD0.50. As there are 4 trimmers per board, savings will be USD16.00 for 2 channels. My intention is to make a LOW COST assembly that everyone could afford.

If there is enough support for this project price per (bare) board will be less than USD10. This can happen when total board area reaches 25 sq.ft.

I can buy the trimmers in the US and send to you with the boards.


Regards,
circuitscc
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Old 13th May 2010, 11:00 AM   #29
Luke is offline Luke  New Zealand
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ok but you get what you pay for
Here in local store we can only get bournes. (that Im aware of)
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Old 15th May 2010, 03:16 AM   #30
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Greg,

You deserve one pair of bare boards for making this beautiful picture.
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File Type: jpg Pre-Amp-FET-pop-1.jpg (513.1 KB, 181 views)
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