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Old 1st September 2009, 12:15 AM   #21
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OK, looks like all those things are covered - I knew you would have, but its worth double checking (given my past experience ).


Go try what papa says!


Fran
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Old 1st September 2009, 01:17 AM   #22
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Thank you, Fran. I appreciate your time and input.

Vince
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Old 2nd September 2009, 07:09 PM   #23
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Does the F5 need more drive than an ipod can provide? To save space my current setup is an iPod to a B1 to a gain clone. I have a BOZ and BLS in storage.

Thx,

V~
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Old 4th September 2009, 11:53 PM   #24
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No, an iPod can drive an F5 quite loudly.
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Old 5th September 2009, 12:52 AM   #25
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Quote:
No, an iPod can drive an F5 quite loudly
That's what I was afraid of.

Also, replacing R3 & 4 with a 3.3k resistor brought the bias voltage closer to .59, but not close enough. It gets up to about .50, then drifts downward. Still no DC at output. Might try 4.7k resistors just for fun.

Thanks,

V~
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Last edited by vdi_nenna; 5th September 2009 at 12:56 AM.
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Old 7th September 2009, 01:16 AM   #26
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Can I use the same test gig to test P-Channel jfets as showing in post #15?

Thanks,

Vince
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Last edited by vdi_nenna; 7th September 2009 at 01:23 AM.
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Old 7th September 2009, 01:20 AM   #27
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Quote:
Originally Posted by vdi_nenna View Post
Can I use the same test gig to test P-Channel jefets as showing in post #15?

Thanks,

Vince
Not exactly, got to flip things around.

Check this one out.
http://www.diamondstar.de/transistor_matching_jfet.html
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Old 7th September 2009, 01:24 AM   #28
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Thanks Tea-bag, that was quick!
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Old 10th September 2009, 09:13 PM   #29
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Default Found the problem

The schematic Fig 6 shows Q3 as a IRFP9240 and Q4 as a IRFP240.

The article says, "The output MOSFETs are the IRF240 N channel type (Q3) and the IRD9240 P channel type (Q4).

I'm probably the only fool that followed the article instead of the schematic.
Can someone verify this for me?

I'm using IRFP140s and IRFP9140s.

Thanks,

Vince
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Old 10th September 2009, 10:27 PM   #30
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Yep, that's wrong in the article. The schematic is correct.
Here is the schem sans protection circuit.

You are there now.
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