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Old 26th October 2005, 05:48 PM   #791
troystg is offline troystg  United States
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Jason's


.... Waiting 60 seconds...................


EDIT:

While waiting it stuck me what the 1/4 watt resistors were also and there should be three of them on my output boards instead!!

Well I guess those were not in the 2 kits I ordered either...

I guess my naivety got the best of me here.... I NEVER contemplated incomplete kits! Ok one cap no biggie... But now we're talking 2 caps and 12 resistors per kit x 2 kits. Now I see why I have been scratching my head.

Edit 2: Atrocious spelling.
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Old 27th October 2005, 05:23 AM   #792
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Cheer up, mate.
Don't be too hard on yourself, Troy. It is actually a bit confusing with all those different varieties on the same board Just take a look at the A-X boards ver 1.0 It would be a lot easier if it was like; one PCB, one BOM, one amp

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Old 27th October 2005, 12:57 PM   #793
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Quote:
Originally posted by Tweeker
Is this the zener that is recommended to be bypassed by 1-4.7uF as a mod?
Yes, I'm pretty sure its a mod to possibly lower noise. Absolutely optional and experimental I think. I don't think Nelson used it in commercial versions but I certainly recall him offering it as a potential upgrade. He suggested starting with 1uf and possibly more. The higher the value the more turn on thump you may get.

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Old 1st November 2005, 04:26 PM   #794
troystg is offline troystg  United States
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Ok I bought some 2% Metal film resistors @ Fry's yesterday for the output boards.

They were out of 220 Ohm, so I bought 200 and 470.

Which should I use? The 200 or 2(two) parallel 470's?

How critical is that 20Ohms? It is 20% of the value... I can either go 20 down or 15 up from the spec'ed 221....
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Old 14th November 2005, 08:23 PM   #795
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The 220 Ohm resistors are not really critical. The 220 Ohm will get you enough margin to prevent oscillation while maintining enough speed.

Go higher, say 470 - 820 Ohm and have more safety with less speed.

Go lower, say 50 - 100 Ohm and enjoy high speed with high risk of oscillations.

(I actually have achieved 22 amps at 11Mhz...and winded up with super heated FET's)
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Old 14th November 2005, 09:31 PM   #796
troystg is offline troystg  United States
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Quote:
Originally posted by Tarasque
The 220 Ohm resistors are not really critical. The 220 Ohm will get you enough margin to prevent oscillation while maintining enough speed.

Go higher, say 470 - 820 Ohm and have more safety with less speed.

Go lower, say 50 - 100 Ohm and enjoy high speed with high risk of oscillations.

(I actually have achieved 22 amps at 11Mhz...and winded up with super heated FET's)


Thanks Tarasque for the reply. I did error on the side of caution and went the parallel 470 route so I have 235 Ohms in each position. Now I just need to order the caps...

22 amps @ 11Mhz!!! Doing radio transmissions? Applied for your broadcasterís license?
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Old 18th November 2005, 02:08 PM   #797
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Any need to match ouput devices on the mini?
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Old 18th November 2005, 02:17 PM   #798
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Quote:
Originally posted by chipco3434
Any need to match ouput devices on the mini?

Not really, since there is only one gain FET per channel, but if you're a purist perhaps you would like left and right to be exactly the same
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Old 24th November 2005, 01:27 PM   #799
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I'm missing a couple items on amp board... nothing serious. In the position of R12, a 750 ohm, would a substitute of 820 (in the kit) or a 680 (on the bench) be the better choice?
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Old 27th December 2005, 12:13 AM   #800
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Default Mini & 30 combo

So here's my project...

It's a combo Mini & 30... four channel for bi-amping some line arrays...

I am waiting for the second transformer...
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