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Old 7th November 2005, 12:47 PM   #11
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Quote:
Originally posted by butler853
I found that bgmicro has them in stock for $1.95 each for 1-9, $1.50 for 10-99 and $.99 for 100+. Now I have no more excuses not to build Carlos' preamp.
AFAIK, BG Micro has 22,000 of them in stock
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Old 7th November 2005, 03:45 PM   #12
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Default Re: Re: Discrete Regulated Preamp PSU Pics

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Would you be interested in any of those?

How did you get those????!

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Old 7th November 2005, 03:46 PM   #13
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Quote:
Originally posted by Peter Daniel
AFAIK, BG Micro has 22,000 of them in stock
Aaahhh...
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Old 7th November 2005, 03:50 PM   #14
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Carlos, since you introduced that chip to the forum, I wouldn't mind sending you a few samples, (on condition you won't complain on pins layout)
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Old 7th November 2005, 06:45 PM   #15
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Quote:
Originally posted by Peter Daniel
Carlos, since you introduced that chip to the forum, I wouldn't mind sending you a few samples...
Great, thanks for the offer, I'll send you a PM.

Quote:
Originally posted by Peter Daniel
(on condition you won't complain on pins layout)
I won't.
It's not as good in that respect as the SMD version, but it's much easier to put a heatsink there.
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Old 7th November 2005, 07:03 PM   #16
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Quote:
Originally posted by carlosfm


Great, thanks for the offer, I'll send you a PM.



I won't.
It's not as good in that respect as the SMD version, but it's much easier to put a heatsink there.

Carlos, is there any problem with creating a large power plane on the V+ pins to be used for heatsinking on the topide then routing the rest to the bottom of the board? Here is my current plan, I was going to mount a heatsink to the large copper area near the top of the board.

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Old 7th November 2005, 07:20 PM   #17
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For those interested, here is the Eagle BRD file...do with it as you please.

One word of caution...CHECK THE POLARITY OF YOUR DIODES before you install them in this board, if you are using ISLR860's like I did you need to reverse them from what is shown on the board!!!!! I will not be held responsible if you blow up your capacitors and your wife yells at you for getting smelly oil on everything! (not that it has ever happened to me )

G.
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Old 7th November 2005, 07:56 PM   #18
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Quote:
For those interested, here is the Eagle BRD file...do with it as you please.
Nice board, G' Thanks.

Steen
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Old 7th November 2005, 08:47 PM   #19
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Quote:
Originally posted by Gcollier
Carlos, is there any problem with creating a large power plane on the V+ pins to be used for heatsinking on the topide then routing the rest to the bottom of the board?
Why don't you put the chip on the bottom side and use single layer, as you said?
Don't bother too much about a ground plane, specially around the signal pins, it creates capacitance.
Also, if you rotate the bypass caps by 90º (side by side) you will get the electrolythics much closer.
Your use of V+ for heatsinking is correct. But even then, the SMD chip gets quite warm.
You have space on that board for some poplyprop output dc coupling caps. These are optional. If you have input coupling caps on the power amp, no caps on the pre. Or vice-versa.

PS: Just before I hit 'submit' I've noticed that you are using that chip as a normal op-amp.
It won't work.
Have you seen my schematic?
You need a way to fine-tune DC-offset, that circuit I made also deals with the input dc-offset.
Otherwise you would have to use input dc-coupling caps to protect the volume pot.
Then you will muck up the performance of the pre by over-capping.
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Old 7th November 2005, 09:14 PM   #20
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Quote:
Originally posted by steenoe
Nice board, G' Thanks.

Steen


Steen...as I recall I owe you one, email me your address and I will pop it in the mail!


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