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Old 7th January 2005, 03:33 PM   #1
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Default help with chip preamp

I need schematics for a good ic preamp. I'll take all the help I can get
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Old 7th January 2005, 03:39 PM   #2
arcom is offline arcom  Croatia
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Hi!

Do you need just a preamp, or should it include tone controls as well? You can try with TDA1524A from Philips or LM1036 from National.
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Old 7th January 2005, 03:55 PM   #3
Nisbeth is offline Nisbeth  Denmark
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Have a look at project 88 or project 97 from sound.westhost.com


/U.
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Old 7th January 2005, 04:51 PM   #4
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Yes just a preamp

I made project 88 and 97 I'm looking for something different
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Old 7th January 2005, 07:43 PM   #5
Alcaid is offline Alcaid  Norway
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What about this one?

Click the image to open in full size.

From here
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Old 7th January 2005, 08:21 PM   #6
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Thank You

That 1. I need at least four more
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Old 8th January 2005, 08:45 AM   #7
Nuuk is offline Nuuk  United Kingdom
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When you get bored with IC's, you may lie to step up to something like this .
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Old 10th January 2005, 12:25 PM   #8
awpagan is offline awpagan  Australia
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Looking for more in on preamps
look at this
http://www.mhennessy.f9.co.uk/preamp/index.htm
keep you occupied for at least an hour or two?
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Old 10th January 2005, 09:27 PM   #9
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Default simple preamp

Hi.
As Alcaid suggested, the PMA -Pavel Macura- buffer alternative is a very good one. Check out if you need some gain, ´cause the system in the picture doesn´t have any. But it´s easy to re-arrange and convert it in a preamp. Check out Burr Brown´s appl.note ¨combining an amplifier with the buf634¨ in the link below.

I´m using something very similar, with a gain of 2.5, based on opa602ap. The BUF634 runs in high bandwidth mode -with little heatsinks attached, because in that config. the chip gets real hot-.

I recommend you with great confidence the OPA602: it´s not too picky a chip to use in this application, very stable and with excelent dynamics, but paradoxically with a superbly smooth sound. You´ll never get tired of it.

I have checked OPA134, 604 and 627 too. The latter is very, very good and revealing. But I happen to like more the 602.
If you use some sockets, you can change opas and make decisions more easily.
Enjoy!

PS: the link,
http://focus.ti.com/lit/an/sboa065/sboa065.pdf[/URL]
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Old 11th January 2005, 04:55 PM   #10
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Default chip preamp II

Jaudio, why don´t you try something very simple? -I mean a single opamp in some basic configuration, be it inverting or non inverting (it's up to your liking).
Previous to my experience with the opa/buf combo, I tried a simple topology for opa627: non inverting, gain 3, 2uF input cap, 100 k input impedance, 50ohms output resistor...
Add a good regulated PSU, +/-15v , with some fancy 2200 uF reservoir caps, and with good decoupling close to the chip -some paralleled 100n and 100uF from each opamp psu pin to ground-, and maybe you´ll get something interesting.
I have had very good results with that scheme. If you only need to feed a normal input impedance power amp with not very long interconnecting cables, you can skip the use of buffer chips.
Cheers
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