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Old 13th September 2014, 03:52 PM   #1
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Default Any kits for high quality simple preamp

Hello
Can anyone recommend a kit for a simple high quality preamp to amplify the output of my dac. Say with gain of two or three.
Thanks
thyristor44
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Old 13th September 2014, 04:45 PM   #2
Mooly is offline Mooly  United Kingdom
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Does it have to be a kit ? OK, that was the question so here are a couple,

K8084 - VELLEMAN KIT - VOLUME & TONE CONTROL PRE-AMPLIFIER | CPC

PM-1 - CEBEK - PRE-AMPLIFIER | CPC

(click further details... would want PM4, and two of them)

And another,
Browse for Products | CPC

If you fancy making your own preamp then its as simple as one opamp and around six resistors for a stereo unit.
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Old 14th September 2014, 01:47 AM   #3
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I have something like that, very simple, measures only 25 x 40 mm, but it is not a kit, it's ready made module.
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Old 14th September 2014, 03:40 AM   #4
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Thanks for replies.
Never thought of cpc Mooly, bit if they did a PM-1 in stereo it would be ideal.
Alternatevely I could make one on veroboard, single ic, gain of about 2-3, preferably single 12v rail.Dont have schematic though.
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Old 14th September 2014, 06:28 AM   #5
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Its easy to make a simple single rail preamp. I'll draw you one.
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Old 14th September 2014, 06:50 AM   #6
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This has a gain of 3. The opamp can be something like a TL072 or NE5532.

Rin defines the input impedance.

Rg sets the gain which is (Rf+Rg)/Rg

The zener sets a stable midpoint voltage to bias it all.
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Old 14th September 2014, 07:30 AM   #7
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Quote:
Originally Posted by thyristor44 View Post
Thanks for replies.
Never thought of cpc Mooly, bit if they did a PM-1 in stereo it would be ideal.
Alternatevely I could make one on veroboard, single ic, gain of about 2-3, preferably single 12v rail.Dont have schematic though.
I thought I read in the first post that you need a quality one
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Old 14th September 2014, 07:40 AM   #8
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Thats brilliant Mooly, I could use one ne5532 and make dual amp. Where would be the best place for a trimmer pot to vary gain from 1 to 3, preferably twin gang if they exist. Things have moved on alot since I made anything.
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Old 14th September 2014, 07:52 AM   #9
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Quote:
Originally Posted by thyristor44 View Post
Thats brilliant Mooly, I could use one ne5532 and make dual amp.
Far from brilliant, not even quality.
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Old 14th September 2014, 08:20 AM   #10
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You don't want to make an amplifier with variable gain, it's not good engineering practice. All you need is an attenuator at the pre-amp output - aka a volume control.
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