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Old 5th February 2004, 03:42 PM   #1
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Default Suggestions for beginner Power Amp design

Hello,

I'm new to the site and I've read with interest how you're building the pass labs amps.

Is there a power amp design that is fairly basic, low power (I have a pair of old wharfdale delta 50's, 75W), but has a fairly hi-fi sound?

Oh, and low cost! I'm looking at making my own pcb's so availabilty wouldn't be a problem if the gerber's exist. I've not built a whole amp before but have dabbled with modules and fixing bits of kit.

Have built many circuits, but just want something good and simple to start in hi-fi amplification.

Many thanks for any suggestions

James

Oh, after doing a search I listen to a lot of types of music, mostly industrial, experimental etc. you may wonder why I want a hi-fi power amp as some of it is just noise!

speaker sensitivity is 87 dB - is that good? what is that the ratio of? I'm guessing smallest possible difference in sound, so that sounds bad compared to 90+ figures :S

I have a lot of experience with building stuff, I could build pretty much anything, but don't want to launch into a massive project just yet.

Cheers!
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Old 5th February 2004, 05:48 PM   #2
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Try the Aleph-60 or 30.

http://www.passlabs.com/aleph.htm

Look for the service manuals. You can learn about them by reading the owners manual.

Vince
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Old 5th February 2004, 05:48 PM   #3
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Default Re: Suggestions for beginner Power Amp design

Hi James,

Welcome to the forum.
Quote:
Originally posted by spasmolytic
Hello,

I'm new to the site and I've read with interest how you're building the pass labs amps.

Is there a power amp design that is fairly basic, low power (I have a pair of old wharfdale delta 50's, 75W), but has a fairly hi-fi sound?

Oh, and low cost! I'm looking at making my own pcb's so availabilty wouldn't be a problem if the gerber's exist. I've not built a whole amp before but have dabbled with modules and fixing bits of kit.

Have built many circuits, but just want something good and simple to start in hi-fi amplification.
If your interested in the Pass designs I would suggest you start with the Pass Labs site and the Passdiy site . There is a lot of information there.
Quote:
Originally posted by spasmolytic
speaker sensitivity is 87 dB - is that good? what is that the ratio of? I'm guessing smallest possible difference in sound, so that sounds bad compared to 90+ figures :S
The sensitivity is typically a ratio of the speakers output SPL at 1W input (for 8ohm) or in general 2.83V to a very low reference pressure (which I don't remember the value). +3db is a doubling of the SPL.
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Old 5th February 2004, 08:46 PM   #4
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Thanks lads, i understand dB's but didn't know what it was with reference to!

I'll look into the aleph 3's I think, depending upon the complexity I might do something bigger.

Thank you!
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Old 6th February 2004, 12:31 PM   #5
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Aleph-30 is an updated version of the Aleph-3.
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Old 6th February 2004, 01:16 PM   #6
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ahh, i see that now thanks.

I can see that building a chassis as presentable as the others will take a lot of work!
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Old 6th February 2004, 02:43 PM   #7
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Without a doubt.
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