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Old 12th May 2013, 09:59 AM   #1
diyAudio Member
 
Join Date: Jun 2011
Question Some advice on powersupply for short list amp build

I have finally narrowed down my amp build to a short list of three. The amps will drive stereo 30W 8Ohm speakers I am yet to build - Visaton FRS8-8 full range (drivers freely available here).

My short list is:
- Standard LM3886 stereo amp - using better components
- MyRefC Siva v1.3 (found some boards on ebay that was excess)
- TDA7294 kit

I'm breaking the options down into cost now and part of that cost is the powersupply, and here I'm a bit in the dark - well in general I'm in the dark but more so with the power supplies.

I know for the standard LM and the TDA kits I need a transformer and a powersupply circuit. Can they all use the same transformer (24v-0-24v) and powersupply circuit, all three I mean? (Given a specific kit doesn't already include a power supply circuit).

Thank you kindly.

Last edited by Inprogress; 12th May 2013 at 10:07 AM.
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Old 12th May 2013, 10:24 AM   #2
AndrewT is offline AndrewT  Scotland
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160VA, 24+24Vac, or 160VA, 25+25Vac will do.
+-10mF to +-20mF of smoothing capacitors to each channel. (that's a total of 40mF to 80mF for a stereo amp).
A 1C/W heatsink will probably be OK, if you get cool air to it.
Heatsinks in India generally run hotter than in Britain.
Internal heatsinks generally run hotter than external.
Learn how to make your amplifier safe to use.
Learn how to make your amplifier safe to build.
Learn how to test your amplifier.
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regards Andrew T.

Last edited by AndrewT; 12th May 2013 at 10:45 AM.
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Old 12th May 2013, 10:25 AM   #3
AndrewT is offline AndrewT  Scotland
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Download and read the datasheets for your chipamps. They specify the range of operating voltage.
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Old 12th May 2013, 10:57 AM   #4
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Just had that "duuuuh" moment....I'll look at the data sheets. Thanks for the advice though Andrew.
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