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I've just built one of these RRR, 2x25W @4ohm running off a 12v battery!
[img] http://www.41hz.com/showgraph.asp?ID=217 [/img]
[url= http://www.41hz.com/shop/item.asp?catid=14&itemid=38 ]41Hz AMP32[/url]
I now prefer it to the 640a I bought off a mate at cambridge audio.
Cool!!!
It's interesting to see that it now works!
To be honest I've not worked in audio electronics for a long while... it was back in 2002 when I tried to build something similar for my dissertation.
Really impressive stuff though..
I'm intrigued by the lack of mahoosive heatsink too.. the ones I tested needed f£ck loads in order to remain stable..
What sort of load can you drive with that?
..sorry, just noticed you said 2*25W at 4ohm.... amazing really..
I might have to get one of those kits... shame they didn't exist when I was studying.. I might have got a First 😉
I haven't fitted a heatsink yet but it's been driving some gale mini monitors in my lounge pretty loud, and hasn't cut out so far! I'm planning to build a proper alu case soon whcih should do the job.
These are based on tripath chips, (class-t) who went bust apparently but loads of PCBS around using the old stock. I got one of these first off ebay
http://cgi.ebay.co.uk/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt_W0QQitemZ250538372097QQcmdZViewItemQQptZUK_AudioTVElectronics_HomeAudioHiFi_Amplifiers?hash=item3a55402c01
jahwomble the pa really wasn't for vocal reinforcement, the size of the room didn't warrant one, it was for their audio demos and therefore had too meet their exact criteria, hence we did not supply it for them.
in no hifi enthusiast - but I think anyone can tell on listening that even this fairly basic set-up is better than any mini system/ compact type thing you could buy for similar money
No, it's just the placebo effect, apparently... 😉