This was discussed briefly under the thread "Class D on ebay". Nobody in that thread had bought one yet--just guesses as to what chip is used. The single supply suggests a TI chip, but it's got an analog input, which means it probably isn't TI.
I put one on order Oct 26. When it comes in I'll dissect it and post results.
I put one on order Oct 26. When it comes in I'll dissect it and post results.
According to the drawing there is only one large device under the heat sink. I would guess that it might be a Sanyo STK series chip.
Photos
I'm not going to try to take the heatsink off, but here are some photos. It'll be a while before I can really give it a listen, but it works and has me curious.
The main chip is one large device.
Photos of Sure 4 Channel Amp
I'm not going to try to take the heatsink off, but here are some photos. It'll be a while before I can really give it a listen, but it works and has me curious.
The main chip is one large device.
Photos of Sure 4 Channel Amp
Almost certainly a Sanyo STK428-xxx 'Ice-Power' module. I've tested their two-channel module (STK430-428) and it's a nice performer, though the frequency response alters noticeably with load impedance.
Though this one looks like a single-supply (+24V) version. (My Sanyo data for this range is a couple of years old and doesn't show a full-bridge, single-supply. single-rail module at that time.)
Is this it, or half of it anyway ?
http://www.comprel.it/scheda_prodotto/data_sheet/news1476.pdf
PS I ordered one and a 24V switch mode power supply and they arrived today. Will have a listen at the weekend..
http://www.comprel.it/scheda_prodotto/data_sheet/news1476.pdf
PS I ordered one and a 24V switch mode power supply and they arrived today. Will have a listen at the weekend..
Re: Photos
Hmmm...I would have taken off that heatsink within 5 minutes of opening the package.
Inquiring minds need to know!
Mine was supposedly shipped on Nov 1 but it hasn't shown up yet.
buzz1939 said:
Hmmm...I would have taken off that heatsink within 5 minutes of opening the package.
Inquiring minds need to know!Mine was supposedly shipped on Nov 1 but it hasn't shown up yet.
Just ordered one of these myself. I've got a couple PS to test with but if I like it I'll likely end up building a supply.
Re: Re: Photos
Mine was also shipped the 1st - I think they finally got them in stock then - and arrived in Boston on the 6th, kind of surprising.
I guess I wasn't curious enough, I didn't want to mess with potentially stripping and replacing the thermal paste or whatever might be in there. At least until I've had a chance to listen to it for a while.Neil Davis said:
Hmmm...I would have taken off that heatsink within 5 minutes of opening the package.
Mine was supposedly shipped on Nov 1 but it hasn't shown up yet.
Mine was also shipped the 1st - I think they finally got them in stock then - and arrived in Boston on the 6th, kind of surprising.
If the power-amp package is the same as the other Sanyo STK428 range, then taking the heatsink off won't help! My STK428-430 only has the markings on the underside of the package. The top side is all exposed metal to thermally couple to the heat sink.
That's usually measured at a much higher frequency, IIRC. 1 khz or so. And with more distortion than you'd really accept. Very different results at low frequencies on this one.
I asked the eBay seller what manufacturer made that chip and the response was that it was "custom."
Dear xxx,
Thanks a lot for your letter. This amplifier assembled a custom module, did not use amplifier chips. Feel free to contact us if you have any questions.
Best wishes.
Sure Electronics
Dear xxx,
Thanks a lot for your letter. This amplifier assembled a custom module, did not use amplifier chips. Feel free to contact us if you have any questions.
Best wishes.
Sure Electronics
I got the same response. It struck me as somewhere between unlikely and impossible - what do people think?
Back to the power rating for a minute, it's listed at 100W in the title, but that's probably at 10% THD or something. Spec is 75W / ch with 1% THD into 4 ohms. And typically that's an exaggerated number, under ideal conditions (at the frequency that gives the highest output), rounded up.
BTW, any thoughts on how to bridge this? Nothing that will short it out, since I'd be stupid enough to try it without knowing what I was doing.
Back to the power rating for a minute, it's listed at 100W in the title, but that's probably at 10% THD or something. Spec is 75W / ch with 1% THD into 4 ohms. And typically that's an exaggerated number, under ideal conditions (at the frequency that gives the highest output), rounded up.
BTW, any thoughts on how to bridge this? Nothing that will short it out, since I'd be stupid enough to try it without knowing what I was doing.
buzz1939 said:
It is already bridged, hence the single supply and two inductors per channel.
You might be able to parallel the channels for more current with low impedance loads.
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