I still haven't done actual measurements 🙁 but after "burning in" the amp for about 20 hours (continuously playing music) it seems to be more balanced. It still seems too bright but isn't as annoying as it was out of the box.
I don't believe it is because I'm getting used to the sound since during the burn-in period it was connected to dummy loads rather than speakers so I didn't actually hear it during that period.
I don't believe it is because I'm getting used to the sound since during the burn-in period it was connected to dummy loads rather than speakers so I didn't actually hear it during that period.
I just bought a two channel amp from Sure , and also a 24 v 14.6A SMPS, all for a total of £50 inc postage. I dont mind if the Amp isnt all that, as the SMPS will do for my autocostriuire T100hcl board.
Im banking on getting it next month, so no panic as yet🙂
if it works well enough for monitoring a small studio, its a bargain😀
Im banking on getting it next month, so no panic as yet🙂
if it works well enough for monitoring a small studio, its a bargain😀
I can confirm that this amp is definately more powerful on 25v... Thier SPMS arrived today, and it seems good. I haven't tested it for ripple yet tho.
Now, I was playing my iriver thru it, and I turned my iriver off before the amp, and the amp started to play 50hz hum thru the speakers!
I think this was due to my iriver being plugged into the mains charger.
Anyway, I turn the amp off straight away, and some white smoke came out from below the heatsink. 
😱
Now everytime I play teh amp, I can hear 50hz hum thru it.. 🙁 Have I burned out a resistor, or worse, damaged to chip? What's the easiest way of removing the heatsink?
Now, I was playing my iriver thru it, and I turned my iriver off before the amp, and the amp started to play 50hz hum thru the speakers!
I think this was due to my iriver being plugged into the mains charger.Anyway, I turn the amp off straight away, and some white smoke came out from below the heatsink.
😱 Now everytime I play teh amp, I can hear 50hz hum thru it.. 🙁 Have I burned out a resistor, or worse, damaged to chip? What's the easiest way of removing the heatsink?
Hi sharpi31,
As you quote: "Mine produced a significant amount of hiss on all channels (when used with Rogers LS5/9 speakers - hardly super-efficient)."
I am just wondering about the impedance of your speaker?
The d-class amp has disadvantage if your speaker have high impedance. Not just lowering the output but reducing the filter of switching frequency also. If the output filter has been set for 4 ohms load, it will work less with 8 ohms or more ohms load.
I believe the hiss was the resonant of switching frequency.
Cheers
Yamin
As you quote: "Mine produced a significant amount of hiss on all channels (when used with Rogers LS5/9 speakers - hardly super-efficient)."
I am just wondering about the impedance of your speaker?
The d-class amp has disadvantage if your speaker have high impedance. Not just lowering the output but reducing the filter of switching frequency also. If the output filter has been set for 4 ohms load, it will work less with 8 ohms or more ohms load.
I believe the hiss was the resonant of switching frequency.
Cheers
Yamin
for some reason, I dont think my sh!t is coming...
i was just looking through my email inbox, of messaged, which I never delete, and found one from "sure electronics"
apparently, they weren't happy with the postage amount that ebay calculated, and wanted more money before they sent my item....
this was a week ago...
for some reason, I dont think my item has been sent yet...
i was just looking through my email inbox, of messaged, which I never delete, and found one from "sure electronics"
apparently, they weren't happy with the postage amount that ebay calculated, and wanted more money before they sent my item....
this was a week ago...
for some reason, I dont think my item has been sent yet...
so, I paid for the items on the 5th... didn't get a reply from them till the 14th to tell me that I hadn't paid enough...
now, thats pretty sh!tty customer service if you ask me...
now, thats pretty sh!tty customer service if you ask me...
What kind of power output can you expect at 12 volts? Rough calcuations gave me around 25 watts per channel??? Am I anywhere close???
For those who have this amp, how is the quality? (construction and sound)
Thanks in advance,
Mike
For those who have this amp, how is the quality? (construction and sound)
Thanks in advance,
Mike
Magicdj said:
Not really.
W=(V^2*%)/Z*2
That's watt per channel, supply voltage, amplifier efficiency in decimal (80%=.80), and impedance respectively.
That's absolute maximum peak power at 20% TDH. The peak power at 1% is around 2/3rds of that.
Usable power into 4 Ohms, when powered from a car battery supply (14V) is about 16W per channel.
Just for info - I ordered 3 amps on the 9th, status was updated to shipped on 14th and 3 amps arrived in the UK this morning - well packed.
There is some flux on bottom of the boards, partially cleaned though. Accessory packs are a nice touch, manuals are a joke! (But that does not affect this readership.) I guess I should look at some component values before testing though, just to be "sure".
Ken
I changed the 1uF ceramic caps in the output Zobel networks to 7.5mm-pitch stacked-foil types on my board. (Only because I didn't like the idea of Y5V dielectric caps in the audio path).
It's one hell of a job desoldering components on these boards. The tracks are really thick and there's no thermal-relief on the plated-through holes, so all the heat from the soldering iron gets diverted into heating up the copper!
It's one hell of a job desoldering components on these boards. The tracks are really thick and there's no thermal-relief on the plated-through holes, so all the heat from the soldering iron gets diverted into heating up the copper!
I got mine today! I ordered a 2 ch and got a 4ch...oh well.
I like it so far, with a 16V supply I was getting a descent 15Vrms sine wave out. Thats pretty efficient IMO.
Hmm has anyone tried paralleling the outputs, bridging won't work. And what resistors should be used. I have some 0.5R ones. Also, will it handle a 1R load with the outputs paralleled?
I like it so far, with a 16V supply I was getting a descent 15Vrms sine wave out. Thats pretty efficient IMO.
Hmm has anyone tried paralleling the outputs, bridging won't work. And what resistors should be used. I have some 0.5R ones. Also, will it handle a 1R load with the outputs paralleled?
I orederd a a 2 channel one and got a 4 channel amp as well
. doesnt matter though,, Im more impressed with the SMPS, for £25 i got. Although i will be rigging it all up later
. doesnt matter though,, Im more impressed with the SMPS, for £25 i got. Although i will be rigging it all up laterI've read through this now and I'm getting a mixed rating on this thing as a music amp. What I'm looking for though is an HT amp for ordinary TV watching as my HT receiver has lost 2 channels so far. Is this thing worth buying for that purpose?
My alternate plan is to just buy a Panny XR57 and be done with it as I could do that today and have it working tonight rather than wait for an unreliable source and then have to build it into something. I think I just answered my own question.
My alternate plan is to just buy a Panny XR57 and be done with it as I could do that today and have it working tonight rather than wait for an unreliable source and then have to build it into something. I think I just answered my own question.
i will be honest its not a great amp for hifi, i have a couple of tripath projects and this does not have the insight, detail or or timing. but what the stock board has on both my small test speakers, and klipsch horns, are very solid, bass with an SMPS, and slightly forward but greyish midrange. Its not subtle enough for serious listening/evaluation, but hey....
for the money i paid im still very happy😀
for the money i paid im still very happy😀
Just to update from some serious loud playing on my Klipsch and Ah Njoe Tjoeb, this thing is very impressive. I take back what i said earlier. couple it with an able SMPS, and it can sound pretty bloody good.
next week of course , it will sound sh*t
next week of course , it will sound sh*t
Looking for advice on a power supply for the sure 2 channel.
Would like specific models/brands if possible.
Thanks
Would like specific models/brands if possible.
Thanks
got both of my amps today (had to pick em up at the post office as my mail carrier does not leave packages without signatures). inspected both and they seem to have done a better job on soldering, as there is much less flux mess on the boards than i've seen in some of the other pictures. i do like the additional parts included (banana plugs, cables, etc), nice little freebie.
while looking around for the rest of my setup, i figured i'd pass along some other deals i found.
case: this thing seems to be very nice for the price and i'm talking with the seller now, as it seems like they have a few options available. also checking on quicker shipping.
RCA's: these guys seem to have a ton of these available and seem to be a great deal for a decent looking set.
as for the PS, i think i'll be going with two of the 24v 6a SMPS's from sure electronics, as they seem to be a heck of a deal again.
as you can probably tell, i'm going for the less expesive route, but if anyone has some better suggestions on parts or supplies, i am all ears. can't wait to get this done, along with a 5,6, or 7.1 Triune setup for my home theater. gotta love DIY!
while looking around for the rest of my setup, i figured i'd pass along some other deals i found.
case: this thing seems to be very nice for the price and i'm talking with the seller now, as it seems like they have a few options available. also checking on quicker shipping.
RCA's: these guys seem to have a ton of these available and seem to be a great deal for a decent looking set.
as for the PS, i think i'll be going with two of the 24v 6a SMPS's from sure electronics, as they seem to be a heck of a deal again.
as you can probably tell, i'm going for the less expesive route, but if anyone has some better suggestions on parts or supplies, i am all ears. can't wait to get this done, along with a 5,6, or 7.1 Triune setup for my home theater. gotta love DIY!
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