Is that a mono PBTL on left ? They gave you a volume knob? These amps have higher 32dB gain which is a bit much for line level drive but great for MP3 players and phones. Interested in what you think of sound quality.
Standard for middle board is 26dB I believe, option is 32dB by soldering a bridge on bottomside, could be reversed for some suppliers? 26dB with cd level input is too much especially here with 50k linear pot volume control, noiselevel usable part pot is high, turning pot further noiselevel goes down, but you need lowlevelinput to ever get there.
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I purchased 4 of these. I just got two of them running, one per channel this afternoon. The PCBs are still connected to one another.
There is some hiss when one puts his ear to the speakers. Sound quality is ok, comparable to the YJblue I have if one ignores the hiss (and the electronic high pitched hum of the YJ blue).
I plan to place one module in a portable enclosure (kinda like the Boominator, but without the frills) with a battery and four 8" 8ohm fullrange speakers and a 3.5mm input jack for a cellphone player.
I purchased 4 of these. I just got two of them running, one per channel this afternoon. The PCBs are still connected to one another.
There is some hiss when one puts his ear to the speakers. Sound quality is ok, comparable to the YJblue I have if one ignores the hiss (and the electronic high pitched hum of the YJ blue).
I plan to place one module in a portable enclosure (kinda like the Boominator, but without the frills) with a battery and four 8" 8ohm fullrange speakers and a 3.5mm input jack for a cellphone player.
Paugie, interesting cards you have there. Looks like a good card for some light mods🙂
It looks like the output filter is tuned to 4 ohm because of the chokes markings. Also if you put a good smd capacitor in parallel with c11 the noise would be less🙂
How much did you pay for one card inc shipping btw?
I have a similar procject going on and I'm using a bluetooth APT-X card for wireless streaming to my boombox, http://www.ebay.com/itm/311086257831?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT. I haven't tried it yet but the specs looks really good!
It looks like the output filter is tuned to 4 ohm because of the chokes markings. Also if you put a good smd capacitor in parallel with c11 the noise would be less🙂
How much did you pay for one card inc shipping btw?
I have a similar procject going on and I'm using a bluetooth APT-X card for wireless streaming to my boombox, http://www.ebay.com/itm/311086257831?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT. I haven't tried it yet but the specs looks really good!
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Thank you, impuls60.
The markings are the same as the YJ, "100" on the inductors. Supposedly the YJ is tuned for 8ohm speakers. I am running these on a pair of Tannoy Mercury V1i bookshelves which are 8ohm.
Despite having no heatsinks, the chips are only perceptively warm. Maybe because my living room is small and doesn't need a lot of power for satisfying volume. Still, I am thinking of bolting a piece of aluminum across the chips, there seems to be provision for such.
I have almost zero DIY skills and the two soldering tools I purchased are a pain, they don't seem to output enough heat. I've purchased these small amps to counteract electricity bills to please the wife. I'd love to mod the YJ's but I need to find a good soldering pencil first.
Irribeo, I attenuate the output of the DVD player which feeds the 2-tube "preamp" before it goes into the Taobao amps.
The hiss is constant, not affected by adjustments in the pre-amp volume knob.
The markings are the same as the YJ, "100" on the inductors. Supposedly the YJ is tuned for 8ohm speakers. I am running these on a pair of Tannoy Mercury V1i bookshelves which are 8ohm.
Despite having no heatsinks, the chips are only perceptively warm. Maybe because my living room is small and doesn't need a lot of power for satisfying volume. Still, I am thinking of bolting a piece of aluminum across the chips, there seems to be provision for such.
I have almost zero DIY skills and the two soldering tools I purchased are a pain, they don't seem to output enough heat. I've purchased these small amps to counteract electricity bills to please the wife. I'd love to mod the YJ's but I need to find a good soldering pencil first.
Irribeo, I attenuate the output of the DVD player which feeds the 2-tube "preamp" before it goes into the Taobao amps.
The hiss is constant, not affected by adjustments in the pre-amp volume knob.
Yes, a mono board. That one came with a volume knob and the quick connect input cable. Wanted to use it for a small sub. It's 26dB, switchable to 32dB.
This board is "interesting". According to the website, it is designed to power a subwoofer (one). The claimed power output indicated it is in PBTL mode. Input signal is full range (20-20KHz) but output is 20-180Hz. Look like there is some kind of "filter" on board to cut out the unwanted frequencies.
I saw those sometime ago and am thinking of getting them. Interested to hear your comment on this board after some use. They look really tiny. There is another version (same PCB) but use cylindrical shaped output inductors coupled with a film cap (the vendor call it the luxury version). The version that you have use the usual square shaped SMD inductor and does not have the cap, not sure whether the absence of the cap is related to the hiss. I suspect that the hiss can be controlled by cut back on the gain.
Regards,
You actually can made out the value markings of the SMD resistors from the picture? I tried but the resolution of the picture was not high enough.
If the values that you mentioned are correct, that might be the cause of the hiss. The gain is way too high for typical uses.
I can confirm the above.
I plugged in an iPod, and a 12" speaker. It acted as a sub only. Up to about 180Hz.
So you are saying you should only hook the snubber to the side
Of the bootstrap that goes to the coils right?
I have seen photos where others have put the snubber
On the bootstrap that feeds the coils on those 2 outside bootstraps
And on the inside 2 caps to the side going to the chip?
I wonder if it matters?
Scott
Of the bootstrap that goes to the coils right?
I have seen photos where others have put the snubber
On the bootstrap that feeds the coils on those 2 outside bootstraps
And on the inside 2 caps to the side going to the chip?
I wonder if it matters?
Scott
Yes. Snubbers should be placed between capacitor and choke(coil). I put them on the leg of the capacitor thats on the coil side and then to ground. I've never heard of anyone connecting them differently.
[ I was thinking that was the correct way but looking at the schematic and some
Pictures guys have posted of the mod it looks like 2 are in the right
Spot and 2 are not unless I am missing something?
Thanks
QUOTE=impuls60;4291211]Yes. Snubbers should be placed between capacitor and choke(coil). I put them on the leg of the capacitor thats on the coil side and then to ground. I've never heard of anyone connecting them differently.[/QUOTE]
Pictures guys have posted of the mod it looks like 2 are in the right
Spot and 2 are not unless I am missing something?
Thanks
QUOTE=impuls60;4291211]Yes. Snubbers should be placed between capacitor and choke(coil). I put them on the leg of the capacitor thats on the coil side and then to ground. I've never heard of anyone connecting them differently.[/QUOTE]