jasonhanjk 0 Report post Posted September 30, 2005 Of course. If it's too big than you need a bigger enclosure. Share this post Link to post Share on other sites
Username 0 Report post Posted September 30, 2005 You mean remove the LM6171 and replace with a rail splitter? Something like that... Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 30, 2005 Should be able to but have not try it out. You got both Cmoy2 board and TLE2426? I give you tips how to mock up. Share this post Link to post Share on other sites
dBu 0 Report post Posted October 3, 2005 Dear all, any way to incress the "gain"?? I feel that not "loud" enough.. TIA... dBu Share this post Link to post Share on other sites
Username 0 Report post Posted October 3, 2005 Should be able to but have not try it out. You got both Cmoy2 board and TLE2426? I give you tips how to mock up. Maybe in a few weeks time, I am currently working on making a custom cable for my 0404... And Recabling an incoming SR60 driver.... Soon.... Share this post Link to post Share on other sites
Kube 0 Report post Posted October 3, 2005 Ok...just built the thing...and now very irritated. I've got oscillations in my circuit, as in the 'whee' sound as mentioned earlier. Hmm...I wouldn't say my solder joints are bad, some of them might be slightly dirty and hence bulge a bit. The oscillations become inaudible, or go away, when I touch any of the output socket's pins. Also, I don't seem to get any volume increase. Using a 64ohm hd 280pro, and when I plug it in, I don't have a substantial increase in volume. Strangely, however, when I touch the joints for the resistors 2 - 8, I get the increase, but not by much. Regarding that....I sorta soldered both pads on either sides of the board for the resistors. For example, I soldered one of the legs of R5 on both sides? Is this ok? Using a 9V batt. Think the whole thing's screwed up? Share this post Link to post Share on other sites
heady 0 Report post Posted October 4, 2005 Did you try taking out the LM6171? The ground opamp is rather susceptible to oscillation. You will need to jumper as per the instructions. Share this post Link to post Share on other sites
Kube 0 Report post Posted October 4, 2005 Took out the ground opamp and jumpered the socket. Not much of a difference. Strange enough though, when I DID it out, and then put it back again, the oscillations were gone. However, it is perhaps that it's now inaudible, rather than an irritance I can hear. Also, with a gain of just 2, am I suppose to get a large increase of volume? To me, except for sound quality, the volume seems to be the same. Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted October 4, 2005 To increse the gain, increase the value of R2 and R6. You can try 30k. Kube, did you try to use a flux cleaner to clean the board? Share this post Link to post Share on other sites
Kube 0 Report post Posted October 4, 2005 Erm....flux cleaner? Uh oh. Share this post Link to post Share on other sites
Kube 0 Report post Posted October 4, 2005 One word of advice...NEVER USE ANY FORM OF TIN WIRES (Are they tin?). The ones that tend be not so malleable and break. Especially if you're troubleshooting. I had to resolder all my jumper wires with multistrand copper. Of course, in the process, I burnt one e-cap. I singed the cap, and though now all my connections are solid, my sound is still crap. I'm going to try replacing the lm6171 with the lm6181, and the opamp with a opa2228. Sigh....should I start over?... Share this post Link to post Share on other sites
dBu 0 Report post Posted October 6, 2005 To increse the gain, increase the value of R2 and R6. You can try 30k. Tks Jason... Share this post Link to post Share on other sites
kross 0 Report post Posted October 6, 2005 (edited) hi guys, went to Koba today to get some female jacks. the ones i bought were 'stero jacks' and they have 5 pins in them. however, I discover that only have OG, OL, OR holes. so can I still use those jacks or I have to buy those 3 pins ones? but the auntie say 3 pins jacks are mono jacks??? Jason, your schematic shows Vcc/2. so is the LM6171 outputs Vcc/2 and this Vcc/2 acts as the VG for the left and right opt -amp? cos quite confused when I saw both Vcc/2 are pointing outwards. Edited October 6, 2005 by kross Share this post Link to post Share on other sites
matt.pimm 0 Report post Posted October 7, 2005 (edited) Hi All, Have just built my cMoy2 amp. Was all going great, first time worker, until i used 12v instead of 9v. Parts I used 2x 1000uf 16v Pana's 5x 63v 1uf Wima Poly's 2x OPA2134 1x LM6171 8x 10kR 1% 0.4w 2x 10R 1% 0.4w 1x 50k log pot Now, my left channel doesnt work. Only sound you get out of it is when turning the volume up to full, and then very faint left, whilst very distorted right. I'm in the UK, so sourcing parts is fairly hard, Maplin is a joke, Farnell is decent but £20 min order. Is there any way to check the amp with a multimeter to find out which component is kaput?? I soldered my opamps instead of socketing, and ive lost my solder sucker, compressed air seems to work quite well tho. Any help will be much appreciated. Back of Amp Top of Amp Thanks in advance Matt Edited October 7, 2005 by matt.pimm Share this post Link to post Share on other sites
Kube 0 Report post Posted October 7, 2005 Caps or opamps. Not sure how to test them though. Kross: Goto LHS in SLT. There is an open back 3 pin female jack. Costs about 3dollars each. Share this post Link to post Share on other sites
