RancidM 0 Report post Posted September 13, 2006 I'd like to modify the amp so I can use a 12v DC wall adaptor and also be able to use my 9V battery. Obviously not both at the same time, is it possible for me to do this? What I'm thinking is to havea DC socket mounted on the box, but also a 9V battery plug inside the box too, so DC can be used at home, and 9V while i'm out (portable). Thanks gus! this page has a little info http://tangentsoft.net/audio/cmoy-tutorial...aks.html#dcjack i think i recall seeing a simular page talking about uisng the mains power to charge a rechargeable battery, but i might have been day dreaming. Share this post Link to post Share on other sites
heady 0 Report post Posted September 13, 2006 (edited) Okay guys, my amp is finished and I'm very happy with it!! Pictures are to come, its not quite in the enclosure yet you see. I do have a couple more questions. I'd like to modify the amp so I can use a 12v DC wall adaptor and also be able to use my 9V battery. Obviously not both at the same time, is it possible for me to do this? What I'm thinking is to havea DC socket mounted on the box, but also a 9V battery plug inside the box too, so DC can be used at home, and 9V while i'm out (portable). Thanks gus! Now back to this metal tin busines...I have taped down the metal case so the pcb can sit inside without shorting. Jason said something about making sure that the grounds of the headphone sockets should be shorted to the tin, if its mounted to the tin it should be grounded right? Or am i wrong? If i'm wrong does that mean i need to attatch a wire from the socket to part of the metal on the tin? Cheers guys, I appreciate the help for my amatuerness! Hi, RancidM has given you the link to show how to connect up two diodes so that you can use 12V DC or a 9V battery. To allow your 12V DC to charge the 9V battery, you need to add a regulator and a resistor. You can find details in the PINT pages in the same Tangent site. As for connecting ground to the tin, the simplest way, is to use non-isolated sockets for both the input and output and make sure these are mounted directly on the metal, without any insulation. Regards Edited September 13, 2006 by heady Share this post Link to post Share on other sites
Guest strumluff Report post Posted September 13, 2006 You wouldn't by any chance know if the ones I've bought here are non-isolated? http://www.maplin.co.uk/Module.aspx?TabID=...o=1189&doy=13m9 Thanks Rancid and Heady for the info regarding battery and DC, if I was to get a couple of diodes they'd be floating about in the box though I take it? Share this post Link to post Share on other sites
heady 0 Report post Posted September 13, 2006 (edited) strumluff, Re: the socket, it is definitely non-insulated, since it is fully metal. I guess you can use a perf board to mount the diodes and double side tape it to some where. Or just do it point to point and wrap them in insulating tape. You may have to ensure the DC connector is also insulated from the metal. Edited September 13, 2006 by heady Share this post Link to post Share on other sites
RancidM 0 Report post Posted September 13, 2006 try to stay away from insulting tape.... its well insulting.. get some of this instead.. http://www.maplin.co.uk/Module.aspx?Module...shrink&doy=13m9 Share this post Link to post Share on other sites
Guest strumluff Report post Posted September 13, 2006 (edited) I have some heat shrink lying around Point to point...that means connect the components together with wire? That seems like the easiest method. Edited September 13, 2006 by strumluff Share this post Link to post Share on other sites
RancidM 0 Report post Posted September 14, 2006 Point to point...that means connect the components together with wire? That seems like the easiest method. yep.... there are some pictures on the forums were people havnt bothered with a PCB at all and its all P2P... looks totaly confusing to me but technical theres no differancen i suppose. the PCB just makes it look neat. Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 14, 2006 As for the 12V supply. Make sure the source (CDP) is not sharing the same ground as your power adapter. Share this post Link to post Share on other sites
ClieOS 0 Report post Posted September 14, 2006 Second attempt: Share this post Link to post Share on other sites
RancidM 0 Report post Posted September 14, 2006 nice.... always satisfying to compleate a project... Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 14, 2006 Wow, nice. Have you tried opamp rolling? Share this post Link to post Share on other sites
heady 0 Report post Posted September 15, 2006 ClieOS, well done. Unique placement of the panel components. Enjoy your amp! Share this post Link to post Share on other sites
ClieOS 0 Report post Posted September 15, 2006 (edited) I have rolled quite a few opamps: OPA2134,OPA2227, OP270EZ/OP270GZ and OP275. So far i like OP270EZ the best. The one i just posted has OP270GZ in it. This amp will stay on my desktop, while the other one will go out with me. I fit ot in a spare box i got last time, pretty tight and no place for anything else... Edited September 15, 2006 by ClieOS Share this post Link to post Share on other sites
RancidM 0 Report post Posted September 15, 2006 whats the deal with the braiding of the audio cables ? is this something that should be done as often as possible #? Share this post Link to post Share on other sites
ClieOS 0 Report post Posted September 15, 2006 Not really know why people do it or would it have any effect of sound, i just doing it so i can manage them better... Share this post Link to post Share on other sites
