zer061zer0 0 Report post Posted December 6, 2007 My case up 1w amp, much thanks to Fuzzy bucket for he introduce me to the card amp. The case is from my old cmoy, look rather similar to jasonhansik cmoy in the cmoy constrcution thread. Share this post Link to post Share on other sites
bjderf 0 Report post Posted December 6, 2007 OK. Very nice picture. Thanks for sharing. Share this post Link to post Share on other sites
heady 0 Report post Posted December 6, 2007 Hi, Got more details of your card amp? Thanks Share this post Link to post Share on other sites
zer061zer0 0 Report post Posted December 6, 2007 its a very small pcb kitset offered by future kits, i sort of replace some parts but the end SQ is still not as good due to a slight hiss, but it makes a pretty nice gift for my frd. Share this post Link to post Share on other sites
mouz 0 Report post Posted December 7, 2007 nice, btw, is it this one? http://www.futurekit.com/detail.php?id=342 Share this post Link to post Share on other sites
zer061zer0 0 Report post Posted December 7, 2007 yes, thats the one, relatively easy to build you can wire in a volume pot instead of the trimmer. I also replaces some of the mylar parts with polyproplyene. Actually i have a question on the mylars and pp caps, what do they affect on the signal path. if say i incease the value what is the expected result(thoeretically and sonically) of it. Share this post Link to post Share on other sites
zer061zer0 0 Report post Posted December 7, 2007 Anyway this is another varient that i have created included a wire pot. 1watt Octopus amp (uncased) Share this post Link to post Share on other sites
mouz 0 Report post Posted December 9, 2007 nice, makes good for opamp rolling too Share this post Link to post Share on other sites
Fuzzy Fuzzbucket 0 Report post Posted June 3, 2008 hi all!! haha back from a very long break the future kit company has another kit for headphones http://bp3.blogger.com/_JmXRll445GA/SEAdIz...-h/DSC01419.JPG i used tantalum caps instead and tiny boxed polyester caps value at 0.22 rather than stated design at 0.1 new layout also hoho Share this post Link to post Share on other sites
mouz 0 Report post Posted June 3, 2008 (edited) nice, any idea what opamp this new kit is using? Edited June 3, 2008 by mouz Share this post Link to post Share on other sites
Fuzzy Fuzzbucket 0 Report post Posted June 3, 2008 not an opamp its TDA2822 haha Share this post Link to post Share on other sites
mouz 0 Report post Posted June 3, 2008 Made the same kit that zer061zer0 made but the noise was quite bad if you're using it as a headphone amp, but quite ok if you use it power those little portable speakers. Can't really seem to get rid of the noise even with higher resistor values or cap change. How's this one? Share this post Link to post Share on other sites
Fuzzy Fuzzbucket 0 Report post Posted June 3, 2008 if you're talking abt the notorious hissing i dont have an answer i use it outside n with open phones haha the hiss not prominent then zer061zer0 came up with a solution he did tell me but sadly i didnt write it down anywhere back then according to him he didnt notice the hissing with high impedance phones why not you ask him? all i can recall is that short 100 ohms resistors on both channels but i cant remember whether its at the input stage or the output Share this post Link to post Share on other sites
mouz 0 Report post Posted June 4, 2008 hmm... worth giving it a try, funny thing i notice if i shield the circuit with my hands from my lamp, the hums goes away. Share this post Link to post Share on other sites
heady 0 Report post Posted June 4, 2008 hmm... worth giving it a try, funny thing i notice if i shield the circuit with my hands from my lamp, the hums goes away. If your lamp is fluorescent, then it is not unusual. Fluorescent lamps throw out lots of RF due to its design. If your eyesight is extremely good, you will notice that the lamps actually flicker at a very high rate. For most of us we can't see this until the lamp gets old. So it means you need a good Faraday cage for your amp. Share this post Link to post Share on other sites