digi01 0 Report post Posted August 27, 2004 pic only: Share this post Link to post Share on other sites
digi01 0 Report post Posted August 27, 2004 top pic: Share this post Link to post Share on other sites
bpribadi 0 Report post Posted August 27, 2004 Beautiful Very nice silver amp But I prefer not to use plastick knob. Why not aluminium knob? It would match the box nicely Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 27, 2004 (edited) Edited August 27, 2004 by huangyong Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 27, 2004 (edited) Edited August 27, 2004 by huangyong Share this post Link to post Share on other sites
Afterburner 0 Report post Posted August 27, 2004 Very Nice You rock 'digi01' !!! Share this post Link to post Share on other sites
digi01 0 Report post Posted August 27, 2004 thank you Afterburner :") I will send out the amp weekend enjoys Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 27, 2004 (edited) digi01 is busy with his work, let me intro this amp... hmm....hmmm... The amp is based on "opamp + transistor" design and it is AC powered. Circuit design by digi01. All materials used are almost the best, and well mix and match by the experience DIYer to achieve the best sound at reasonable price. First of all, let me intro the "heart" of the amp, the famous OPA637 which receive rave reviews from headwize.com, smooth and silky sound as said. The transistors used in the output stage are 2 pairs of well match and rare transistors, A1007/C2800, working in AB mode. The input reisistors are Holcos, signal path using Philips percision resistors, output stage using CGW resistors. Whilst, the power supply using China made audio grade resistors. A blend of different resistors, instead of using only one type. Now, Caps story. A lot of different type of caps being used, even I got confused when digi01 send me a the part list. At the input stage, there is complicated RC filter invovle for bass boost; there are ERO (German made) 0.47uf caps, WIMA 1uF/63V and Silver Mica Caps.Interestingly, digi01 includes 2 very good Elan BP 200uf non-polar caps at the output stage. At the Power Supply, you can find 4 Elna Cerafine 100uf/63V caps, and a few huge Nippon Caps. The tranny is a China made PCB mount transformer. Thanks a lot.. That's all I know... pls fogive me if there's grammar mistake. Edited August 27, 2004 by huangyong Share this post Link to post Share on other sites
Afterburner 0 Report post Posted August 27, 2004 I cant wait to plug it in Share this post Link to post Share on other sites
Afterburner 0 Report post Posted August 27, 2004 My god.....the amp components are...... Circuit designed by himself ! Very Impressive ! Share this post Link to post Share on other sites
N@Z 0 Report post Posted August 27, 2004 digi01, for your next project, I would love to see some shots of your soldering work before you fix you circuit boards onto the enclosures. What do you use to decouple the base of the board from the metal enclosure? Share this post Link to post Share on other sites
Firefox 0 Report post Posted August 28, 2004 The input reisistors are Holcos I'm pretty sure those are Holco precision resistors. ie. They're not the older, better NOS but just your normal resistors with magnetic end-caps. Share this post Link to post Share on other sites
arj 0 Report post Posted August 28, 2004 Nevertheless. the amps look impressive. Any thought of releasing the amp design for those interested would-be DIYer. Share this post Link to post Share on other sites
