jasonhanjk 0 Report post Posted June 17, 2003 Here are some sneak preview of my CLONE PPA... I just do a Rightmark test on my CLONE PPA and here is the result: Frequency response (from 40 Hz to 15 kHz), dB: +0.00, -0.00 Noise level, dB (A): -94.5 Dynamic range, dB (A): 92.1 THD, %: 0.0033 IMD, %: 0.043 Stereo crosstalk, dB: -94.9 I am using my HD600 for loading. Still lose to the original PPA a bit: http://www.tangentsoft.net/audio/ppa/bench...-1x-buffers.htm If you want to have a test on this amplifier, do come down to PIPEE's home!!! Share this post Link to post Share on other sites
ablaze 0 Report post Posted June 17, 2003 moving this to the main forum. (DIY goes there) btw, that looks good jason. how's it different from an actual PPA btw? Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted June 17, 2003 Scared me. I thought delete liao. Sound wise cannot ask newbie. I let you all have a try!!! The internal parts consists of: {PPA original config with curly bracket} Power from 4 AA batteries total 4.8V or PC internal 5V or 9V battery {PPA uses 18 AAA batteries} DC-DC converter (output +12V, -12V & 0V) {don't have this from the original design} 3 capacitor {more than 10} No volume adjust at the CLONE OPA134PA {AD8610} 3 buffer {12 buffer} Add big heatsink {no heatsink} These are the majour ones, something like an expensive Cmoy. Share this post Link to post Share on other sites
N@Z 0 Report post Posted June 17, 2003 Is the reason you called it a clone PPA due to using the circuit layout? Share this post Link to post Share on other sites
Rameish 0 Report post Posted June 18, 2003 How does that make it a clone PPA - however if it sounds good way to go! Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted June 18, 2003 I cannot call it a PPA since PPA is actually a PCB. I use the term clone as I uses it's schemactic... Share this post Link to post Share on other sites
N@Z 0 Report post Posted June 18, 2003 What we all want to know now is can you build one as soon as the details become firm! Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted June 18, 2003 At least one month with 100% built to spec. No promise though as some parts are very hard to find in Singapore. AD8610 is the hardest of all... Share this post Link to post Share on other sites
N@Z 0 Report post Posted June 18, 2003 Sadly also, there is the small matter of cost... Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted June 18, 2003 (edited) ~Cheap no good, good no cheap~ Confucius For something better of course will be more expensive. Anyway my spec had already beaten the meta42 on results. If you like it I can build another CLONE at a cheaper price of course, casing not included Edited June 18, 2003 by jasonhanjk Share this post Link to post Share on other sites
fishball79 0 Report post Posted June 18, 2003 Jason, If many wants the yr amp im sure they are willing to pay for your efforts. This also allows you to scour online for parts u need. Shipping cost wouldn't be much if ur talking about a dozen opamps... they'd probably send them in a tube in an envelope... Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted June 18, 2003 Lol... If more than 5 people want at a time can be very cheap. Let's see how this Saturday and talk the possibilities. Is there any other senior DYIers around here? Share this post Link to post Share on other sites