jasonhanjk 0 Report post Posted September 27, 2004 Hey guys. After a long wait from Bulgaria, my prototype board had arrive. Not for sale though 'cos it is too expensive. Enjoy the pics!!! Share this post Link to post Share on other sites
bpribadi 0 Report post Posted September 27, 2004 Looks like the A47 you are building... is it? Why do you have to order them from Bulgaria? Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 27, 2004 Cheaper there. Each for S$12.50, I buy 6. Ya BRAM, YGPM. Share this post Link to post Share on other sites
bpribadi 0 Report post Posted September 27, 2004 I see... Have you asked Digi01? He might be able to help us with the board. I will look for some info, probably in Indonesia you can get it cheaper. Share this post Link to post Share on other sites
tropicalrips 0 Report post Posted September 27, 2004 looks very "pro" u put in the holes for the mounting stubs on the case is that the mini alps pot? Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 27, 2004 I have not ask him yet. Will do this few days. China would definately be cheaper. Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 27, 2004 Yup. Too bad the PCB is a bit big due to cheaply made. Have to file a bit to get it in. Share this post Link to post Share on other sites
N@Z 0 Report post Posted September 27, 2004 Hey guys. After a long wait from Bulgaria, my prototype board had arrive. Not for sale though 'cos it is too expensive. Cheaper there. Each for S$12.50, I buy 6. Contradicting yourself here. Share this post Link to post Share on other sites
bpribadi 0 Report post Posted September 27, 2004 I guess what he meant is, too expensive for the SGD 40.- he proposed earlier, but compare to other sources, he got it cheaper from Bulgaria (but not cheap enough for the budget amp). Am I right Jason ? Share this post Link to post Share on other sites
digi01 0 Report post Posted September 28, 2004 good,jason do you use plastic pcb stand-off holes?just like PC main board. cheers Share this post Link to post Share on other sites
digi01 0 Report post Posted September 28, 2004 BTW,jason, I am glad to help you make pcb,BEIJING pcb factory at cheap price wtih good quality.but you have use protel to draw. Share this post Link to post Share on other sites
arj 0 Report post Posted September 28, 2004 Jasonhanjk: Did you design the pcb and get the factory in Bulgaria made it for you for 6 no. only!!!!... Hem....interesting. Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 29, 2004 (edited) Oops. I am too tired that day after getting the PCB and solder it, end up replying without much thinking. It is cheaper to get from olimex for small quantity PCB. http://www.olimex.com/pcb/index.html Since it is a prototype, I should only made in small quantity to check the quality of the design. Once the design is finallise, I'll go for mass production that can reduce the cost down to $5 each. Mass production will require bigger capital, at least $500. I don't recommend members to buy from me now because they will be paying extra money. Yes arj. Self design and send to them in Bulgaria. You can give them in eagle brd format. Here are the resistor value: R1 10 R2 10 R3 91k R4 33k R5 33k R6 10 R7 10 R8 91k R9 33k R10 33k R11 10 R12 0 ohm R13 10k R14 10k R15 2k Edit R12. Edited October 3, 2004 by jasonhanjk Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 29, 2004 Just do a RMAA, or the so called technical spec. The results below shows it is an ok amp, not the best but an ok amp. Frequency response (from 40 Hz to 15 kHz), dB: +0.05, -0.19 Very good Noise level, dB (A): -87.5 Good Dynamic range, dB (A): 87.5 Good THD, %: 0.029 Good IMD, %: 0.032 Good Stereo crosstalk, dB: -83.0 Very good IMD at 10 kHz, %: 0.030 Good Share this post Link to post Share on other sites
jasonhanjk 0 Report post Posted September 29, 2004 Nope DIGI. I plan to use tap screw since there is already a BOSS there. Don't ask me what is a BOSS 'cos i am not quite sure myself. Share this post Link to post Share on other sites