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Starving Student PCB's - Page 9

post #121 of 222
Thread Starter 

Any chance of better pictures of both sides of the board?

 

its hard to see how you've wired it up

 

cheers

FRED

post #122 of 222

Wow, I love the idea of using a Mac Mini case as the housing on that. So pretty. How much did the whole setup set you back? And where would you pick up the housing like that, just had one lying around?

post #123 of 222

@RealSpark

 

In my boards one of the little squares that should indicate ground was wrong, I don't remember now which one it was, input or output, but if you trace the signals on the pcb you can see the mistake.

 

Looking at the pictures in the first page I think it was the input ground pad. It's actually the one facing the edge of the pcb instead of the one on the silkscreen.


Edited by Jose C - 11/23/13 at 9:53am
post #124 of 222
Quote:
Originally Posted by AxelCloris View Post
 

Wow, I love the idea of using a Mac Mini case as the housing on that. So pretty. How much did the whole setup set you back? And where would you pick up the housing like that, just had one lying around?

I bought all of the parts from China in one shipment. The Mac Mini case is 90 RMB, boy that is authentic mac mini case. I thought it is a fake one initially. The tubes are cost is 28 RMB each, free matching service. I bought one pair plus one for my other 12AU7 amp. A brand new 48V 2A power supply only for 20 RMB. Capacitor, resistors and all the other components cost about 80 RMB in total. Shipment to Singapore is about 40 RMB, only took 3 days and I got them. So in total it is about 60 SGD or 50 USD.  

post #125 of 222
Quote:
Originally Posted by MonkeyD.Luffy View Post
 

@RealSpark

 

In my boards one of the little squares that should indicate ground was wrong, I don't remember now which one it was, input or output, but if you trace the signals on the pcb you can see the mistake.

 

Looking at the pictures in the first page I think it was the input ground pad. It's actually the one facing the edge of the pcb instead of the one on the silkscreen.

You are right! My output is wrong. I soldered one channel to ground. Now its working totally fine! Cheers mate!

post #126 of 222
Quote:
Originally Posted by Fred_fred2004 View Post
 

Any chance of better pictures of both sides of the board?

 

its hard to see how you've wired it up

 

cheers

FRED

Its actually the output is wrong. I fixed it. The sound is perfect now. MonkeyD.Luffy is right, the input labelling is wrong. GND should be the outter one. 

Thanks Fred for the awesome PCB.

post #127 of 222

Howard my boards came today. Thank you. Now the fun starts and just in time for X-Mas.

post #128 of 222

What PS are you guys using? Would a really HF switcher work if I throw some huge caps, bypassed between +/-?


Edited by scootsit - 12/6/13 at 4:27pm
post #129 of 222

There are no mounting holes. How have you guys mounted it on the chassis.

The only thing i see is the pot that can be mounted, but is that mounting strong enough to hold the pcb and the tubes. I was actually thinking of ditching the pot, but looks like i might need it... Any issues with a 100k pot. I plan to use this with 32 ohm headphones.

Any particular reason why i see most of the people mounting the tube sockets on the other side.


Edited by doors666 - 12/8/13 at 7:02pm
post #130 of 222
Thread Starter 

There is plenty of room to drill mounting holes through the board, depending on the enclosure you are planning to use

 

I have used a 100K pot it seemed to work fine

 

the board was designed to have the tubes on the track side, if you put them on the other side all the connections will be mirrored - so not going to work :-)

 

cheers

FRED

post #131 of 222

I've seen a few calls/references to a BOM or parts list and having done the homework (and hopefully gotten it right:)  I created a 12AU7 PCB based list for Mouser.  The link is read only but if you see errors there, please let me know and I'll update so future finders of the thread don't have to recreate as it's very easy to make mistakes. In addition to this list, you'll need materials for a case and a 9 pin ceramic tube socket- I got some of the 9mm high ones off ebay and of course a couple of tubes and a power supply.


Edited by longslong - 12/9/13 at 1:28pm
post #132 of 222

Hey Fred, just to check with you. What will be the effects if i change some capacitors?  Like use 2.2uF caps? I have quite a few wima red caps laying on the ground.... 

post #133 of 222
Thread Starter 

I doubt that it will make any difference in reality. But if you have them around and the voltage rating is sufficient why not use them :-)

 

cheers

FRED

post #134 of 222

Hi,

I've seen both 24V and 48v used as power sources for this amp.  Which is proper?

Thanks

post #135 of 222
Thread Starter 

The 48V is the one to use

 

cheers

FRED

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