Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Cmoy first build questions
New Posts  All Forums:Forum Nav:

Cmoy first build questions - Page 2

post #16 of 60

Spot on :-)

 

cheers

FRED

post #17 of 60
Thread Starter 
Haha go me!
I saw that one of your Cmoys on eBay has 6600uf of power caps. Could I not put that in my cmoy?
post #18 of 60

Of course feel free

 

If I can do it so can you :-)

 

cheers

FRED

post #19 of 60
Thread Starter 

okay dokey. thanks. i was just wondering if you used a different setup or something, and mine wouldnt allow it.

Rob

post #20 of 60

The nice thing about Cmoy amps is that they can be heavily modified and customized.. what voltage are you using?

post #21 of 60
Thread Starter 

i dont think i will bother with the bigger caps.

1. too power hungry.

2. too big.

3. dont want to go overkill.

i am going to try the 220uf caps tho, just to experiment.

i have changed the sterio pcb socket in my basket for a panel mount one.

total cost per cmoy so far:

op amp:£4.50

pcb section:60p

components from rapid:£4.20

total:£9.30

not too bad :)

post #22 of 60

I tried 220uf and eventually went to 470uf as it made a large sound difference for a small sound difference.

post #23 of 60
Thread Starter 
I'm using 9v

Could you explain " large sound difference for a small sound difference"

Thanks

Rob
post #24 of 60

Crap that should read "a large sound difference for a small size difference"

 

And I'd recommend using 2 9volts to get a +/- 9v power supply, it'll give you a little more headroom.

post #25 of 60
Thread Starter 
Okay, I may do, but will the op amp run betters at 9 or 18v?
post #26 of 60

Well, if you are using the OPA2132:

http://www.mouser.com/search/ProductDetail.aspx?qs=7nS3%252bbEUL6umr%2FTUxeuLRg%3D%3D

you can see that it will tolerate up to a +/- 18v supply. That means you could use x4 9-volt cells to power it. They run well at most voltages, but I would use x2 nine volt batteries in order to achieve a +/- 9 supply. The battery life isn't really affected but they will most likely distort less at higher voltages.

post #27 of 60
Thread Starter 
Am using the opa2134, but it still has a +/-18v tollerance. I may go with your idea.
I will order up the parts in a week or two when I am back at school, as they have a rapid online account, and I shouldn't have to pay the ridiculous postage costs.
Thanks
Rob
post #28 of 60
Thread Starter 

i have just realised something: will the 10v caps work with an 18v supply? or is the voltage split by then?

thanks

Rob

post #29 of 60

To close for comfort, it will be split but 9 volts is very near to 10 volts, they will proberbly expire after a time

 

cheers

FRED

post #30 of 60

Its better to be safe and use 25v caps if you have room, then if one fails and all the voltage goes through one of them, you won't have to pick pieces of capacitor electrolyte out of your eyes. And trust me, they CAN explode! One of my coworkers almost got a tantalum cap to the face when it blew up after receiving 8 volts more than its rating. It was like the Fourth of July.

 

So its better to play it safe and use caps that could handle a short in your power supply, just in case.

New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Cmoy first build questions