Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › slight CK2III problem.. no signal
New Posts  All Forums:Forum Nav:

slight CK2III problem.. no signal

post #1 of 13
4/16/10 at 11:56pm
Thread Starter 
Hey guys, i just finished my Ck2III but am having a slight problem. i did all the initial checks and biased the current to about 14mv and so far everything seemed ok.
However i am unable to hear anything in my headphones, i have double checked the signal connections and they seem to be right. I hook up the jack inputs to the alps pot inputs. then wire the alps outputs to the respective signal inputs on the board correct?
here are some pics to see if maybe i wired something wrong..
Photo Albums - Imgur
the left side on the alps pot pcb is the output, the rt side is input from the jack. ( the little black thing in the upper left of 1st pic is the 3.5mm jack im using for my input currently..)
Reply
post #2 of 13
4/17/10 at 12:22am
The signal and ground inputs are wired backward
(check the schematic against the PCB, the left channel input connects to R1, the right channel input connects to R25)
Reply
post #3 of 13
4/17/10 at 12:43am
Thread Starter 
hmm, ok so i checked schematic again and switched the wires around, but still am getting silence. any other suggestions?
Reply
post #4 of 13
4/17/10 at 1:06am
Do you want the whole list of suggestions or just the most obvious problem?
Take a look at the headphone jack... do you have the wires soldered to the terminals that are making contact with the plug when it's inserted?
Reply
post #5 of 13
4/17/10 at 1:07am
particleman14, your link results in:

503 Service Unavailable
No server is available to handle this request.
Reply
post #6 of 13
4/17/10 at 2:21am
Thread Starter 
Quote:
do you have the wires soldered to the terminals that are making contact with the plug when it's inserted?
No they were on the other side. such sharp eyes. It probably would have taken me hours to figure it out. The amp appears to be in great working order now.

thanks again Misterx. I always appreciate your timeliness and courtesy when helping out the new guys like myself

here is a prelim pic in my temp case. http://imgur.com/jKvPr.jpg
Reply
post #7 of 13
4/17/10 at 3:41am
What, no aluminim foil for electrostatic shielding?

Seriously, you should congratulate yourself for meeting the challenge.

Also could you identify the transformer by brand and model? TIA
Reply
post #8 of 13
4/17/10 at 3:56am
Thread Starter 
I used the recommended one from amb's ck2III page.

Power transformer

* Amveco 15V+15V dual-secondary 7VA toroidal transformer TE62033
(Digi-Key TE62033-ND)
Reply
post #9 of 13
4/17/10 at 5:19am
Thanks for the info, I thought it looked rather small and neat (7VA, 21.5 mm high x 47mm diameter). I recently bought a Triad VPT30-830 which is less costly but somewhat larger (25VA, 32mm high x 71 mm diamater).
Reply
post #10 of 13
4/17/10 at 5:30am
Quote:
Originally Posted by particleman14 View Post
No they were on the other side. such sharp eyes. It probably would have taken me hours to figure it out. The amp appears to be in great working order now.

thanks again Misterx. I always appreciate your timeliness and courtesy when helping out the new guys like myself

here is a prelim pic in my temp case. http://imgur.com/jKvPr.jpg
I love your case! I need to get some quick-connect (or whatever they're called) things and A crimper, as it's really hard to try and reuse them.

The Amveco transformer is really tiny. I was surprised. How much would it benefit to put some (grounded) aluminum foil (or whatever) between the transformer and the rest?
Reply
post #11 of 13
4/17/10 at 5:38am
Quote:
Originally Posted by dorkvader View Post
How much would it benefit to put some (grounded) aluminum foil (or whatever) between the transformer and the rest?
None. Aluminum does nothing to shield against magnetic fields.
Reply
post #12 of 13
4/17/10 at 6:06am
What do they call that stuff?
Mu metal or something along those lines...
Reply
post #13 of 13
4/17/10 at 6:59am
Thread Starter 
hah.. ya dorkvader looks like cardboard cases are getting popular.. we should get a thread going lol./
Reply
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › slight CK2III problem.. no signal