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Happy New Year!


micaddict

Re: Official C12 Clone - Build and Support Thread
« Reply #2260 on: January 07, 2017, 07:28:36 AM »
Hey everyone, it's been quite awhile since I posted.

Yeah, but we haven't forgotten you.
Good for us you ran into some trouble.  ;)
Nah, just kidding. This sucks, of course.
But good to see you.  :)


Re: Official C12 Clone - Build and Support Thread
« Reply #2261 on: January 07, 2017, 12:50:19 PM »
Yeah, but we haven't forgotten you.
Good for us you ran into some trouble.  ;)
Nah, just kidding. This sucks, of course.
But good to see you.  :)
Ha! Good to see some familiar people still here. I'm afraid my interest in DiY mics had to submit to my lack of time over the past couple years. In turn, I wasn't at the forum for awhile. I still have Max's kit for  a U47 that I never even opened, as well as an unused CT12 capsule.

Most likely moisture in the capsule .
Try sealing it in a bag with desiccant bags for a few days to absorb and excess moisture.
It could also be dirt in a switch or contamination from fingers or flux somewhere. Leave the mic turned on for a few hours and see if it disappears.
Thanks for the tips guys!

As a first step, I put the mic in its pouch with a couple of silica gel packets overnight. I just plugged it in to test again, and now I'm getting no sound at all. The PSU is turning on, and I can see the meters jump on my audio interface when I turn the PSU on (or when I power down and unplug the 7-pin cable), but I'm getting no signal at all from the mic. Again, the only thing I did was store it with silica gel packs overnight. I am thoroughly confused.

vinylwall

Re: Official C12 Clone - Build and Support Thread
« Reply #2262 on: January 07, 2017, 01:37:44 PM »
Ha! Good to see some familiar people still here. I'm afraid my interest in DiY mics had to submit to my lack of time over the past couple years. In turn, I wasn't at the forum for awhile. I still have Max's kit for  a U47 that I never even opened, as well as an unused CT12 capsule.

Is it Max's full kit with the body?  Any chance you'd want to sell it?
Jimi Ray

Tim Campbell

Re: Official C12 Clone - Build and Support Thread
« Reply #2263 on: January 07, 2017, 03:46:42 PM »
You may have a loose connection or a stray piece of solder floating around inside the mic.

Re: Official C12 Clone - Build and Support Thread
« Reply #2264 on: January 07, 2017, 09:24:58 PM »
You may have a loose connection or a stray piece of solder floating around inside the mic.
That was it. Somehow a ground connection (on the 7-pin connector) became disconnected in the PSU. It must have been loose yesterday, causing the noise, and then fully disconnected overnight. Very weird. I re-soldered and everything is back to normal now. Thank you for the help!

Is it Max's full kit with the body?  Any chance you'd want to sell it?
Possibly. Yeah, it's the kit from a couple years ago with the Flea-made headbasket I believe. I literally never even opened the box Max shipped it in haha

Re: Official C12 Clone - Build and Support Thread
« Reply #2265 on: January 10, 2017, 05:40:08 AM »
Hello,

What do you think about replacing polystyren capacitors (C10, C11, C13) with Silver Mica capacitors?
Thanks

ln76d

Re: Official C12 Clone - Build and Support Thread
« Reply #2266 on: January 10, 2017, 01:54:39 PM »
Bad idea.

Re: Official C12 Clone - Build and Support Thread
« Reply #2267 on: January 10, 2017, 02:16:03 PM »
Thanks!
Why if I may ask?

ln76d

Re: Official C12 Clone - Build and Support Thread
« Reply #2268 on: January 11, 2017, 11:40:33 AM »
Because silver mica have tendency to microphonic more than polystyrene, because original unit used polystyrene (early versions ceramic caps) and MP at the output.  Polystyrene/styroflex aren't so hard to find, for 5nF can be anything between 4.7nF-6.8nF.
For the output definately MP (can be also PIO or MBM type) is the best choice.
Of course it's valid if you want get close to original unit as possible.

Re: Official C12 Clone - Build and Support Thread
« Reply #2269 on: January 11, 2017, 02:13:30 PM »
I'm using styroflex and Vcap OIMP but I just wanted to know if Mica would be best as I saw them a few times in certain builds.
Thanks  for your reply, I'll stay with the polystyrenes then.


Matador

Re: Official C12 Clone - Build and Support Thread
« Reply #2270 on: January 12, 2017, 11:40:28 AM »
I used silver mica in a few builds without problems - but I may have been lucky.  I never noticed any sound differences however compared to other cap formulations.  I think for filter caps it really doesn't matter one way or the other.

I would suggest to anyone who thinks their soldering may not be up to snuff take a look at micas, or NP0 ceramics (my current favorite), because they can tolerate soldering/re-soldering much better than styrene's.  They can also be cleaned with IPA without issue.