resilient

Re: Official C12 Clone - Build and Support Thread
« Reply #2600 on: February 19, 2021, 10:10:59 AM »
He is, he's quite busy. Send him an email and get on his waiting list. I got a pair slightly faster than expected. His email address is on his website. Google Campbell Transmitter.

Any idea what his lead times are right now?  I've emailed him earlier this week, but haven't heard back yet.  I would expect 2 or 3 months, maybe longer. 

Brandon


Tim Campbell

Re: Official C12 Clone - Build and Support Thread
« Reply #2601 on: February 19, 2021, 04:05:54 PM »
Brandon, sorry I am so slow at responding. All my OEM manufacturers are bringing out new mics and so I've been swamped. Unfortunately I am still a 1 man operation and so I am also head cook and bottlewasher.
I try to get to everything :)

resilient

Re: Official C12 Clone - Build and Support Thread
« Reply #2602 on: February 19, 2021, 04:29:20 PM »
Brandon, sorry I am so slow at responding. All my OEM manufacturers are bringing out new mics and so I've been swamped. Unfortunately I am still a 1 man operation and so I am also head cook and bottlewasher.
I try to get to everything :)

Haha!  No worries, Tim.  I hope I didn't come across as upset.  I hadn't taken it personally.  :) I will now look forward to your reply!

Brandon

Re: Official C12 Clone - Build and Support Thread
« Reply #2603 on: February 19, 2021, 09:30:51 PM »
Brandon, sorry I am so slow at responding. All my OEM manufacturers are bringing out new mics and so I've been swamped. Unfortunately I am still a 1 man operation and so I am also head cook and bottlewasher.
I try to get to everything :)

just sent you an email about purchasing 2 maybe 3 capsules from you.

Can someone chim in on Tims buying process?

Tim Campbell

Re: Official C12 Clone - Build and Support Thread
« Reply #2604 on: February 20, 2021, 10:18:49 AM »
Earl I have emailed you all this info.

Re: Official C12 Clone - Build and Support Thread
« Reply #2605 on: February 21, 2021, 04:52:51 AM »
Thank you Tim

marked

Re: Official C12 Clone - Build and Support Thread
« Reply #2606 on: February 25, 2021, 03:28:26 PM »
Hi everybody,

Just a thought. Has anyone tried different regulators for the heater? There are some discussions on some threads on the change of reg between LM317 vs LT1086 or other varieties, (for heater supply). On paper it should not make much of difference perhaps, but some people swear on real life listening tests, and I would like to ask the community on this? Also would it be possible to swap between these in the current PSU schematic?
Best regards
Mark

Re: Official C12 Clone - Build and Support Thread
« Reply #2607 on: March 22, 2021, 09:20:50 PM »
Measure your voltages on your Polar pattern pin. Should be pin 4 inside the PSU and pin 3 inside the mic. Measure in both places. Measure in Omni, cardioid and fig 8. and post the voltages here.

Matador

Re: Official C12 Clone - Build and Support Thread
« Reply #2608 on: March 23, 2021, 01:48:02 PM »
Hi everybody,

Just a thought. Has anyone tried different regulators for the heater? There are some discussions on some threads on the change of reg between LM317 vs LT1086 or other varieties, (for heater supply). On paper it should not make much of difference perhaps, but some people swear on real life listening tests, and I would like to ask the community on this? Also would it be possible to swap between these in the current PSU schematic?
Best regards
Mark
They are equivalent in operation, although I'm not sure the pinout is exactly the same.

LM317 has slightly worse dropout, however has better specified ripple rejection with a bypassed adjustment pin (80dB versus 75dB).  Provided the two devices are trimmed so that the voltages are the same, I can't see why there would be any difference.

Most arguments between these regs have to do with powering audio circuit rails, and how the output impedance of the regulator may affect things if it changes within the audio band.  But a heater is essentially a 10-20 ohm, 3W resistor, not a high-gain preamp. ;)

Re: Official C12 Clone - Build and Support Thread
« Reply #2609 on: March 25, 2021, 10:41:08 AM »
Measure your voltages on your Polar pattern pin. Should be pin 4 inside the PSU and pin 3 inside the mic. Measure in both places. Measure in Omni, cardioid and fig 8. and post the voltages here.
I measured at the power supply so far. I am getting omni 5.2 MV cardioid 13.1MV and figure 8 197.1v


Matador

Re: Official C12 Clone - Build and Support Thread
« Reply #2610 on: March 25, 2021, 11:55:37 AM »
I measured at the power supply so far. I am getting omni 5.2 MV cardioid 13.1MV and figure 8 197.1v
So that's 5.2 "milli-volts" (hopefully not Mega-volts)  ;) ?  Measured with nothing plugged in to the PSU, right at the 7-pin connector?

With nothing plugged in, can you measure all 7 pins and let us know?

ubxf

Re: Official C12 Clone - Build and Support Thread
« Reply #2611 on: March 25, 2021, 12:53:49 PM »
He is building a Tesla coil


 

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