I used Dan's D7 capsule and a Cinemag CM-13101 transformer in both. The capsule is really nice, darker than the Heiserman K47 in my H47FET and full bodied. I like it more than that mic.
Would love to know your thoughts on the comparisons.Pretty soon I ll complete this build. Still waiting on a Moby 47fet transformer…last piece of the puzzle. I have an original Neumann k47 for it so it will be an interesting comparison with the original 47fet we have here.
It fits…just clip the 4 ends of the soft “toothlike” plastic ( corners). Also file a little the pcb to make space for the screws that hold the laminationsGot a really nice Moby transformer yesterday. It doesn't quite fit this PCB set; perhaps I'll make my own lower deck to fit it. If I do, I'll share the Gerbers.
I ordered 10 x 5% on the gamble that I can measure one of them within 1% tolerance. The schematic I have looked at does not give resistor tolerance. Is the original design 1% tolerance?Can anyone help me find alternatives for:
Metal Oxide Resistors 220M OHM 1% 200PPM 1W
and
Metal Oxide Resistors 1/4watt 200M 1%
Thanks in advance!
I'm interested in Beesneez and AMI group buys.Anyone interesting in doing a bulk order from either AMI for output transformers or Beesneez for capsules?
I talked to AMI and they would give us 7% off an order of 10. I need two so we are already on our way.
Beesneez said they would give us 20% off and order of any 10 capsules. I'd be in for four.
let's save some cash yall!
No, I don't think you have wired the transformer correctly.I’ve just finished putting this together, but I seem to be having some problems and I’m not entirely sure where to start working through them. Currently I have no signal, but can hear an audible hum when touching the mic. Is it likely these are two separate issues?
I was also hoping to check my transformer wiring - I went with Moby’s 09331. I tucked away the lower impedance secondary winding since this build only has the one 10dB pad on the front end. I used one ground wire to attach to the pin 1 output on the amp PCB and the other is connected directly to the XLR output; is this correct?
Thanks for any advice, and happy to fill in additional details that may be helpful!
Have you wired the XLR pins to the amp board correctly? Pin 1 (ground) should also connect to the body ground lug.Thanks so much, @doqmemory ! Transformer wiring is now corrected. It looks like I‘m still running into the same issue, though it may be louder now? I’m not sure; I didn’t note what my gain was set to in earlier tests.
Currently when I power it up I have a low level hum that gets quite a bit louder when I touch the mic. It doesn’t seem to be passing any signal to the output. Any suggestions on where to start tracing this problem out?
Try cleaning hi-z areas of less quiet one?I just finished this build with a BeesNeez M7 capsule. I have a square PCB build with a BeesNeez K47.
I know the capsules will sound different but the new, round PCB build is about 5dB quieter. Is this to be expected from the capsule or possibly a difference in the circuit?
Oh I guess I mean the output volume—they are not noisyTry cleaning hi-z areas of less quiet one?
If everything else is identical, I'm guessing you have varying FETs that amplify differently due to the corresponding biasing. A changed PCB layout does not result in a 5db level difference with the same circuit.You can easily test the capsules by swapping it, if the 5dB level difference goes with it, you know what's going on.Oh I guess I mean the output volume—they are not noisy
Hi Dan,D47 Fet New Body Style PCB now available
https://groupdiy.com/threads/vintag...t-for-diy-new-d7-custom-capsule.49675/page-50Best,
Dan
Hi All, Since the recrudescence and availability of this new u47 fet body and since i have been involved with it when it originally came out
I have decided to offer it for dyers getting those new body , it has meticulously been sized to be a perfect fit including the slider switch position and tolerance on the side of the body it is mounted via Dual Header Connector ( HZ deck-Amp deck) , you can fit a lot of transformer on the Tranny deck and the HZ layout is very similar to my D47Fet.
PCB are in stock now 40usd set , + mailing , i will add it to the webstore Soon
if interested please post here so i can have a idea if i need to reorder more of those.
Best,
Dan,
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