globalpurpose
Active member
- Joined
- Jan 23, 2015
- Messages
- 38
What kind of threadlock do You use , sorry for my bad english , when i try to google it i have many different stuff shown
This stuff.What kind of threadlock do You use , sorry for my bad english , when i try to google it i have many different stuff shown
You mean 125 $ each including shipping ??? very nice !!!I emailed Jenny at Shengyin Electronics ([email protected]) and have 2 U47FET bodies on the way with a pair of M49 bodies & shochmounts that according the drawings she provided will work with Poctop's boards. It took a bit of back and fourth, but I'm on for 4 bodies at around $125 each with shipping. View attachment 126590
Yes, though the shipping was covering 4 bodies and a couple shock mounts, so I don't know what it would cost for say one body shipped.You mean 125 $ each including shipping ??? very nice !!!
I’m glad you got it sorted. I borrowed an idea from someone else near the the beginning of this thread and used some copper tape from the xlr ground lug to the body itself. So that is another way it could be done. My two are noiseless and sound awesome. So glad for this boards set and Dany’s fine capsules.Now sorted.
The recommended grounding through the xlr is not good. I used another wire from the pin 1 to ground the metal stand offs properly, thanks to TLRT's advice & now have a nice sounding mic.
Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Some build pics:
View attachment 104980
I've had terrible trouble with my 47 FET builds due to counterfeit or dodgy FET's.I built this thing and I have no output. I'm not even sure how to go about troubleshooting it with the hiZ PCB soldered to the main PCB by way of the switch PCB and JP1 and JP2.
My build notes on Page 3 of this thread specifically tell you how to assemble these and still be able to get them apart later if need be.I have that tester or one just like it from Aliexpress. The FETs and transistors for this build were bought from Mouser. I don't know if that is any guarantee against counterfeits but I admit I did not test them prior to installation.
I did replace C4 after finding it checked bad. It was a vintage "Kondur" cap salvaged from a piece of industrial equipment. It looked like a styro to me so I pulled it. Go figure, it's bad. I replaced it and the mic output audio for a couple brief seconds, then faded into silence again so I am back to square one. In the future I will not build any mics with these stupid round PCBs that have to be soldered together. It makes separating them for repair extremely difficult.
I always socket my transitors and fets. Makes it easy to pull them out and test if you need too.My bad for assuming Mouser is above reproach and not testing any of the transistors before installing them.
Of course I practice safe soldering and use a heat-sink condom on all semiconductors, styros, etc.
That's a great idea! I've given up on this mic for the time being. Attempting to trace the circuit and measure voltages with the boards piled on top of each other is just stupid frustrating. I will never build another round PCB mic. Way too much of a PIA for my level of patience.I always socket my transitors and fets. Makes it easy to pull them out and test if you need too.
I am really sorry to hear of your frustrations. I built two of these and they are some of my best mics. I would have to go back and read your posts again, but when I skimmed them before it seemed like maybe you’d used some old or questionable parts. I would encourage anyone building this mic to stick with the original BOM when selecting parts. Sometimes parts are no longer available or out of stock, but if you know how to match values and make sure they’ll fit (Mouser lists product dimensions), you can find brand new suitable alternative parts. I’ve yet to buy a bad or counterfeit transistor from Mouser or Digikey. My point is not meant to be condescending at all, please don’t take it that way. I would encourage you to remove any questionable parts and reinstall with new known good modern parts.That's a great idea! I've given up on this mic for the time being. Attempting to trace the circuit and measure voltages with the boards piled on top of each other is just stupid frustrating. I will never build another round PCB mic. Way too much of a PIA for my level of patience.
Check the big top copper spacers. they can reach and damage the pcb traces and ground the signal path.I was able to separate the boards by unsoldering the JP3, 4 connections from the amplifier board without too much drama or trauma. Lesson learned there.
Solder joints all look good under magnification. No shorts, cold joints or the like.
After powering up with P48, it produces audio for a couple seconds. Then it is as if the invisible hand of the engineer slowly pulls the fader down, and all becomes silent. Does anyone know what could be a likely suspect?
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