Neumann KM84 DIY Body & PCB kit – CLOSED
« on: February 25, 2018, 09:51:01 PM »


DIY KM84 kits - Sold Out

Parts included in kit:
– KM84 DIY PCB designed by Graeme Woller
– Maiku cardioid SDC capsule
– Raw brass body-tube
– Polished and plated capsule head and connector housing
– Fairchild 2N3819 JFET

Parts needed to complete build:
– Components outlined in Mouser BOM
– BV-107 type transformer (Cinemag CM-5722, AMI T8, or 3U GZT-84)

That's it  ;)

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Pricing incl. all charges and shipping:

EU / CH – €130,00
Rest of world – €136,00

If ordering more than one kit, only add €110 for every extra unit.

3U GZT-84 transformers are also available for €25
Just add however many you need to your total.


How to order:
Send your Paypal payment in EUR directly to [email protected] with your name and shipping address.

Sale is on FCFS basis, no holds.

Payments only accepted in EUR.
Don't send CHF, your payment will be incomplete.


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« Last Edit: June 08, 2019, 02:09:47 PM by Banzai »


Neumann KM84 DIY Body & PCB kit – Only 50 kits available @ €100!!
« Reply #1 on: February 25, 2018, 10:16:52 PM »
« Last Edit: February 03, 2019, 11:00:33 PM by Banzai »

Wiring for 3U transformer
« Reply #2 on: February 28, 2018, 01:50:39 PM »
3U GZT84 wiring:

RED wire -> G
BROWN wire -> R
YELLOW wire -> B
ORANGE wire -> Y

Transformer board pads:




Stock 3U diagram:
« Last Edit: February 23, 2019, 12:56:48 AM by Banzai »

TillM

Re: Neumann KM84 DIY Body & PCB kit – Only 50 kits available @ €100!!!
« Reply #3 on: February 28, 2018, 02:22:35 PM »
Hi Mike,
Payment send for one.
I’m interessted in a groupbuy for the cinemag too

Re: Neumann KM84 DIY Body & PCB kit – Only 50 kits available @ €100!!!
« Reply #4 on: February 28, 2018, 02:54:55 PM »
Hi Mike,
Payment send for one.
I’m interessted in a groupbuy for the cinemag too

Thanks!  :D

Ericbazaar

Re: Neumann KM84 DIY Body & PCB kit – Only 50 kits available @ €100!!!
« Reply #5 on: February 28, 2018, 04:18:30 PM »
Hello Banzai,

Can you tell me more about the micbody? Internal diameter and length?
More Infos about the capsule would be nice.
Is it possible to fit a submini tube inside?

Best

TillM

Hello Banzai,

Can you tell me more about the micbody? Internal diameter and length?
More Infos about the capsule would be nice.
Is it possible to fit a submini tube inside?

Best
I know Banzai could give you better informations but as far as I know, if they have the same diameter like the beesneez lulu a submini tube should work. Ben use the same body for his tube mic small condenser mics.

Vac11

Is there compatibility between this body and the geniue Neumann KM84 capsule?

Hello Banzai,

Can you tell me more about the micbody? Internal diameter and length?
More Infos about the capsule would be nice.
Is it possible to fit a submini tube inside?

Best

Original Neumann is 21 x 110mm
This body is 22 x 130mm. It's short and fat, very nice looking mic.

Capsule is based on KK84. Same materials (mylar/gold)

No problem for sub-mini. Plenty of space inside (ø19mm)

Is there compatibility between this body and the geniue Neumann KM84 capsule?

The connecting pin is different and the Neumann is slightly smaller in diameter. But unless you have one lying around, it's not really worth it: new KK84's are €535. Might as well buy a complete vintage KM84  ;)


midwayfair

Aw man, This is a great deal and we really don't have many options for these, and I even have the transformer Ina drawer upstairs, but I don't think I can swing this while in classes.

Is this likely to be a one-time thing, or do you plan on doing runs every once in a while?
I'm Jon. Myself's music and things I make: jonpattonmusic.com. My band: www.midwayfair.org. [Disclaimer: PCBs of guitar pedals I've designed are sold by Madbean, 1776 Effects, and JMK PCBs.]

TillM

PAyment sent for a second one.  ;)
I will try it, really like the sound of the KM84, will see how it sounds compared to each other.

PAyment sent for a second one.  ;)
I will try it, really like the sound of the KM84, will see how it sounds compared to each other.

Thanks x2  :D


Aw man, This is a great deal and we really don't have many options for these, and I even have the transformer Ina drawer upstairs, but I don't think I can swing this while in classes.

Is this likely to be a one-time thing, or do you plan on doing runs every once in a while?

For the moment it's just a one time thing. With Graeme we wanted to create a high quality project that's really easy to build and accessible to anyone with a soldering iron. This might be the simplest project on Groupdiy: fill the board, set bias, screw on the capsule and you're done!

The metalwork is also a custom run made for this project, the only off the shelf parts being the springy bit and the connector housing. We left the body tube raw on purpose, so everyone can decide whether they want to leave as is, polish, beadblast, powdercoat, spray paint, or plate. Leaving as is, it should get a nice patina finish after a while (you can accelerate the process by beadblasting).

Potato Cakes

I would like four of these. PM sent.

Thanks!

Paul

Potato Cakes

Payment sent for four (4) kits.

Thanks!

Paul

Ericbazaar

Money sent for two Kits. Will build nice little Tube Sticks  ::)

Thanks Mike for doing this!

midwayfair


For the moment it's just a one time thing.

Sigh ... time to see if I can move some guitar pedals on Craigslist then before these sell out. Or might just ask the wife for an indulgence :)
I'm Jon. Myself's music and things I make: jonpattonmusic.com. My band: www.midwayfair.org. [Disclaimer: PCBs of guitar pedals I've designed are sold by Madbean, 1776 Effects, and JMK PCBs.]

r2d2

Hi
Any info about capsule and rest of parts cost to complete the mic ?

Any sound sample like acoustic guitar and voice  recorded with a transparent preamp (as well) ?
And better more  some sound comparison with an original unit .

..... Cracking D.Vader Firewall ...  II-)

TillM

Hi
Any info about capsule and rest of parts cost to complete the mic ?

Any sound sample like acoustic guitar and voice  recorded with a transparent preamp (as well) ?
And better more  some sound comparison with an original unit .
this is a first time offer, so there will be no sound comparison at this time.
Anyway, Banzai uploaded a schematic and a BOM.
And as Banzai already said, the capsule is based on the KK84.

Payment sent for four (4) kits.

Thanks!

Paul
Money sent for two Kits. Will build nice little Tube Sticks  ::)

Thanks Mike for doing this!

Thanks!  :D

Hi
Any info about capsule and rest of parts cost to complete the mic ?

Everything is included except for parts listed in Mouser BOM and transformer