Thank all of you who have decided to try this project out for yourselves. It means a lot for me to be able to give back to this community from which i've learned so much and have grown so much joy.
I've just went through the mouser carts today and replaced all backordered components so y'all don't have to.
UVMPSU:
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=9aae864417
KMV Mic (x1):
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=1633129541
I had to swap out the LM317 regulator in the HV section for one that was in stock. The one I prefer is this one (
https://www.mouser.com/ProductDetail/511-LM317P ) but will be back ordered until the end of april. I prefer this one as it has plastic insulation over what would be the big plated conductor with the hole. This part of the regulator in this circuit will have very high voltage on it so do be careful when you're poking around in there. It is functionally identical but just package is slightly different. Once it is back in stock I will modify the cart.
vs
If you have planned to build two mics please order the KMV mic kit x2 (or however many you've purchased.) as that cart is just for a single mic.
RE: Cathode Bias Resistor scheme on KMV. I have added 1k for those who want to use a fixed resistor with a trim pot.
1.8k and 2.2k for those who want to use only a fixed resistor. And if you only want to use the trim pot just leave out the fixed resistor position and set the jumper accordingly. I prefer using the 1k + trimmer so the bias point never is shorted to ground. ( Some people do a fixed resistor with parallel trim but for whatever reason I did series with a jumper scheme.
) Don't be alarmed if you have spare resistors when you finish building your mic board.
If you are not planning to use UM70 or multi patterns you can remove two of the three more costly 150M resistors as well as the C6 capacitor. If you have an mv691, the top threaded part the capsule fits on does not have three conductors, the ring is missing so in this case you can omit those parts too.
The NFB jumper is already bridged on the copper layer so if you are using the NFB network you don't have to touch the jumper. This jumper will need to be cut with a blade you want to remove the network from the circuit. To return it just bridge pads with solder. Its nice so you can do a/b easily (not as easy as a switch though). You could even try 220p or 80p if you want to goof around with the feedback cap. I just stuck with the original value.
You will see little notes on the silk that will help you remember the jumper configurations with out having to dig into the schematic.
You can use the transformer that comes with the alctron supplies which iirc are like 175v and 10v secondaries. The chinese transformers, while seem to perform ok electrically do seem to be prone to mechanical resonance hum. Because of this I've been using Edcor's dual primary with secondaries of 200V@10mA & 12V@1A. (
https://edcorusa.com/products/xpwr080-200v-10ma-12v-1a)
The footprint of the PCB is designed to be a drop in for the chinese generic psu that chunger used to carry. For the North American folks, I think mic parts stocks the PSU (overpriced imo) but this one will have the cheap fuse holder that you can transfer from the stock pcb to the UVMPSU. My favorite one to use is from Dennis at AMI tabfunkenwerk. I prefer the AMI one as its a heaver duty steel as well as having an integrated fuse holder in the IEC. Either of these will give you the chassis, the transformer and fuse holder. But you obviously can put this in any chassis.
I've attached an updated iBOM guide for component placement. I didn't dial in all the mouser part numbers with the project so just go off of value and designator. Still learning the administrative and project manager aspects of Kicad. But this will do the job done for those who need a bit more clear guidance.
Eventually, I think ill make a dedicated build guide thread for questions and to have all the updated project materials in one spot with out having to dig through pages of a thread. But for now this is fine.
Thanks again friends.
But also practical...
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