Group Buy for mosfets for FC CEN IV through hole US and Canada ONLY

[hirscwi]

alazira - 2
PJN - 2
WCWC - 1
Paddy Garcia - 1
thirdicomplex - 1
manniraj - 1
BEYoung -3
Malvin - 1
Kokanee -3
tadek -4
hirscwi - 1 set

 

[nopants]

alazira - 2
PJN - 2
WCWC - 1
Paddy Garcia - 1
thirdicomplex - 1
manniraj - 1
BEYoung -3
Malvin - 1
Kokanee -3
tadek -4
hirscwi - 1 set
n0pants - 4

 

[EUVL]

Why would you need more MOSFET sets than PCB sets ?
They are only matched according to criteria specific for this particular application.


Patrick

 

[RickRay]

25 sets total with my set added at this time. I should get a quote for the MOSFET's next week.

 

[nopants]

oops, I don't know why I thought I needed 4 mosfet sets for 2 pcb sets. Can't seem to edit my posts, but if I have to eat the cost nbd

 

[RickRay]

Current list, a couple have dropped out or being move to the end of the line:

alazira - 2
PJN - 2
WCWC - 1
Paddy Garcia - 1
thirdicomplex - 1
manniraj - 1
Malvin - 1
Kokanee -3
tadek -4
hirscwi - 1 set

BEYoung -3 ( if I have enough sets left over)

 

[DiyFan]

I would like to reserve a set please.

alazira - 2
PJN - 2
WCWC - 1
Paddy Garcia - 1
thirdicomplex - 1
manniraj - 1
Malvin - 1
Kokanee -3
tadek -4
hirscwi - 1 set

BEYoung -3 ( if I have enough sets left over)
Diyfan -1

 

[RickRay]

Update - MOSFETs have been ordered, waiting on delivery.

 

[RickRay]

Update- I have the MOSFETS on-hand and have matched them. I ended up with 41 sets. I am waiting to talk to Fran to make sure everything is up to the standard he used for matching.

 

[EUVL]

You need to tell me what average Vgs values you have, so that I can calculate resistor values to suit.
They might be different from those of Fran.


Patrick

 

[RickRay]

Patrick - Double check my calculations, but I would like to send the exact resistor needed for each set. You subtract to get the difference between p-channel and n-channel, then divide by .007, 7 mA. That will give you the resistance to place in series with the set measuring the highest Vgs, correct? Since I haven't seen the directions yet I'm picking up from what was told to me to match the sets.

 

[RickRay]

Or should I divide by .014 because there is one resistor providing bias to the two MOSFET's?

 

[RickRay]

I haven't seen the circuit yet, so I'm guessing.

 

[EUVL]

If you have measured all NMOS and PMOS, you can work out the average Vgs.
Then just send me those two numbers, I'll do the rest.

This applies to all those who buy from you.
The trimming is then to take care of Vgs variations within you batch.


Patrick

 

[RickRay]

Got it.

 

[RickRay]

N-Channel avg Vgs = 2.171V
P-Channel avg Vgs = 1.800V

 

[Vunce]

Nice work RR!
Good to know the small batch I measured is similar:
NMOS avg Vgs = 2.24V
PMOS avg Vgs = 1.70V

 

[RickRay]

Thanks, nice to know maybe I did it correctly, LOL.

 

[alazira]

Patrick - Double check my calculations, but I would like to send the exact resistor needed for each set. You subtract to get the difference between p-channel and n-channel, then divide by .007, 7 mA. That will give you the resistance to place in series with the set measuring the highest Vgs, correct? Since I haven't seen the directions yet I'm picking up from what was told to me to match the sets.

Applying your numbers to Fran's example I get 53R added to R3t (20R subject to change) = 73R

 

[RickRay]

Applying your numbers to Fran's example I get 53R added to R3t (20R subject to change) = 73R

Do not use my calculations, they are not correct. Wait for Patrick to provide the correct values for each resistor.