General > General Technical Chat

What happend to 320K resistors ?

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Jan Audio:
Ofcourse i want the precision for a DAC,
because i could buy them some time ago i dont want those 316K.
They just disapear ?, someone has buyed them since they have nothing left.
Why not make a few to keep stock ?, is it so difficult ?

bdunham7:
Exactly what were you buying before that you can't get now?  Are the ones I posted not what you need???  Other than '320K' what are the rest of the specs you need or had?

JohnnyMalaria:

--- Quote from: Jan Audio on February 19, 2021, 04:09:40 pm ---Ofcourse i want the precision for a DAC,
because i could buy them some time ago i dont want those 316K.
They just disapear ?, someone has buyed them since they have nothing left.
Why not make a few to keep stock ?, is it so difficult ?

--- End quote ---

Mouser has them. Granted, it's overseas but you have a very specific requirement so your options are going to be limited.

Alternatively, buy a lot of 10% or 20% 330K and measure each one. One will be 320K.

nali:

--- Quote from: Jan Audio on February 19, 2021, 04:09:40 pm ---Ofcourse i want the precision for a DAC,
because i could buy them some time ago i dont want those 316K.
They just disapear ?, someone has buyed them since they have nothing left.
Why not make a few to keep stock ?, is it so difficult ?

--- End quote ---

Just wondering, why do you need such precision when you only have 6 bits anyway?

Siwastaja:
What's wrong with the classic R2R DAC that uses a single value of resistor?

What's wrong in putting another resistor in series?

How are you driving your resistor DAC? From standard CMOS outputs of an MCU or logic IC?  :popcorn:

I think the problem isn't sourcing 320kOhm resistors; it's designing a DAC. Let's start by defining your requirements for the DAC.

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