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Old 5th September 2019, 08:01 PM   #1741
chris0202 is offline chris0202
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Jan,

Thank you for the update! This clears a lot of confusion. I will look into the schematic again.

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Originally Posted by jan.didden View Post
There's two resistor on top of each other, one end to Vout, the other end to gnd, the mid to -input opamp. Those are the ones that set the output voltage by 'multiplying up' the ref voltage at the +input of the opamp.

On the schematic in the diyaudio store, R7 (pos) and R14 (neg) are the 'bottom' ones that are connected to gnd, just as the reference. The 'top' is R7 (pos) and R13 (neg), these are connected to Vout.

Agreed?

Edit: 'bottom' I mean at gnd, not physically, sorry. I think in voltages ;-)

There is indeed a cap // R7, R13 to make the voltage division for AC equal to one, for better regulation.

Jan
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Old 9th September 2019, 07:17 AM   #1742
chris0202 is offline chris0202
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Hi Jan,

Would you check writing in this link to see if there is any issue on calculating values of R13 and R14? This is hyperlink on diyaudio store product page of superreg.

https://cdn.shopify.com/s/files/1/10...62409842112246

I have read through materials again. Based on your replies to others and me, bottom resistor must have the same voltage with Vref to power opamp (as bottom resistor has one end to gnd, and one end to neg input of opamp). But the document said the opposite. It seems this document had R13 and R14 flipped.

Thanks!

Quote:
Originally Posted by jan.didden View Post
There's two resistor on top of each other, one end to Vout, the other end to gnd, the mid to -input opamp. Those are the ones that set the output voltage by 'multiplying up' the ref voltage at the +input of the opamp.

On the schematic in the diyaudio store, R7 (pos) and R14 (neg) are the 'bottom' ones that are connected to gnd, just as the reference. The 'top' is R7 (pos) and R13 (neg), these are connected to Vout.

Agreed?

Edit: 'bottom' I mean at gnd, not physically, sorry. I think in voltages ;-)

There is indeed a cap // R7, R13 to make the voltage division for AC equal to one, for better regulation.

Jan

Last edited by chris0202; 9th September 2019 at 07:19 AM.
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Old 9th September 2019, 09:56 AM   #1743
jan.didden is offline jan.didden  Europe
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Very good catch, you are absolutely right. It's R7 and R14 that have the same voltage as the reference (6.9V with the LM329). The other two resistors (R6, R13) thus have Vout-Vref across them.

I'll get the write-up updated. Sorry for any confusion ...

Jan
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Old 9th September 2019, 11:08 AM   #1744
jan.didden is offline jan.didden  Europe
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Done. Courtesy Jason.

https://cdn.shopify.com/s/files/1/10...omizing_r2.pdf

Jan
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Old 9th September 2019, 08:09 PM   #1745
chris0202 is offline chris0202
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Jan,

Thanks! I feel this is why you got asked about this calculation a lot previously.

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