RF & RG values to adjust Placid HD BP Vout

MWL168 · 5th September 2011, 04:12 PM

Hi Russ and Brian:

Is there a mistake in the Placid HD menu regarding the formular to adjust the Vout?

Using Vref = 3.85V and RF = 1k; Vout = Vref * (1 + RF/RG); Vout would be about 9V when RG is 750R, not 14.5V as listed in the table. I should use about 345R for RG to get 15V Vout.

Did I miss something?

Thanks!

Russ White · 03:05 AM

I think that was written assuming RF of 2K as in the schematic.

Yes 345-351 would be about right for 1K, but I am pretty sure 2K is provided.

If the manual states RF 1K that is probably a typo. We will fix that one way or the other. Thanks for bringing it to our attention.

MWL168 · 9th September 2011, 02:37 PM

Thanks Russ!

You are correct! The schema shows 2K for RF and I confirmed my kit comes with 2K for RF (R12A and R12B). The RF 1K is a typo in the manual.

5th September 2011, 04:12 PM	#1
MWL168 diyAudio Member Join Date: Oct 2005	RF & RG values to adjust Placid HD BP Vout Hi Russ and Brian: Is there a mistake in the Placid HD menu regarding the formular to adjust the Vout? Using Vref = 3.85V and RF = 1k; Vout = Vref * (1 + RF/RG); Vout would be about 9V when RG is 750R, not 14.5V as listed in the table. I should use about 345R for RG to get 15V Vout. Did I miss something? Thanks!

8th September 2011, 03:01 AM	#2
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	I think that was written assuming RF of 2K as in the schematic. Yes 345-351 would be about right for 1K, but I am pretty sure 2K is provided. If the manual states RF 1K that is probably a typo. We will fix that one way or the other. Thanks for bringing it to our attention. __________________ Less pulp more juice Twisted Pear Audio. Last edited by Russ White; 8th September 2011 at 03:05 AM.

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9th September 2011, 02:37 PM	#3
MWL168 diyAudio Member Join Date: Oct 2005	Thanks Russ! You are correct! The schema shows 2K for RF and I confirmed my kit comes with 2K for RF (R12A and R12B). The RF 1K is a typo in the manual.

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