5 % resisters for SOZ?

Selfmade · 19th February 2003, 04:59 PM

Is it possible to use 5% restisters (R1-R8) for the SOZ or is absolutly necessary to use the qualities (1%, 0,1 %) mentioned in the NP article?

regards

Günter

Henrik · 19th February 2003, 06:50 PM

To obtain a low diffrential dc off set you need resonable matced resistors. You can parallel the higher values with some resistor to match the lower value. The formula for this is R=1/((1/R1)+(1/R2)).

stefanobilliani · 19th February 2003, 07:00 PM

Quote:

Originally posted by Henrik
To obtain a low diffrential dc off set you need resonable matced resistors. You can parallel the higher values with some resistor to match the lower value. The formula for this is R=1/((1/R1)+(1/R2)).

Or ... R = ( R1* R2 ) / (R1+ R2)

Selfmade · 19th February 2003, 07:50 PM

thank´s for you answer.

Are 25 Watt enough for the resisters R1-R8 to build a 10 Watt SOZ? For this values I can find 1 % resistors.

regards

Günter

Henrik · 19th February 2003, 08:14 PM

10 watt output requires psu at +-25 Volt, which gives a total current draw at about 4.5 A. This means a little less than 50 W dissipation in all 8 Ohm resistors. I would go for 75W each just in case. You can parallel 3*25W to obtain one resistor at 75W.

19th February 2003, 04:59 PM	#1
Selfmade diyAudio Member Join Date: Feb 2002 Location: Flensburg	5 % resisters for SOZ? Is it possible to use 5% restisters (R1-R8) for the SOZ or is absolutly necessary to use the qualities (1%, 0,1 %) mentioned in the NP article? regards Günter

19th February 2003, 06:50 PM	#2
Henrik diyAudio Member Join Date: Feb 2002 Location: Copenhagen Denmark	To obtain a low diffrential dc off set you need resonable matced resistors. You can parallel the higher values with some resistor to match the lower value. The formula for this is R=1/((1/R1)+(1/R2)). __________________ Henrik

19th February 2003, 08:14 PM	#5
Henrik diyAudio Member Join Date: Feb 2002 Location: Copenhagen Denmark	10 watt output requires psu at +-25 Volt, which gives a total current draw at about 4.5 A. This means a little less than 50 W dissipation in all 8 Ohm resistors. I would go for 75W each just in case. You can parallel 3*25W to obtain one resistor at 75W. __________________ Henrik

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19th February 2003, 07:50 PM	#4
Selfmade diyAudio Member Join Date: Feb 2002 Location: Flensburg	thank´s for you answer. Are 25 Watt enough for the resisters R1-R8 to build a 10 Watt SOZ? For this values I can find 1 % resistors. regards Günter

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