5 % resisters for SOZ?
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 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
stefanobilliani
diyAudio Member

Join Date: Jun 2002
Location: Italy
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)

 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
 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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