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Old 19th February 2003, 05:59 PM   #1
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Default 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
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Old 19th February 2003, 07:50 PM   #2
Henrik is offline Henrik  Denmark
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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)).
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Old 19th February 2003, 08:00 PM   #3
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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)
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Old 19th February 2003, 08:50 PM   #4
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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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Old 19th February 2003, 09:14 PM   #5
Henrik is offline Henrik  Denmark
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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.
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