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Mr Shafer 回應如下:
Hello Lee Ming,



thank you for the good news of coming order !



At first I need to know if balanced or unbalanced.





I calculated for balanced mode :



66+95+442 is definitely wring- gives 35 ohms.



95 + 442 is better gives 78 Ohms.



What means Dip 3 and Dip 5 to ON at both left and right Dip switch.









Just a sample for the calculation :



Balanced



For balanced you have to make same at adjustment at both dip switches.

It has to be 350 / 2 means 175 Ohms at positive and neg Input.



175 pos and 175 neg = 350 Ohms.



Will be 221 Ohms and 1 K Dip 5, 7 at both dip switches



R/1 = 47,000 ohms = 0.0000212 +

R/3 = 1,000 ohms = 0.001000 + ( Dip 7 )

R/4 = 221 ohms = 0.004524 ( Dip 5 )



Total equals = 0.005546163; 1/0.005546163 = 180 ohms x 2 = 360 Ohms







Or some thing more exact with 10 k in addition :



Will be 221 Ohms and 1 K and 10 k Dip 5,7,10 at both dip switches



R/1 = 47,000 ohms = 0.0000212 +

R/3 = 10,000 ohms = 0.0001000 + ( Dip 10 )

R/3 = 1,000 ohms = 0.001000 + ( Dip 7 )

R/4 = 221 ohms = 0.004524 ( Dip 5 )



Total equals = 0.005546163; 1/0.005546163 = 177 ohms x 2 = 354 ohms









Unbalanced



At unbalanced the negative input is short, so you need only 350 Ohms to adjust at left Dip switch



Will be 475 Ohms and 2,2 and 4,7 k Dip 6,8, 9 left row and right row only No. 12



R/1 = 47,000 ohms = 0.0000212 +

R/2 = 4,700 ohms = 0.000212 + ( Dip 9 )

R/3 = 2,200 ohms = 0.0004545 + ( Dip 8 )

R/4 = 475 ohms = 0.00212 ( Dip 6 )



Total equals = 0.0028162247; 1/0.0028162247 = 355 ohms









Best regards

Friedrich Schaefer