[sdiy] LM13600 Gain Question

[Scott Gravenhorst]

I'm looking at the LM13600 data sheet and fig. 4 (stereo
volume control) has a formula to calculate the gain given
Iabc as:

Vout
---- = 940 X Iabc
Vin

Why 940?

Also, with a maximum Iabc of 2 ma. applied to one OTA, this
circuit can achieve a maximum gain of only 1.88.  So through
most of it's Iabc range, it's more of a voltage controlled
attenuator.  Am I whacked here?


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