Erica Synths EDU DIY Dual VCA Eurorack Module Kit - Manual (Page 20)

Okay – and the second option? Well, this is where it actually gets interesting for us.
Because the second option is adjusting the constant base voltage that our signal is riding
on top of. Up until now, we’ve been using a 20 mV peak-to-peak triangle oscillation with a
DC bias of 570 mV. So on our adjusted curve, we were moving back and forth across this
tiny marked section.
Now what we could do is move that section down the curve – to
where it is significantly less steep .
Since this will have a direct e ff ect on our collector current swing, we should also see a
reduction in gain. But while we could go through the trouble of adding our scaled-down
input signal to a variable DC bias before applying the sum to the transistor’s base, there is
a simpler, more elegant solution.
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