PLAN B analog blog

Thank you for your comments.

> There are two things you need to check:
>
> 1) is the amplitude of the two signals you are inputting iinto
> INJECT A and B equal in amplitude to begin with?

Checked. The equal balance is, when xfade knob is at slightly over 9 
o'clock. Signal at inject_B disappears completely at 2 o'clock (but 
comes back, if I insert a plug halfway in into vc_xfade).

> 2) You need to adjust the trim pot on the second board - this
> effects the linearity of the cross fade . There is only one trimmer
> on that assembly - it's easy to find.

Sorry. Would this change the knob response? Or does it affect sound - 
I don't want to lose the "equal power transfer"?

Best regards
Jari Jokinen
 

--- In PLAN_B_analog_blog@yahoogroups.com, "jalmari3" 
<jari.jokinen@...> wrote:
>
> From Peter Grenader:
> 
> There are two things you need to check:
> 
> 1) is the amplitude of the two signals you are inputting iinto 
INJECT A and B equal in amplitude to begin with?
> 
> 2) You need to adjust the trim pot on the second board - this 
effects the linearity of the cross fade . There is only one trimmer 
on that assembly - it's easy to find.
> 
> As far as the cross fade VC, like a VCA it does not accept bipolar 
control signals - only positive voltages and because of this  it can 
only move from one direction so yes, you need to offest the manual 
pot to acheive the xfade amount you need.
> 
> Jari's original post:
> 
> Yesterday I did some cross fading with M14. I used inject_a and
> inject_b inputs and got smooth cross fading both with xfade knob and
> vc_xfade input.
> 
> However, it is strange, that the xfade knob has to be set slightly 
over
> 9 o'clock to get equal balance between inject_a and inject_b. This 
is,
> when no voltage is applied to the vc_xfade input. One would assume 
to
> get equal balance at 12 o'clock.
> 
> Furthermore, when I apply bipolar LFO sine into the vc_xfade, I 
have to
> readjust: To get "symmetrical" cross fade between inject_a only and
> inject_b only, the xfade knob has to be (carefully) set slightly 
under
> 9 o'clock.
> 
> This is inconvenient in my opinion. It reminds the bandwidth/cross-
fade
> knob of my M12, about which I complained earlier: Too much 
sensitivity
> near full counter clockwise position.
> 
> Best regards
> Jari Jokinen
>