Yamaha DTXpress/DTXplorer/DTXtreme

--- In DTXpress@yahoogroups.com, "epvk_jahoe" <yahoo@e...> wrote:
>
> 
> 
> Wow, that's a quick service! Thanks a lot! 
> 
> I understand the circuit. One more thing: 
> Suppose I would want to add an extra pad signal to a stero pad
signal. Then, I guess one 
> should 
> - take J3 from the stereo pad (main = ingoing tip), with D2  to
outgoing tip
> -  take J1 from the stereo pad (rim = ingoing ring) and omit the
circuit 'behind' J1 except 
> perhaps D1, then directly to outgoing ring (if there is a signal on
J1, then J3 also already 
> has a signal since it's coming from the stereo pad) 
> - take J4 from extra mono pad, include the circuit (top part with
extra 10k) and add 
> signals to outgoing rim and tip as 'usual'. 
> 
> Does that make sense? Do I pass the DIY electronics test? ;)
> Thanks again!
> 

Erik,

Yes, that sounds about right.  You can miss out the odd diode on any
of the circuits, e.g. D2, but not D1 or D4.  This is because you need
 D1 and D4 to stop the main pad signal from triggering the rim, but it
is not strictly necessary to have D2 - it just balances the signals.

Also, people have found they need to tweak the values a little,
although that may only be on non-Yamaha pads/modules.  In particular,
dropping R1 and R4 to 10k makes it more sensitive to rim shots.  Also,
schottky diodes will reduce the loss through them rather than normal
diodes.

Keith.