Yamaha DTXpress/DTXplorer/DTXtreme

--- In DTXpress@yahoogroups.com, "moosetication" 
<moosetication@y...> wrote:
> OGD, anything obvious from the circuitry when you disassembled 
yours?
> 
Stewart/Chris,

The tip/sleeve are run separately through two resistors R1 & R2 to 
the connector CN1 that has the two leads that goes to the piezo on 
the metal plate on the pad.

The ring/sleeve are run separately from the piezo circuitry. The 
ring circuit is split into to pathways, one circuit is run directly 
to the rim 1 FSR and the second circuit is run through a resistor to 
the rim 2 FSR.

Thus a large current passed through the ring/sleeve circuit is 
interpeted as rim 1 triggering and a small current passed through 
the ring/sleeve is interpeted as rim 2 triggering. 

There is no connection between the circuitry of the piezo and the 
rim switches.

The TP-65 has the same PCB as the TP-65S, except the single 
resistor  R3 and Connnector CN2 are not present.

OGD