Yamaha DTXpress/DTXplorer/DTXtreme

--- In DTXpress@yahoogroups.com, "plancheeproductions" <DJ-Fille@p...>
wrote:
> Hi guys,
> 
> today i've built the piezo peizo/ rim switchcircuit from Keith (many 
> thanks for this, Keith!) and have to say that it is working very good!
> i just want it to have a little more gain, is there anybody who knows 
> what to do? I used the design on the edrum for free website
> http://edrum.for.free.fr/modules.php?name=Content&pa=showpage&pid=48
> the one with the two piezo's so there is no D1 and D2.
> On the edrumming website they say to use this type of 
> transistor:2N3904, i might try this out tommorow.

Someone has dropped R1 to quite a low value - around 1.5k - improve
gain. That is a little low, but certainly try lower values.

Almost any NPN transistor will work, but ones with a higher gain (hFE)
may give a little more sensitivity.

Keith.

(copy of reply also posted to DIYedrums)