Trigger input voltage tolerance on external drum modules

Cwejman, Livewire, TipTop Audio, Doepfer etc... Get your euro on!

Moderators: Kent, luketeaford, Joe., lisa

Post Reply
User avatar
akavalve
Common Wiggler
Posts: 199
Joined: Tue May 10, 2016 10:47 am
Location: Boston

Trigger input voltage tolerance on external drum modules

Post by akavalve » Wed Jan 13, 2021 3:34 pm

I've got a Pearl Drum X sitting around that I thought I'd try triggering from euro.
Anyone have a rule of thumb for safe input voltages on drum brain input circuits?
Wondering if I need to pad or current limit.

User avatar
akavalve
Common Wiggler
Posts: 199
Joined: Tue May 10, 2016 10:47 am
Location: Boston

Re: Trigger input voltage tolerance on external drum modules

Post by akavalve » Wed Jan 13, 2021 7:07 pm

Found a schematic online for the Drum X specifically.
Looks like +/-8 volt rails and the trigger feeds the opamp input directly, so probably a bad idea to do this without attenuation or protection.
Not sure about other drum brains with trig ins in general.

modeleus
Learning to Wiggle
Posts: 43
Joined: Sat Dec 19, 2020 5:50 pm

Re: Trigger input voltage tolerance on external drum modules

Post by modeleus » Thu Jan 14, 2021 7:44 am

Usually all Digital Trigger should have a response in the 5V range. The op-amp input may have a tolerance of +-0.5V above Vcc and below -Vcc but if your machine is 8V a modular trigger of 10V may damage it.

Many Trigger input circuit designs have some kind of protection diodes for this purpose but usually you can´t take the chance. If you have an attenuator for this purpose use it.

Post Reply

Return to “Eurorack Modules”