![](https://s3images.coroflot.com/user_files/individual_files/613050_a9rylao8nyfesqxdpfwqv_f6n.jpg)
The guts and brain of the operation.
![](https://s3images.coroflot.com/user_files/individual_files/613050__fj5wiwfqi37e9cxocfylgixq.jpg)
Testing the Midi input, audio output and trigger inputs. Getting familiar. Careful with those 3.3v triggers. The modular gate voltage is 10v, so the trigger input must be padded down.
![](https://s3images.coroflot.com/user_files/individual_files/original_613050_AEbdoCBHD7avQlBTyFqh5y9ay.jpg)
10v gate triggers need to be scaled down to <3.3v so as not to damage the Tsunami board. I'll be using a transistor as a basic gate controlled switch with the pull-ups enabled on the Tsunami. This means that IF gate = 10v @ base of 2n222 xtror, then the current is enabled to flow between Tsunami pin to ground, which will result in a trigger to the drum sampler features. Each drum trigger gate will require a separate xtor circuit to protect the Tsunami board.
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![](https://s3images.coroflot.com/user_files/individual_files/613050_bpomzo6qvplnklqtbng7pk4wx.png)
PCB design. Here I've simply duplicated the schematic x 16 trigger junctions.
![](https://s3images.coroflot.com/user_files/individual_files/original_613050_sZQCN83_NVwQYQaKkJsSiTgs8.jpg)
PCB circuit trace. The same can be achieved using only 1 x 47k resistor on the gate input to the base of the transistor. So I'll be leaving the extra two resistor terminals unpopulated.
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![](https://s3images.coroflot.com/user_files/individual_files/613050_isbqsxktvohh9pcmvqde9w4ix.jpg)
for all those triggers. I'll use jumper wires between the Tsunami board and on all these 16 sets of standoffs x4.
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