Recently I have finished another (and for a while final) MFOS Ray Wilson designed noise box. This one was slightly complicated compared to the previous two (Alien Screamer and the Weird Sound Generator), but it is still a relatively straightforward build if you have basic electronics knowledge.
The PCB came from “Soundtronics UK” and all parts came from AliBay. Here is how the build went in pictures with some reading.
This is the fully populated PCB, nothing extra complicated in it, apart from that you need to know which way an electrolytic capacitor goes. It is a good time of thinking about colour coding of your wires, if that is something you want to think of (troubleshooting is easier if you use more colours)
Designing and making the faceplate. I have cut and drilled the plate (not with that knife) by hand. I have designed the layout by rejigging the original faceplate drawing. After drawing the graphics, it has received 3 layers of clear sealer. Note to future myself – the permanent marker is not so permanent when it comes to contact with the liquid coating…
This is the faceplate wiring and coupling it to the PCB. I have followed the wiring diagram from the MFOS site, although obviously the buttons on my one has a different layout. I have not made a separate wiring schematic, which might would have been advisable, as time to time I got confused quite a bit what is where. Eventually I have connected every loose ends.
Here I am building the wooden case, I have mostly used scrap wood lying around. The speaker is a standard 8ohm speaker, it sounds terrible, but it does the job and the machine itself is not exactly a Moog either… Definitely fits to the synth. The PCB design includes a little LM386 based amplifier so a maximum of 10ohm speaker can be connected. There is an audio output as well.
I caged the speaker tower and used solid core exposed wiring. I was aiming towards the post-apocalyptic(ish) look.
Here we have the finished article. I have made a little recording session, discovering all the sounds you can make with this. I have processed the recording with some reverb and halved the playback speed. (according to Hainbach, everything sounds better on half speed, and he is not wrong)