I started assembling the #Turbokit replica for my #GEM S2. I had some troubles soldering the tiny 8-resistor networks but I managed to do it in a reasonable amount of time. I just ordered a 4-resistor network in the wrong package and some connectors and the EPROMs are still missing. A nice board, I like it, I hope it will work 😅

I received a few days ago the 4-layer board I designed for the #Generalmusic #S2 #Turbokit replica. It looks very nice, let’s hope it works 🙂 I will assemble it in the next few weeks, then I will try to install it on my keyboard.

In the meanwhile, I sent the order both for the components that remain to be sourced and the PCB. Now, I just have to wait. #Turbokit #Generalmusic

I corrected some errors and I think I reached what I think it will be the v1.0 design of the #PCB. I hope it will work! #Generalmusic #Turbokit #electronics #DIY #Synth

@brouhaha The S2 already uses a WD37C65. The #Turbokit upgrade specifically requires to swap it with a uPD72064. I think the newer software in EPROM (to be installed in the external board) explicitly requires some of its advanced features. I tried to source one, I will check it when I will try to install the upgrade. Let's hope it is not a fake!

I'm not very experienced with the routing of a 4-layer PCB but it is fun. The different copper layers are starting to look nice! #Turbokit #Generalmusic #Electronics #Diy

I created a GitHub project for the #Turbokit replica for the #Generalmusic #S2. It is not a project for the faint of heart, however, at it will require to modify the original boards of the #synth. It is still pretty much an ongoing project: https://github.com/DarwinNE/GEM_turbokit #openhardware #electronics #diy

I realized I swapped the position of the left and right connectors that will be connected in the original EPROMs sockets in the #GEM #S2. I'm glad I checked, that would have been an expensive mistake to fix... #electronics #DIY #PCB #Turbokit

I resumed working on the #Turbokit replica for the #Generalmusic #S2. I tweaked a little the 4-layer PCB and got a quote from a well-known company: the estimated cost is US $81.87 for 5 PCB's. 2-layer boards would have been less expensive, but the circuit was too complex and I couldn't route it. #electronics #diy #synth

After a few iterations, I could slightly shrink the #Turbokit card. Now it should fit. Or at least I hope so, there are a few capacitors below the upper part of the board that can create problems. I may try to print a test on paper to see how it would fit on the real thing. #DIYelectronics #Generalmusic #S2