Synthrotek FOLD - DIY Build
As 2020 comes to a close, we wanted to finish up one more build. The guys over at Synthrotek sent over their new FOLD module, which is a dual function module in eurorack format. The FOLD is one part ring modulator and other part wave folder that can take both audio or CV sources. The FOLD is available as a fully assembled module, a PCB/Panel combo or the DIY Kit that we will be reviewing and building here.
On with the build ... The Logic Board
First up are the resistors and there are a lot of them. While they are non-polar (direction doesn’t matter), its important to make sure you are identifying the resistors correctly. Synthrotek did a great job with their visual BOM as it shows exactly what component goes to what area on the PCB. They also have a cool resistor band identification tool that you can download here.
There are 47 resistors and that means take your time when identifying and placing them. When we were unsure, we used our component tester that we have in the shop. Once identified, we placed them into the PCB and lined everything up to solder. We used a top-down soldering technique which kept us from us having to flip the board over and over. When we were done with the top section, we flipped the board and reflowed solder so that our solder points were perfectly placed.