Tag: reverb

Synthrotek FOLD – DIY Build

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. 

Synthrotek Logo

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. 


Synthrotek VERB – DIY Build

Synthrotek VERB- DIY Build

As described by the Synthrotek site, “the Synthrotek Verb is a reverb module like no other. This three PT2399 unit offers a warm tape saturated spring reverb like sound but with the added flair of the subtle modulation which truly makes it shine.” This was enough for us to decide to take on the VERB on for the next build of September 2020.

Unlike a lot of other reverb modules, this one does not require a “tank” to produce its reverb. It relies on the x3 PT2399 circuits that were previous utilized in other delay modules. 

The PT2399 is back … again.

We won’t go into all of the technical jargon like we have in previous builds (see Synthrotek DLY and Waveform Magazine Delay builds), but we will say that the PT2399 is a very versatile IC. It can be used for delay’s, echo’s and even reverbs (as this module uses them).

To keep it simple, the IC takes in analog audio input and converts it into digital stream of bits to add a digital delay to it. This audio delayed audio signal is then provided as output (ie. perfect for these module types).

On with the build ...

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