The FV-1 module is equipped with several resistors, LEDs and resonators. Converting to stereo is easy because you only have to double the op amp circuit.

I bought the DIP module from a Japanese EC site. The link is on my blog. It seems that overseas shipping is not supported. I haven't tested the limitation.Thank you!

Is it an IC laser marking code? Then any code is fine. It is probably the number that indicates the production lot.

@@HAGIWO ok

I bought a KiCAD reference book and am studying.

It seems that the charge pump circuit inside the OLED or the I2C communication emits noise. The charge pump noise can be reduced by adding an electrolytic capacitor to the 5V power supply, and the I2C communication noise can be reduced by reducing the communication frequency or adding a limiting resistor to the communication line.

It is printed on an adhesive sheet with a home printer. kzfaq.info/get/bejne/o9p4apWKz8nYZX0.html

I bought the arduino from Ali Express. Recently, the supply of semiconductors has been low and the price seems to be rising. I bought the FV-1 from a Japanese e-commerce site, but it is also sold on ebay.

@@HAGIWO Please don't share our Japanese FV-1 source, lol. I love how I can take the train 40ish minutes and grab one in person.

AliEx Arduino Nano's have gone up to €6 and a bare unsoldered FV-1 is about €45 😞

@@massimookissed1023 FV-1's have risen a lot in price over the last couple of years. I suspect its increase in popularity, espcially among a lot of guitar pedal manufacturers is part of the reason.

nonsense, if it will be on smd, it will be difficult for someone to make it. I hope he doesn't do it and will stay with the old version as of now

I would like to try PCB design. However, since it will not be mass-produced, there are no plans to make it with SMD.Thank you!

@@HAGIWO TH is fine for these I think, although many DIYers prefer using SMD these days, especially the larger 0805 size which is pretty tollerable even to my old eyes. I'd love to see more of your work in PCB though either way.

​@@marekhorvath3148 SMD doesn't have to be CRAZY tiny, and once you get the hang of it I actually consider it quicker & MUCH less stressful if a component has to be removed later or something... No pumps needed or worry of overheating components/pads/pulling traces, etc. The PCB's can be smaller & thinner, and with more components, for a cheaper overall price. These are especially relevant in Eurorack when module-depth is very important! Less solder waste as well, and component/soldering-prep (bending & trimming TH leads, having to use a ton of rosin flux, etc) is minimal compared to through-hole components-in fact, one of the BEST techniques for standard SMT components/IC's is actually easier than TH: The key is to only solder ONE leg of the SMT part using a pre-tinned pad on the PCB, then it's perfectly held in position & sturdy, AND you can do all of this with the PCB laid flat and not needing a "Helping Hand" or some crazy tape/bent-leg positioning system or a flipped PCB. So you can focus on soldering the rest with both hands available without worrying about it moving... - Pre-apply a small dab of solder (aka "tinning") onto just one of the empty PCB footprint pads, I usually start with the GND. ⚹_(or if it's an IC with 3+ legs, pre-tin two pads at both ends/corners of the same side, so the part doesn't wobble when heating)_ - Pre-apply a bit of Flux onto all of the other footprint pads. This is made effortless with a liquid flux pen! - Then you literally just hold the part in-place with tweezers using one hand-a "reverse tweezer" works well, or just holding the part in position using tweezers And with the heated iron in the other hand, *simply touch the IC's leg onto the tin for 1-2sec until the dab melts, and the part will easily "fall" right into place! That's it. You don't even need or want to apply pressure against the leg of the part at this size; it's a *tiny* lead with no real heat-stealing capability like some THT, it's a tiny surface pad that doesn't require the same "pre-heat before solder" as with double-sided, plated through-hole pads. Just because it has a bad reputation and you don't want to expand your own skillset doesn't mean we should all go without the benefits of using them (or both)!