Відео

Hey, welcome to the world of Eurorack 😀 First of all you will need a good power supply that can output regulated +12VDC and -12VDC to power your module. Next you need consider what signal levels you can input to the module and what signal levels you get out of the module. In general Eurorack modules have a input signal range of +/- 5 VDC and the same levels are outputted from the module. These are quite high signal levels compared instrument or line levels, the safe (but more costly) option would be to connect an input module and an output module with the filter in between. But you could probably get some kind of LP filtering going by just inputting line levels directly into the filter and sending the output from the filter to the next unit in the signal chain.

The knobs will act as faders, but keep in mind that the middle position is "0" (max attenuation) and the full CW is max level. Turning the knob to full CCW will also give max level, but with the signal is 180 degrees phase-shifted(!) I don't have any audio mixer in my Eurorack case (yet), so I use an Utility Mixer for this purpose, but it is a bit awkward to use when you need to bring down a level to 0 in a mix.

I would suggest to use a triangle waveform as a CV signal when you are testing. A square wave isn't really gonna help you troubleshoot the exp output - it's better to use a linear waveform like a triangle (or a sawtooth). Keep in mind that the control input on the OTA is a current input and if you exceed ~2 mA the chip will break down. Measuring the current on the exp output is also a bit tricky, especially if you measure the voltage levels and have the OTA connected, but I guess that you could measure across the 20k resistor with a multimeter and calculate the current. Finally; building this circuit on a breadboard (or stripboard) is really difficult. The LM13700 operates with really small signal levels and I barely got it to work on my breadboard setup. I didn't get good performance until I made the PCB.

@@MeeBilt Thank you so much!! I finally replaced the transistors with other units of the same specification and got it working. Thanks for the advice! Now it's time to design a decent board. I could barely fit all the components on a 10 HP panel since I did it with two CV inputs per channel. I just started building my own modular synth a month ago, and your channel is helping me a lot. Once again thanks for your work.

@@oscarpastor4439 Awesome, welcome to the fun world of Synthy DIY. Good luck with your builds!

I haven't tried that myself, but it probably works fine too, I would imagine.

The hex nut on the pots fits a standard 10mm hexagon socket that you can find in any tool/hardware store. The tool for the knurled nuts were bought at Thonk (www.thonk.co.uk/shop/thonk-knurled-nut-driver/)

Thanks

I think that there are BAV99 clamping diodes on all inputs and outputs. dl.modulove.de/module/arythmatik/ibom.html

I have actually tried this but I could not get the needed strength and precision. Discussed it a lot with the manufacturet, but they could not help me. But I will keep on searching.

@@MeeBilt the other option is antistatic spray.

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Thanks a lot for the nice words. I'm happy that you find it useful!

it the diode clipping mod from the neinohnein documentation

The binary files used for the ROMs can be found here: github.com/tkilla64/eurorack/tree/main/misc/roms You can extract the data from them or convert it to a header file that you can include in your program - it depends on what you want to do

Cool, yeah that's one way of doing it.

@@MeeBilt the Moog memory did that also with 8 bit ic's (dac) some 30 or so years back. you see it in the schematics.

@@MeeBilt This 64 mb memory chip from AP memory, i told you about is indeed used in phones, a known brand. I'm really interested in getting that chip going.

Hi, Is the power supply project you sent suitable for powering this project? And can I use this voltio module as an instrument pedal? That is, can I octave and transpose the sounds when I connect my guitar? In short, can I use it as an instrument pedal?

@@serhatdemir2714 No, the Voltio will only produce control voltage signal, not audio from your guitar.

It's an old one that I bought 30+ years ago from Spectrol, but this should be similar I think: se.farnell.com/vishay/008t000/trimmer-adjustment-tool-w-clip/dp/1687979

@@MeeBilt thx

Yeah, it's not a complicated build, but there are a lot of components 😅

I need to build my first one. It’s such a dense build so I am a bit intimidated by the silk screen. 😅 Also need to order the special parts. But it sounds great in your video. So really tempted to start.

I just finished my second one, and it would be near impossible without the ibom - the silkscreen is really difficult to use. It's even hard when you have the ibom as a guide! Best of luck with your build!

Thanks!

It's already available on the channel

Thanks a lot!

Thanks a lot! You're welcome.

I use a solderpaste with a melting point around 183 degrees C. I don't know the brand (it's chinese)

@@MeeBilt thank you so much!

You're welcome! 😊

Yes, I fully agree!

It can!

I have a cheap "sacrificed" breadboard that I only use for soldering pinheaders onto Arduinos, RPi Picos and component adapters. Sofar the BB have been keeping up quite good - but I try to solder the pins as quick as possible to avoid melting the plastic.

Great idea!

Thanks Anders, yes I'm planning to make something like that too.

Thanks!

Thanks a lot!

If there is a demand for that I will do it.

Sure, do you have that at home? The carbon filter will catch the fumes good enough for hobby purposes

Overkill is my middle name 😄😅

Thanks! Welcome 😊

Because it's fun...?

Button pretty.

Thanks