Can you get it to work with the MCP4725?
The original project has the MCP4726 and from what I’ve been researching the XX25 and XX26 are a little different.
I used this schematic: GitHub - luislutz/Arduino_Quantizer: Eurorack format Quantizer with Arduino Nano
I still haven’t built it though… so unsure if it works
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Nice. I’ll probably build this one at some point using your layout. I need to build a sequencer before that. Thank you for sharing it!
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Long time reader, first post and stripboard layout attempt.
Electric Druid stomp LFO, as per example circuit in the datasheet.
It is aimed towards stompboxes, but might be handy for a lot of different projects. I looked into it, to maybe add to a ciat lonbarde rollz-5 project.
The chip has 8 different waveforms, including random level and random slope, which was what I found interesting.
As said, this is my first attempt at laying out a stripboard design from a circuit diagram, so it is unverified!
Please comment if you notice something weird. That would be very much appreciated!
Looks good to me, I use Electric Druid TAPLFO3, Noise2 and EnvGen8C chips extensively in my designs.
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Thanks for taking a look!
Nice to hear from someone with experience with the Electric Druid chips. I’ve been close to buying some of them many times, but didn’t feel confident enough to layout a stripboard design to utilize them.
They promise a lot a functionality in small packages!
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Here’s an attempt of laying out a stripboard of the vactrol part, of adding CV control (variable resistor).
The trimmers are for the adjusting Offset and scale.
It is based on “VAC PAK” schematics I found somewhere in this forum.
(If you’re in the states, it makes more sense to buy the Synthrotek PCB’s, but it’s really expensive to get shipped to the EU…)
Again unverified!
And yes I known there’s different (and strong) opinions of the usability of the vactrol approach…
Someone on MiaWs discord was asking about attenuverters, realised I only have attenuators so put this together from Befacos schematic.
Chosen because it has offset.
Some notes put on the image but ask away.
Original Schematic/BOM
https://befaco.org/docs/Dual_Attenuverter/
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I built Offset-O-Matic a while ago for a similar purpose. It is an attenuator with variable gain, an inverter with variable gain, a buffer circuit or impedance converter and an adder allowing you to add or subtract a DC offset to a signal. An offset circuit is especially handy if you send a CV to a vactrol. The DC offset voltage will give the LED a bias voltage, and the AC part of the CV signal can then be used to modulate/control its brightness.
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Do you have any experience linking two of the Electric Druid LFO chips, whereby the frequency of both chips is determined by one potmeter? Are the chips precise enough to have exactly the same frequency when fed by the same voltage source?
Basically they are microprocessors and the inputs are ADC, as long as there is no jitter on the inputs I would say they should be accurate enought, I use a relay in my bi timbral synths for the LFO rate, when in whole mode both upper and lower LFOs receive the same control CV to ensure they are in sync.
Yo ucan also synv the output of the first with the tap input of the second, with both LFO rate CV and the sync they should be solid.
Thanks! I just ordered some chips from Electric Druid, including some StompLFO chips. I am looking into building a module with one fixed square wave out to be used as a clock source (chip 1), and a second LFO with various wave shape outputs (chip 2), where the frequency of both is determined by the same potmeter, whereby both outputs are therefore the same linked frequency.
When the chips arrive, I will do some testing and report back.
The taplfo3 already has a squarewave output seperate from the main LFO out
Oh really?!?! Thanks! I will take a look at that chip, because it sounds exactly like what I am looking for!
Yep, pin 7 clock out, pin 5 PWM out for the real LFO after smoothing. I use the clock out for driving the LFO speed LED normally and syncing with other LFOs
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you could just ask at https://electricdruid.net They are really nice people there. Tom was helping me to add VC inputs to the digidelay stompbox, turning it into a Kosmo module.