Measure the pins 10 and 14 of the MCP4922, they should read voltages 0.5V depending on the note you press. The "MCP4922" chip is responsible for generating the voltage for oscillators. If you can trigger note via MIDI (no matter what pitch), then the atmega is definitely working (and also the crystal - MIDI baudrate is 31250 which gets clocked from the crystal). I'm not sure you can read the frequency on the crystal like that. Does this sound like a problem with the atmega itself? I have 5v to the atmega and 0v at pin 8, so no obvious shorts. I don't have much experience with atmega or any digital circuits, but it seems that the crystal isn't oscillating (no reading with frequency counter at pins 9 or 10) I've replaced the crystal, but this had not helped. My midi still isn't working properly, my keyboard triggers the same note on every key. Mattbartlett303 wrote:Hi I'm after a bit of advice. Check to see if you left out the correct one? I think you should double check that you don’t have that 470p cap on. And I definitely can retrigger at any time. My max attack and max decay are the same. (these are best tested with the cutoff set to minimum, env lvl to maximum, and the env output patched into the vca input) could anybody with a lil erebus check if their envelopes are showing similar behavior? I suspect that the last item is probably normal. the envelope won't retrigger while the decay phase is still lasting. maximum decay time is much longer (ca 6s) than maximum attack time (ca 2s).Ĥ. with high attack and only slightly lower decay settings, a very short gate signal will often result in the envelope not decaying at all, but staying high until re-triggered with a new gate signal.ģ. even with decay set to minimum, there is still some noticeable decay time.Ģ. i'm not sure if these are just some quirks of this envelope design, or if there is something wrong with my particualr build:ġ. i love that creamy filter and the very playlable delay section.īut the envelope seems to be behaving a little strange in some ways. So all in all a nice addition to the modular synth, but it would be nice to just take a direct filter output and use an external VCA, or just mix it in with other audio before the VCA.Īll music in the video was done only with the Lil’ Erebus.Bartleby wrote:i've finished my lil erebus, and everything seems to be working fine. If you use this with a modular synthesizer it’s fine since you will have more oscillators and LFOs and this is just in addition to those. This gives you a sawtooth and a square wave and that’s it. Just slowly fading it would hold the note longer, then suddenly fades very quickly.Īnd like the Polymoog, you have only a single waveform for each oscillator. ![]() ![]() I patched on in and found it didn’t work the way you would expect. ![]() There is no envelope generator for the VCA. There are loud clicks when you let go of a note. However it’s definitely not a synth for everyone or all situations. It has a nice fat, buzzy analog sound that I really like. One cool thing is when you add resonance the low frequencies don’t go away like they do with most low pass filters. And I did a time lapse video of the build! I’ve heard good things about the Dreadbox synths so when they announced the Lil’ Erebus kit I grabbed it.
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