why does my synth do this?



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why does my synth do this?

Postby comesect2.0 » Tue Jan 10, 2017 9:43 pm

someone know just from hearing this thing cycle down where/how/why in the circuit it is allowed to do this?

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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 12:40 am

if you cant listen to 30 seconds, it cycles down when turned off, ....why.
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Re: why does my synth do this?

Postby rfurtkamp » Wed Jan 11, 2017 12:46 am

Is that including the stuff in the chain after it?
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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 1:14 am

no no, the synth itself powers down instead of just going dead quite when powered off, and at the end of the clip you can see the indicator light is off and the sound is powering down...
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Re: why does my synth do this?

Postby rfurtkamp » Wed Jan 11, 2017 1:39 am

Realistically, it's not a hard cutoff - it finishes current waveform etc. before dying out.

If you want a hard shutoff, just put a volume pedal or killswitch after it.
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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 1:41 am

I love the way it works, guess i'l just type a bunch of different words into Google that will point me in the right direction.
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Re: why does my synth do this?

Postby wfs1234 » Wed Jan 11, 2017 3:40 am

Maybe it has something to do with built-up power in the capacitors discharging? But I really have no clue. :idk:
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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 3:50 am

Thanks, figured somthing along the same lines...there's like 6 different little vero boards inside, crazy build...when playing it compared to all the others it's the only one where I wonder how it's composed inside..the 4 bottom knobs are like rate controls only react with each other to create rawring patterns with two tone controls that end up when fully tweeked making random chipping sounds...I've noticed the oscillator itself with all controls down is the fattest thing I've ever heard by the way it effects pedals
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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 3:55 am

And since this thread is "why does my synth..." I once had the same synth hooked up but turn off, amp on and all...I was changing my bed sheets 2 feet away, and when I pulled my sheets off, the oscillator sounded, went up high then died down due to the static off my sheets.....that was a revelation.
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Re: why does my synth do this?

Postby vidret » Wed Jan 11, 2017 9:04 am

yeah i've seen some noiseboxes have this as a feature; when turned off they pretty much starve down (not voltage, but.. cap discharge? dunno) or sometimes they have a volume killswitch for it as they turn off.

sounds crazy :thumb:
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Re: why does my synth do this?

Postby crochambeau » Wed Jan 11, 2017 9:39 am

wfs1234 wrote:Maybe it has something to do with built-up power in the capacitors discharging?


Yup.

I'd guess that each little vero board has a decoupling cap on the power rail, and they discharge at different rates due to the various circuit loads and settings which results in the wandering when power is removed.

If ever you want to avoid that feature a kill switch on the audio output will offer abrupt mute functionality.

(I know, I know, I just repeated what vidret said - need to get caffeine BEFORE surfing)
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Re: why does my synth do this?

Postby cloudscapes » Wed Jan 11, 2017 9:54 am

wfs1234 wrote:Maybe it has something to do with built-up power in the capacitors discharging? But I really have no clue. :idk:


This is correct.

A lot of builds builds have this built into the design. The cacophonator is one I can think of:

http://www.theremin.us/Circuit_Library/ ... ator_1.gif

That big 2200uf cap near the bottom left. Your build probably has something similar.
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Re: why does my synth do this?

Postby comesect2.0 » Wed Jan 11, 2017 1:34 pm

crazy cool, thanks you all.
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Re: why does my synth do this?

Postby moid » Wed Jan 11, 2017 9:04 pm

cloudscapes wrote:
wfs1234 wrote:Maybe it has something to do with built-up power in the capacitors discharging? But I really have no clue. :idk:


This is correct.

A lot of builds builds have this built into the design. The cacophonator is one I can think of:

http://www.theremin.us/Circuit_Library/ ... ator_1.gif

That big 2200uf cap near the bottom left. Your build probably has something similar.


That cacophonator looks cool! Is there anyway that the circuit could be used to process incoming guitar signal, or would it only work as a standalone synthesiser? I realise the current circuit is a noisemaker on it's own, just wondered if and where another signal could enter and be modified by it... or not.
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