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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
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Posted: Thu Dec 13, 2018 3:37 pm Post subject:
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to the forums.
Not sure how it is supposed to sound .. it seems to be too clicky at the start maybe?
Anyway .. a schematic would be useful. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Steveg
Joined: Apr 23, 2015 Posts: 182 Location: Perth, Australia
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Posted: Thu Dec 13, 2018 4:16 pm Post subject:
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Hi and welcome zappitron.
I not hearing anything unusual from your track. It sounds like a logic noise "drum". Perhaps your headphones are altering the sound? The most likely thing is that they are acting as a low pass filter ... either they have a bass boost or the headphone coils are filtering high frequencies?
Try adding some simple low pass filtering to the output and see if that reproduces what you hear in your headphones. |
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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Posted: Thu Dec 13, 2018 4:53 pm Post subject:
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Hey, thanks for the replies guys!
Exactly this is the pickle, I know how it sounds from when I'm listening while tracking. But there is no way to let you hear that cause when I play it back I have this, sort of 'smacking' sound.. It's the sound that comes in after a few seconds. I only know it from low quality mp3's, they used to have the same. Some sort of digital distortion or clipping? But it's not constant either.
It's the strangest thing, it's not there until after the drum has been recorded..
this is the schematic only I didn't use the 40106 part, instead it gets a gate from a 4015
https://hackadaycom.files.wordpress.com/2015/03/drums-sch.png?w=800&h=395
Your help is much appreciated! |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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Posted: Fri Dec 14, 2018 1:58 am Post subject:
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Man! I cant believe I missed that Ha, thanks Grumble! I will get cracking then and ad that cap.
Thanks for the link as well, I need to read up on that. Try to get a better grasp of things |
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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Posted: Fri Dec 14, 2018 4:01 am Post subject:
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Hmm.. that didn't do it. The kick does sound a lot nicer now But it's still there.. I made a new clip and looked in audacity and the beats that have it do look a bit mangled. You can hear it really clear on headphones. It comes in after a few beats.
Sorry if I'm boring everyone to tears with this but I just want to understand what is happening and hopefully learn something
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
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Posted: Fri Dec 14, 2018 2:07 pm Post subject:
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zappitron wrote: | I went over the circuit today and drew out exactly what I've done. |
Okay .. so you did not ground the two unused inputs and you did not put a decoupling capacitor over the two supply pins? You should do that.
Also .. do you use a battery supply maybe? In this case also add like 100 uF or so over the battery ... to be done near the IC.
This should solve the strange phenomena ... and it may get rid of the starting glitch too .. so a recording might just work then. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
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Posted: Fri Dec 14, 2018 2:16 pm Post subject:
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Also you could place two caps from pin 3 and 11 of the 4069 to ground (10nF) _________________ my synth |
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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Posted: Fri Dec 14, 2018 4:07 pm Post subject:
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Hey, I should've mentioned that I did all that, straight out of the Lunetta for noobs guide
So 100k from unused inputs to ground, a 0.1uf decoupling cap for the chip and a 100uf capacitor for the circuit between + and ground. I'm powering things with 5v. 9v coming in trough a wall wart and then with a L7805 voltage regulator down to 5v.
I placed that extra cap between pin 3 and ground but not yet between 11 and ground, I'll try that tomorrow. I'm gonna let it rest for now, I'm starting to hear the thing even when it's not playing
Thanks a lot for the help! |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
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Posted: Fri Dec 14, 2018 4:18 pm Post subject:
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Okay then its not what I thought it to be ... the word "exact" made me confused a bit
Could you record it on something "not a computer" to see how that works out? (prolly being too old-fashioned there .. but I do have stuff like cassette recorders )
And what Grumble said of course _________________ Jan
also .. could someone please turn down the thermostat a bit.
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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IGR
Joined: Aug 31, 2014 Posts: 19 Location: Brno
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Posted: Sun Dec 16, 2018 2:03 pm Post subject:
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I guess you have a too long trigger pulse going from shift reg. Just try hook up a monostable with time constant about 5ms, positive near pulse. The size of the capacitor at the drum input is either small, you get one positive spike althought low energized and negative spike at end of pulse remains negligible. Or, the capacitor is big enough, the spike at the rising edge has enough energy,but the negative is audibly present and affects the sound.Similarly as yours samples, sounds the twinT circuit when it is directly connected to 4017. Better solution is to connect AND gate with one input clocked with short (5ms)sync pulses.
Good luck.http://electro-music.com/forum/images/icons/icon14.gif |
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zappitron
Joined: Dec 13, 2018 Posts: 10 Location: Brussels
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
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Posted: Thu Dec 20, 2018 5:26 am Post subject:
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zappitron wrote: | [...]I have no idea how many ms the triggers are though.[...] |
Time constant of R2 * C1 is 87e3 * 27e-9 (when I read the values correctly from the schematic) .. or roughly 2.5 ms .. the trigger will be a tad longer than a time constant .. say .. maybe 3 to 5 ms -> repeated triggering should be possible at like 100 times / second or so -> something else is preventing it. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
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