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 Forum index » DIY Hardware and Software » Developers' Corner
My project
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Fri Feb 03, 2017 5:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's looking very nice!

of course not playing keyboard is no excuse to not post any sounds Wink

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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Fri Feb 03, 2017 7:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

It sounded pretty bad, but here is a link to some sound.


https://youtu.be/jXKgTg2FknA
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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 04, 2017 12:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Still very impressive!
Well done Laughing
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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Sat Feb 04, 2017 5:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks grumble.


Things have moved slow on the DIY front lately.

A lot of banging my head against the wall.

Might be time to see what ideas I get from those more knowledgeable than myself

My idea was to build a very simple quantizer, just a basic parallel output ADC, EZ resistor ladder with .1% resistors to take 6 accurate bits and get stepped output. A couple of opamps to adjust to simitone volt per octave output.

Seems simple.

Turns out parallel output, through hole ADCs are not common ICs anymore.

Finally found ADC0802

After fumbling through a 58 page datasheet I about 30% understand, I ordered some in.

The problem I am on now. Is that for the IC to run in a free running state. It requires pins 3 and 5 to have a quick pull low right after power up.

It seems to work when I use a manual switch to preform the function, however when I try to set up a timed one shot to preform the function, sometimes it starts, sometimes it does not.

I'm not sure if the pulse is happening too quick, if the pulse is to short or long, or if the quick reference in not quite making complete ground.

If anyone has an idea to get past this problem? I am open to suggestions. Or if anyone has an ADC that would be easier to use in a simple circuit like this?

Yes I know a micro can be programmed to do it.

That would require me to learn to program a microcontroler.

And after large amounts of money on books, a class at the local college, every micro controllers made easy tutorial I can find.

My time would be better spent genetically engineering a flying unicorn.
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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 04, 2017 7:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I suppose you use the schematics like I added to this post?
I think you could use a resistor, capacitor and two diodes that replaces the switch to have the ADC started, just like the small diagram I added to this answer.
You just have to play a little with the values.


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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 04, 2017 8:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Or: you could use just use a diode that goes to the output of your mono (the Q- output I suppose...), with the cathode to the mono output and the anode to pins 3&5 of the ADC.
In this way the mono can drive the pins 3&5 to ground during the pulse and after the pulse has ended and is at logic high again, the interrupt output (pin 5 ) is able to pull Write low, and thus starts a conversion.
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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Sat Feb 04, 2017 9:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks grumble

I was sure someone would have some ideas.

I was avoiding using an extra IC just for this, however I was sure I could start it consistently with a 555. Though, I had not tried that yet.
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Sat Feb 04, 2017 11:29 am    Post subject: Reply with quote  Mark this post and the followings unread

sounds good to me Very Happy


quick question about the circuit for pulling the ADC pin low on startup, what does diode D1 do ?
Is it protection for when the power is switched off by discharging the capacitor through the power rail ?

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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 04, 2017 12:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Diode D1 discharges the cap C1 if the power is turned off, so every time the power is switched on its a new start for this little circuit.
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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Sun Feb 05, 2017 2:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

from the land of moon base
Came the nandulator kit
All prepared by PhoBos
For fish to solder it

Cfish he did solder
The solder smoke did swirl
When he was done the sound came on
And the lights began to whirl

The nandulator pulsed and droned
As cfish cracked a smile
The knobs he turned, the sounds they churned
This thing is really wild

Now fish is not a poet
He knows his poems shit
But he really likes his nandulator
And making sounds with it

So if you do not have one
PhoBos you should ask
The kit is fun to build
And doesn't cost much cash

Now it has became the time
For fish to have a beer
So I will quit annoying you
And get right out of here.



I built a case for it too. arrow party time!


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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sun Feb 05, 2017 2:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

salut
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Tue Feb 07, 2017 1:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am not a poet either
but I shall try to rhyme
and say you did a nice job
with the NANDulator kit

hmm that didn't really work
the way that I had planned
but I am happy to hear
that it pleased the fish

oh dear, oh dear, I fucked it up
for the second time
but before this poem is over
I will make it r...ight ?!

It seems I'm getting closer
but that's still not really it
anyway nice case you build
it doesn't look like.. ehm

wait, hold on, I almost had it
I'm getting really close now
just one rhyme that's all I am asking
hey, my cat just said meow

I'm just joking 'bout the cat
I don't have room to raise a pet
except for spiders in the kitchen
and maybe some behind my bed

but I'm drifting off, it's getting silly
and that was not my plan
so let me say goodbye for now
from the moon base land

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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Sat Apr 22, 2017 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

I have not had much time on here lately

Now that we have 4 sets down. Going to start integrating my synth pedals.

https://youtu.be/zctUCLm9FMo


We are still a little loose. But the local crowd is loving us and we ar booking up fast
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alanwilder81



Joined: Sep 03, 2016
Posts: 310
Location: italy

PostPosted: Fri Aug 04, 2017 9:36 am    Post subject: Reply with quote  Mark this post and the followings unread

hello folks,

I am back to DIY after a while.
Today i came across the Jupiter 4 VCF discrete version schematics.
Thing is i simply thought it only existed the the IR 3109 unobtanium chip version, but to my joy, i realized i can finally implement this wonderful filter i've drooled over forever.
Has any of you chaps built it?

question is about the red circled CA 3080 OTA, in the VCA section following the VCF in the signal path.
How do i go about pins 7 and 8? How does that triangle symbol translate into real world?

i assume the pin 6 is connected to pin 7 , and then another separate wire connects to pin 8.
I first assumed pins 7 and 8 were shorted together Rolling Eyes but i must have been wrong on that.

many thanks for any infos !


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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
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PostPosted: Fri Aug 04, 2017 10:20 am    Post subject: Reply with quote  Mark this post and the followings unread

alanwilder81 wrote:
question is about the red circled CA 3080 OTA, in the VCA section following the VCF in the signal path.
How do i go about pins 7 and 8? How does that triangle symbol translate into real world?

The triangle would be an internal buffer. However, the CA3080 doesn't seem to have one. It actuallly looks more
like an LM13600/LM13700 but the pinout of those doesn't correspond with the circuit diagram. You are correct
that pin 6 is connected to pin 7, and then another separate wire connects to pin 8.

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alanwilder81



Joined: Sep 03, 2016
Posts: 310
Location: italy

PostPosted: Fri Aug 04, 2017 10:30 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks Phobos,

i'll attach the whole Roland Jupiter 4 VCF schematics so you can get a better grasp with it. At that time( 1978) they only employed the 3080 OTA.

By any means people say the 13700 can be a perfect replacement for the old 3080, in all Roland VCF 's circuits.
what do you think ?
cheers! Wink


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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Fri Aug 04, 2017 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

I don't know about ALL Roland VCF's circuits but generally, yes, you can replace CA3080 with LM13600/LM13700.

edit: ah this is nice to know.

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alanwilder81



Joined: Sep 03, 2016
Posts: 310
Location: italy

PostPosted: Fri Aug 04, 2017 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks Phobos Wink
i will read that very interesting article !
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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Aug 05, 2017 6:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Found it! It's an NE5517 or AU5517 dual transconductive amplifier.
The datasheet: http://www.onsemi.com/pub/Collateral/NE5517-D.PDF

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alanwilder81



Joined: Sep 03, 2016
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Location: italy

PostPosted: Sat Aug 05, 2017 8:15 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks Ed, precious infos. How did you find it ?
did you take a look at the Jupiter 4 manual, or you searched for the dual OTA's that were available at that time, in 1978 ?

my question is, how does the VCA NE5517 OTA differs from the CA3080 OTA used for the filter ?

does the NE5517 have a built in buffer then, just like the LM13700 ?
can the latter replace the NE5517 ?
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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat Aug 05, 2017 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Just googled for operational transconductance amplifier and selected pictures(?) and looked for a diagram or picture with the same pin layout.
I'm on a holiday right now (and the 3 weeks to come) and have very limited i-net if any so maybe someone else might compare datasheets for you?
Finding the right datasheet for you took me ages....
Good luck!

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alanwilder81



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PostPosted: Sat Aug 05, 2017 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

i might have found the answer Smile

according to the description...

" Therefore, changes of output offset voltages are almost eliminated. This is an advantage of the NE5517 compared to LM13600. With the LM13600, a burst in the bias current I ABC guides to an audible offset voltage change at the output. With the constant impedance buffers of the NE5517 this effect can be avoided and makes this circuit preferable for high quality audio applications "

it looks like this is a specialized VCA for avoiding fast attack thumps.
Fine tuned to suit that scope.

anyway, Ed have a nice holiday. i'll keep digging, thanks for the valuable help as usual.stay tuned !


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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat Aug 05, 2017 8:39 am    Post subject: Reply with quote  Mark this post and the followings unread

salut
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Cfish



Joined: Feb 24, 2016
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Location: Indiana

PostPosted: Sun Feb 16, 2020 4:05 pm    Post subject: Rig mutation Reply with quote  Mark this post and the followings unread

So my rig had a big mutation, but now it gets used out all the time


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AlanP



Joined: Mar 11, 2014
Posts: 746
Location: New Zealand
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PostPosted: Sun Feb 16, 2020 9:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good to see you again, and I'm really diggin' the bass pedals!
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