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 Forum index » DIY Hardware and Software
ARP Odyssey Oscillators
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AndyR1960



Joined: Feb 16, 2007
Posts: 279
Location: Manchester UK
Audio files: 5

PostPosted: Fri Jun 06, 2014 11:36 am    Post subject: Reply with quote  Mark this post and the followings unread

patroche wrote:
The next is the seq ARP 1601


Now THAT'S something I'm definitely interested in Smile

If anyone can do it, you can - I gave up after 3 months (couldn't find the PCB foils)
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patroche



Joined: Feb 26, 2012
Posts: 13
Location: montelimar

PostPosted: Sun Jun 08, 2014 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

ok andy , give me your mail and i give you all my work !
Just a picture of my project
It don't run yet , because i have many vérification , before, on the sequencer.





Posted Image, might have been reduced in size. Click Image to view fullscreen.

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Last edited by patroche on Sun Jun 08, 2014 9:58 pm; edited 1 time in total
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Sebo



Joined: Apr 27, 2007
Posts: 534
Location: Argentina

PostPosted: Sun Jun 08, 2014 4:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

WOW, the sequencer looks awesome!!!
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Sebo
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My Music:
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www.myspace.com/cosaquitosenglobo
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isak



Joined: Dec 13, 2009
Posts: 689
Location: Israel
Audio files: 18

PostPosted: Mon Jun 09, 2014 11:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

thats really looks good man!
amazing work!

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isak



Joined: Dec 13, 2009
Posts: 689
Location: Israel
Audio files: 18

PostPosted: Thu Jun 19, 2014 4:00 am    Post subject: Reply with quote  Mark this post and the followings unread

hi guys.

i did the Vpp boost suggested by Andy on page 8.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

well, works great, i replaced the 100k to 51k and 50k trimmer so i can get it back to 10Vpp, that went out great.

as you see the signal is inverted, i want to invert it back to the original phase, i did a small scheme, someone here can please tell me if i did ok?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

cheers,
Isak E.

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elmegil



Joined: Mar 20, 2012
Posts: 1445
Location: Chicago
Audio files: 14

PostPosted: Thu Jun 19, 2014 6:16 am    Post subject: Reply with quote  Mark this post and the followings unread

I've more commonly see 10k or 20k used for the re-inverting op amp, but the layout is correct.
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isak



Joined: Dec 13, 2009
Posts: 689
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PostPosted: Thu Jun 19, 2014 6:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Smile

So 10k to 20k instead 100k?
Ok, I'll take that in mind.

Another thing..
When looking at the scope after the Vpp boost I've noticed that the waveform is no longer from 0 to 5V, it became, (+)(-), i guess it should be like that?
I'm wandering if I wasnt connecting the -15V would it still be (+)(-)?

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elmegil



Joined: Mar 20, 2012
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PostPosted: Thu Jun 19, 2014 7:04 am    Post subject: Reply with quote  Mark this post and the followings unread

2 x 10ks, or 2 x 20ks. both resistors have to be the same to have unity gain.\

It seems strange that an audio signal would be 0 - 5V; 5Vpp would normally be -2.5 to +2.5. I haven't gone back to look at the prior schematics, is there a DC blocking cap at the end of the prior stage?

In any case, don't try to run your op amp without the -15V rail. And a TL07X is not going to like simply trying to substitute ground there. You'd need a different op amp capable of doing single-sided supply. There are some LM amps (e.g. LM358) that can do that if you really feel you need to.
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isak



Joined: Dec 13, 2009
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PostPosted: Thu Jun 19, 2014 12:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi elmegil

Quote:
It seems strange that an audio signal would be 0 - 5V; 5Vpp would normally be -2.5 to +2.5. I haven't gone back to look at the prior schematics

the saw and the square are 0 to 5, in the ody vco, and 0 to 10 in the 2600 vco, this is the last time i checked.
in the 2600 vco only the Tri and Sine are (+)(-).

Quote:
In any case, don't try to run your op amp without the -15V rail. And a TL07X is not going to like simply trying to substitute ground there. You'd need a different op amp capable of doing single-sided supply. There are some LM amps (e.g. LM358) that can do that if you really feel you need to.

i think you miss understand me, sorry about that.
i meant to disconnect the -15V that connected to the 300k and pin 2 of the opamp.

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elmegil



Joined: Mar 20, 2012
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Location: Chicago
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PostPosted: Thu Jun 19, 2014 12:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry for the misunderstanding. Seems like a good chance of it working as you say....
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isak



Joined: Dec 13, 2009
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PostPosted: Thu Jun 19, 2014 11:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

elmegil,

I don't think there is a DC block.
I guess the the -15V and the 300k is for center it around zero.

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furio



Joined: Dec 25, 2009
Posts: 103
Location: Austria

PostPosted: Tue Jul 08, 2014 5:19 am    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
I don't think there is a DC block.
I guess the the -15V and the 300k is for center it around zero.

With +/-12V power supply, should the 300K be reduced by 10%, 20% or nothing?
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isak



Joined: Dec 13, 2009
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PostPosted: Tue Jul 08, 2014 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread

furio wrote:
isak wrote:
I don't think there is a DC block.
I guess the the -15V and the 300k is for center it around zero.

With +/-12V power supply, should the 300K be reduced by 10%, 20% or nothing?

i was right when i said..
Quote:
I guess the the -15V and the 300k is for center it around zero.

i didnt connect the -15V so there is no need for the 300k.
so it works perfect Smile

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furio



Joined: Dec 25, 2009
Posts: 103
Location: Austria

PostPosted: Tue Jul 08, 2014 9:08 am    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
i didnt connect the -15V so there is no need for the 300k.
so it works perfect Smile

So you do not just connect the 300K or even the -15V power of the TL072?
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isak



Joined: Dec 13, 2009
Posts: 689
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PostPosted: Tue Jul 08, 2014 9:17 am    Post subject: Reply with quote  Mark this post and the followings unread

furio wrote:
isak wrote:
i didnt connect the -15V so there is no need for the 300k.
so it works perfect Smile

So you do not just connect the 300K or even the -15V power of the TL072?


yep

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furio



Joined: Dec 25, 2009
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PostPosted: Thu Jul 10, 2014 12:19 am    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
yep

No, I tried!
The 300K resistor seems indispensable.
It also works well with 12V.
Not installing it, simply amplify the wave without centering.
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isak



Joined: Dec 13, 2009
Posts: 689
Location: Israel
Audio files: 18

PostPosted: Thu Jul 10, 2014 2:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Not installing it, simply amplify the wave without centering.

this is what i wanted, this is what were talking about here.

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