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 Forum index » DIY Hardware and Software » fonik's place
Voltage Controlled OpAmp RingMod (Modulator)
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kkissinger



Joined: Mar 28, 2006
Posts: 1216
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PostPosted: Fri Nov 19, 2010 5:34 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
wow!
that demonstration is awesome!

BTW did you try the VCmodulator for control voltages as well?


Thanks!

I will try out some control voltages with it and I'll let you know how it works out.

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brother303



Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany

PostPosted: Fri Nov 19, 2010 7:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Fonik,

one question on the power supply : 12V possible without changes in any values? Schematics says "15V".

Best regards
Greg
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Nov 19, 2010 1:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

will work with 12V without any modifications.
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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
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PostPosted: Fri Nov 19, 2010 6:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

A couple photos. Thanks so much for sharing this module!

Edit - not sure why they're being rotated when I attach them.


RM1.JPG
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RM1.JPG



RM2.JPG
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RM2.JPG


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brother303



Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany

PostPosted: Sat Nov 20, 2010 1:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

fonik wrote:
will work with 12V without any modifications.


Thanks lot!
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crashlander42



Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)

PostPosted: Sat Nov 20, 2010 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I wish I ordered two of these. It sounds great!


ringmod.JPG
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vc ring mod in my crappy looking but functional modular
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ringmod.JPG



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numbertalk



Joined: May 05, 2008
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PostPosted: Sat Nov 20, 2010 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Spent a lot of time playing with this module today - loving it. Attaching a short sample.


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brother303



Joined: Nov 02, 2010
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Location: ruhr-area/germany

PostPosted: Thu Nov 25, 2010 7:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

pcb arrived safely,thanks for fast shipping!

Best regards
Greg
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XCenter



Joined: Oct 01, 2005
Posts: 108
Location: Germany

PostPosted: Thu Nov 25, 2010 8:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Same here.
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TekniK



Joined: Aug 10, 2008
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PostPosted: Fri Nov 26, 2010 12:28 am    Post subject: Reply with quote  Mark this post and the followings unread

crashlander42 wrote:
I wish I ordered two of these. It sounds great!


May i ask you where you did buy the knobs with orange and white caps?
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XCenter



Joined: Oct 01, 2005
Posts: 108
Location: Germany

PostPosted: Sun Dec 05, 2010 8:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot.
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Sun Dec 05, 2010 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

XCenter wrote:
Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot.



2n3906...
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XCenter



Joined: Oct 01, 2005
Posts: 108
Location: Germany

PostPosted: Sun Dec 05, 2010 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Is this a substitute to the 08 or have I missed s.th.?

...

[edit]

Doooh! Thx for opening my eyes. It HAS to be the 2N3906. Embarassed

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tommi



Joined: Dec 05, 2007
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Location: Italy
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PostPosted: Wed Dec 08, 2010 12:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Why am I always late for fonik PCB offers? Confused
I 'll go with stripboard as usual...

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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Dec 16, 2010 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).



tommi wrote:
Why am I always late for fonik PCB offers? Confused
I 'll go with stripboard as usual...

sorry. Crying or Very sad

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tommi



Joined: Dec 05, 2007
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PostPosted: Fri Dec 17, 2010 2:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).


Thanks. I'll add these little changes on the stripboard!
It would have been easy adding these changes to the PCB too Crying or Very sad

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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Dec 17, 2010 3:09 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
Quote:
i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).


Thanks. I'll add these little changes on the stripboard!
It would have been easy adding these changes to the PCB too Crying or Very sad

true. however, you actually could do these changes off board at the potentiometers.

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tommi



Joined: Dec 05, 2007
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PostPosted: Fri Dec 17, 2010 3:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
true. however, you actually could do these changes off board at the potentiometers.


Not to be honest, because I choosed to use pcb mounted pots. I choose that way to reduce the number of cables running from the board to the panel mounted components for a cleaner build Very Happy
Anyway I'll put those resistors on the board.
But I planned to mount R3,4,7 and 8 on the jacks and this will make the stripboard less crowded (and less deep).

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tommi



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PostPosted: Mon Dec 27, 2010 3:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I got my stripboard version working now! I posted pictures on the 2010 build thread. After some troubleshooting due to brutal mistakes, such as forgetting one resistance and putting all trannies backwards (!). Watching fonik's pcb i realized that 2n3906's pinout is the opposite of what i decided it was..
I am not sure about how to calibrate this module.
I don't have a scope so i just followed the procedure told by fonik on page 7:
-with no signal applied and all pots down exept for carrier initial wich is fully up, I turn the trim (T1) until i got 0V at TP1.
The same procedure for the modulator signal.
So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident.
I am not sure if my calibration is ok and just wanted to share my experience..
cheers

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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Dec 27, 2010 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident.

all is okay, even the bleedthrough. you cannot expect VCA action from this design anyways...

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tommi



Joined: Dec 05, 2007
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PostPosted: Mon Dec 27, 2010 9:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
you cannot expect VCA action from this design anyways...

That's right! Anyway this module have its own character and me too i was hit by the demo of kkissinger!
Any suggestion about some interesting patch that modulates two DC signals?
cheers

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the_ufo



Joined: Nov 02, 2010
Posts: 15
Location: edinburgh
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PostPosted: Mon Jan 31, 2011 8:27 am    Post subject: what to do Reply with quote  Mark this post and the followings unread

i've soldered over some of the holes and the braid isn't removing the solder... help?
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softfin



Joined: Oct 11, 2006
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Location: Far in the north
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PostPosted: Mon Jan 31, 2011 9:53 am    Post subject: Re: what to do Reply with quote  Mark this post and the followings unread

the_ufo wrote:
i've soldered over some of the holes and the braid isn't removing the solder... help?


Sounds like a situation where a desoldering pump would come in handy. Smile
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the_ufo



Joined: Nov 02, 2010
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PostPosted: Mon Jan 31, 2011 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

thankyou!
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emdot_ambient



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PostPosted: Tue Feb 01, 2011 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yep, desolder pump is your friend. Best purchase I've made for DIY (next to a somewhat decent soldering station). Desolder pumps can be a bit of a pain--you've got to keep them cleaned out--but they're WAY better than desoldering braid. Less potentially damaging as well.
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