X-4046 VCO Page is Up

fonik · Posted: Mon Nov 07, 2011 3:33 am Post subject:

a short soundsample of my dual X-4046 VCO - thank you, thomas!
(sorry for the bad video quality, but i have been too lazy to install a proper light)

sonic · Joined: Dec 02, 2010 Posts: 106 Location: Victoria BC

Lovely sounds Fonik. Can't wait to get mine up and running.

Tim Servo · Posted: Mon Nov 07, 2011 12:03 pm Post subject: X-4046 VCO Page is Up

Nice work, Mattias!

What sort of tracking range are you getting from the 4046 VCOs?

Tim (should be working, but checking e-m.com) Servo

Paradigm X · Posted: Mon Nov 07, 2011 4:47 pm Post subject:

Sounds amazing!

Im definitely getting one or two of those on the next run.

Does that include the waveshaping things?

Excellent.!

Wobuse · Joined: Dec 07, 2011 Posts: 34 Location: Lyons,il

Hey Spitfire...
Sorry to necro post but I see a problem on the PCB you etched,I know because I just made the same mistake. I think I should of flipped or reversed the artwork for this board,before I made it with Press N Peel.As it is now & just like your board pics I think the Chips are backwards & upside down; meaning you would have to intstall your chip sockets on the copper side of the PCB in order for the pinouts to work.Keep in mind that the square pad is pin one on the IC . Anyone else care to comment.

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

@Rykhaard
Is the 'error' on the PCB layout already fixed?? (10k res. in Sinesection @ TL074)

I would love to build one of those ...

EDIT: I'm a newbee to electronic-circuits, so don't beat me please .... but if I understand the sheets and the comments right, then the little error on the pcb-layout by rykhaard is this one see attachment??
(borrowed the layout from drapdap on page 3)

x4046-rework.png

Description:

rework of pcb-layout regarding 10k res. in Sinesection @ TL074

Filesize:

158.02 KB

Viewed:

981 Time(s)

This image has been reduced to fit the page. Click on it to enlarge.

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

a second newbee question on the original schematics ....

between leg2, leg 3 and leg 14 of the IC1 (4046) there is a XOR-GATE, is this something internal of the IC or do I miss a part ???
the PCB-Layout yust makes a bridge between legs 2 and 5, leg 14 goes to +15 and leg 3 goes to Q3 / R14 .....

slacker · Posted: Thu Jan 12, 2012 11:33 am Post subject:

Yes, the XOR gate is part of the CD4046. Pins 14 and 3 are the inputs and 2 is the output.

01012k7 · Joined: Aug 31, 2013 Posts: 25 Location: England

Antichambre · Joined: Oct 14, 2013 Posts: 2 Location: France

Hi everyone,
My x-4046 is built and works perfectly.
I drive it in pitch with a 12bit DAC, no problem for this part, now i need to digitally control the rampoid skew, i can't use a DCP for that, cause this last accepts only positive signal less than 5v.
Who can help me?
TIA...

elmegil · Posted: Mon Oct 14, 2013 7:42 pm Post subject:

Crazy idea, probably too expensive, but I think it could work with the right parts.

Back to back vactrols. Have a DAC driving the first, and that same voltage going through an inverter to the second, so when one is bright the other is dark and vice versa.

Issues that need to be checked out: appropriate resistance values (500k sum?), trimming so that they are roughly equal, response curve of the vactrols (roughly linear? is non-linear a problem?), does the light memory/slow response of the vactrols cause you any concerns?

01012k7 · Joined: Aug 31, 2013 Posts: 25 Location: England

ok I made a second board as I think the first one I made was wrong I think A is right in the picture

20131015_234612.jpg

Description:

Filesize:

1.57 MB

Viewed:

1765 Time(s)

This image has been reduced to fit the page. Click on it to enlarge.

airfrankenstein · Joined: Jan 10, 2010 Posts: 62 Location: france

Hi,

Can someone verify my edit of the layout to see if it is correct?
I tried to take into account various revisions pointed out in the thread.

thomas_henry_4046_vco_122_pnp_114.pdf

Description:

Download (listen)

Filename:

thomas_henry_4046_vco_122_pnp_114.pdf

Filesize:

1.99 MB

Downloaded:

1890 Time(s)

thomas_henry_4046_vco_122_pnp_114.pdf

Description:

Download (listen)

Filename:

thomas_henry_4046_vco_122_pnp_114.pdf

Filesize:

1.99 MB

Downloaded:

1847 Time(s)

mrmrshoes · Posted: Tue Feb 11, 2014 3:35 am Post subject:

I've just built and tested my own pcb layout of this circuit and it works fine. I can give you the eagle files if you like.

They are a fair few jumpers, but that don't bother me like Wink

4046-vco.png

Description:

Filesize:

43.7 KB

Viewed:

1923 Time(s)

This image has been reduced to fit the page. Click on it to enlarge.

airfrankenstein · Joined: Jan 10, 2010 Posts: 62 Location: france

great, looks nice!
Can you pm me the eagle files then?
no problem bout the jumpers.

btw any thought s about this one in relation to the 555 vcl by TH?
Hard to find opinions.

mrmrshoes · Posted: Tue Feb 11, 2014 6:43 am Post subject:

No probs like

I've sent you a pm

airfrankenstein · Joined: Jan 10, 2010 Posts: 62 Location: france

thanks!

01012k7 · Joined: Aug 31, 2013 Posts: 25 Location: England

airfrankenstein · Joined: Jan 10, 2010 Posts: 62 Location: france

I'm having a hard time finding demo clips of the 4046. Fonik has one or two and that's about it. What existing vco would it be comparable to?

mrmrshoes · Posted: Fri Feb 14, 2014 6:47 pm Post subject:

01012k7 - check you pm like.

Designator · Joined: Jul 18, 2012 Posts: 9 Location: Northern Hemisphere

I'm interested in the Eagle files, too...

inlifeindeath · Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM

fonik · Posted: Thu Mar 06, 2014 1:00 am Post subject:

mrmrshoes · Posted: Thu Mar 06, 2014 10:41 am Post subject:

I'll post the eagle files later on the night when i get home, so if anyone else is interested they can just jump in.
If any one has a problem with me uploading these files please just let me know and i'll take them down.

i've got an 555 VCO layout thats tried and tested by a fair few people. I'll post this in its own thread if they's any takers?

mrmrshoes · Posted: Thu Mar 06, 2014 7:37 pm Post subject:

You'll need to compare TH schematics to mine for pot names, values, the odd jumper and a wee bit of off board wiring. Should be pretty easy to figure out.

A quick overview

All red traces on the board are jumper wires.

The one air wire from the expo transistors to the LF442 is also a jumper wire. (solder pads have been provided)

All off board wiring use 2 or 3 pin 0.1 header connectors (I really recommend these)
http://www.esr.co.uk/electronics/products/frame_connectors_pcb.htm

I would use eagle when building. you can highlight a part/trace in the schematic editor (show object button) and it will show up in the board editor. (really useful, i use it all the time)

two VCO's can be transferred onto on 160mm x 100m copper clad board

the freeware version of eagle allows you to export images from these files. The board dimensions are bigger than the the freeware limitations so you won't be able to edit without the full version.

This is how you prepare the artwork for Press n Peel

http://gaussmarkov.net/wordpress/tools/software/eagle/creating-a-pcb-image-using-export/
http://www.cnczone.com/forums/general_electronics_discussion/33374-eagle_pcb_image_toner_transfer_lil_tutorial.html

These file are for personal use only.

feel free to tweek and mod, if you make them better please post them here.

anyway have fun and happy building.

Also if anyone has a problem with me posting these files please just let me know.