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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Perfboard layout for 40106 w/ triangle and square output
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commathe



Joined: Jul 26, 2013
Posts: 90
Location: Beijing
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PostPosted: Tue Aug 20, 2013 6:57 pm    Post subject: Perfboard layout for 40106 w/ triangle and square output Reply with quote  Mark this post and the followings unread

It's now time for me to give back to the community. This is an amalgamation of two separate designs I learnt from online. The oscillator is from the Caspar Electronics Drone Lab Mk. 2, while the triangle wave out and subsequent preamp for it came from the dlbelectronics.com site.

Although working out how to lay out and make something is half the fun, it can sometimes be nice to solder by numbers. Hope this little post of mine can help out those of you out there who are lurking and trying to get started.

EDIT: Needs revision. Will hopefully be able to update this within a week or two.


perfboardlayout.png
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Perfboard layout
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perfboardlayout.png



40106 osc.bmp
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Schematic

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Last edited by commathe on Sun Aug 25, 2013 6:34 pm; edited 1 time in total
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Cynosure
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Joined: Dec 11, 2010
Posts: 717
Location: Toronto, Ontario - Canada
Audio files: 42

PostPosted: Tue Aug 20, 2013 8:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. Do you have a link to more info on the triangle converter? It just looks like a linear inverter to me. I don't understand how it makes a triangle.
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commathe



Joined: Jul 26, 2013
Posts: 90
Location: Beijing
Audio files: 5

PostPosted: Sun Aug 25, 2013 5:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

This needs some revision. I was running it into my sound card last night and the pre amp stage needs some tweaking. I'm going to do some more bread boarding then do another build.

Issues that need to be looked at:
- The input pins and not the output pins on the 40106 should be hooked up to the inverter pre-amp. The timing cap charging and discharging is what creates the triangle wave
- Using a bigger cap will yield a smoother pseudo triangle wave. Need to mess around with increasing that and decreasing pot sizes.
- 2M resistor on the feedback loop for the inverter pre-amp is a little off. Way too much amplification. Trim pots in there will be best.
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acidblue



Joined: Jun 26, 2009
Posts: 192
Location: The Darkside

PostPosted: Sat Feb 01, 2014 5:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you ever work out the problems on this?
It seems promising.
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commathe



Joined: Jul 26, 2013
Posts: 90
Location: Beijing
Audio files: 5

PostPosted: Sat Feb 01, 2014 5:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

I did actually! I will need to dig it up though. It's currently on my work computer, where I wont be for another week. I'll try to get it uploaded after I go back. Part of the revisions I made were because I got my hands on a bunch of much larger film caps too.
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DUBmatze



Joined: Feb 18, 2013
Posts: 122
Location: south Germaica (schwabilon)

PostPosted: Sun Feb 02, 2014 3:55 am    Post subject: Reply with quote  Mark this post and the followings unread

good morning,

that 4049 and stuff looks a bit like the parts i have on my breadbord at the moment. (from testing distortions ... )

so i breadboarded the 100k -> 1u -> 20k (22k) -> inverter with R 2M parallel -> 1u. I got Square wave out (running it on 5V).

i got some Tri-waves with a config like: 1u -> 22k -> inverter with 47n parallel -> 1u. (this work more like a filter -> cuts the high freq out)

but i will test this later .... now i need to drive the kids to grandma...
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commathe



Joined: Jul 26, 2013
Posts: 90
Location: Beijing
Audio files: 5

PostPosted: Sun Feb 02, 2014 8:37 am    Post subject: Reply with quote  Mark this post and the followings unread

That's one of the biggest errors in the layout! The fake triangle wave comes from where the purple connections are on that layout NOT from the dark blue! The other errors are all in the values. I remember that I bumped up the cap values to get a better triangle wave output. It's still not perfect though, it gets a bit mishapen at higher frequencies.

If you guys can hang on till the 10th I can get my better updated version uploaded!
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Collman



Joined: Jun 30, 2013
Posts: 8
Location: Buenos Aires
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PostPosted: Thu Aug 21, 2014 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Any chance you can share the updated layout?
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commathe



Joined: Jul 26, 2013
Posts: 90
Location: Beijing
Audio files: 5

PostPosted: Thu Aug 21, 2014 8:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Unfortunately I never got round to building it this way so I don't have a layout for it. Embarassed
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Collman



Joined: Jun 30, 2013
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PostPosted: Thu Aug 21, 2014 9:31 am    Post subject: Reply with quote  Mark this post and the followings unread

That's ok, I'll try my hand at it and report back if I actually get somewhere.
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okelk



Joined: May 08, 2014
Posts: 29
Location: Vienna

PostPosted: Sat Aug 23, 2014 2:33 am    Post subject: Reply with quote  Mark this post and the followings unread

There is a schematic for pretty much the same thing here:

http://dlbelectronics.com/lunetta
Posted Image, might have been reduced in size. Click Image to view fullscreen.

It would be great if anybody could explain to me why there is a need for the 1u decoupling caps!
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Collman



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PostPosted: Sat Aug 23, 2014 5:34 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm working from that schematic too and had the same question. I presume that one of the caps attached at the switch should be a different value, right?

I've also been wondering what the bypass caps (C19 and C20) do in the circuit posted by Commathe since they aren't there in the dlb schematic, unless I'm missing something of course.
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Collman



Joined: Jun 30, 2013
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PostPosted: Sat Aug 23, 2014 5:35 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm working from that schematic too and had the same question. I presume that one of the caps attached at the switch should be a different value, what would be a good value there?

I've also been wondering what the bypass caps (C19 and C20) do in the circuit posted by Commathe since they aren't there in the dlb schematic, unless I'm missing something of course.
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okelk



Joined: May 08, 2014
Posts: 29
Location: Vienna

PostPosted: Sat Aug 23, 2014 8:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I would jut put it on a breadboard and try it with and without the coupling caps, but I don't have a 4069 or 4049 at hand at the moment...
As far as I understand it coupling caps are usually used to cancel out dc voltages, but I don't get why there should be any dc bias in the first place...And even if there is any why do you need 2 of them?

Collman wrote:
I'm working from that schematic too and had the same question. I presume that one of the caps attached at the switch should be a different value, what would be a good value there?


I think the 100n and 1u capacitors at the switch for selecting the frequency range are fine, but could of course be adjusted to taste ( like the 22n cap in the
schematic commathe posted.)
btw...its also possible to to switch the bigger cap in parallel to the smaller one instead of between them.

Collman wrote:

I've also been wondering what the bypass caps (C19 and C20) do in the circuit posted by Commathe since they aren't there in the dlb schematic, unless I'm missing something of course.


The circuit probably also works without them, but it is good practice to use bypass caps to cancel out power supply noise and power fluctuatons.
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commathe



Joined: Jul 26, 2013
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Location: Beijing
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PostPosted: Sat Aug 23, 2014 9:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

C19 and C20 are decoupling caps. They act as mini-batteries for the chips. They are actually for helping reject AC on the power line so that the chips get a nice constant DC 9V.

Also, this is based directly off the dlb schematic but I changed the 2M resistors to trim-pots so I could tweak the gain myself and get a nicer triangle and I changed cap values, also for smoother, more "true" triangles waves.

Ended up never building it though.
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