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 Forum index » DIY Hardware and Software » Thomas Henry designs
A New Voltage Controlled Quadrature Function Generator
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Danno Gee Ray



Joined: Sep 25, 2005
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PostPosted: Sun Oct 28, 2007 7:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the heads up.

I hope all is well for him, and that he has a speedy recovery.
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bugbrand



Joined: Nov 27, 2005
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PostPosted: Mon Oct 29, 2007 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Slices at the end of the week!
*************************

I have been working again on this and I am so damn sorry for not having produced anything earlier. See, the 1st design I did felt really messy - I wanted to tidy that up, but it hasn't been at all easy using single-sided boards and with keeping things compact. (It still ain't great, either!)

I had a duh moment yesterday.. A month or two ago I'd actually got around to re-doing the layout but then I'd somehow completely forgotten about it - it just needed to be wrapped up. So thats what I'm doing now.

I know its risky to say 'any day now' at the moment, but.......

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Danno Gee Ray



Joined: Sep 25, 2005
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PostPosted: Mon Oct 29, 2007 7:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Glad to hear you're doing well. Thanks for picking this back up, I appreciate your willingness to work on this. I think I'm the one who fell through the cracks on the other option, and just want to be able to build this circuit.

Thanks again
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Thomas Henry



Joined: Mar 25, 2007
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Location: Southern Minnesota
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PostPosted: Mon Oct 29, 2007 5:52 pm    Post subject: Re: A New Voltage Controlled Quadrature Function Generator
Subject description: PCB vs. PCB??
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bugbrand wrote:

First off - well, I'd been keen to do this for personal use but also to offer a pcb plan. Now that Randaleem has moved so quick and is going to be doing pro-boards, I dunno whether I should submit my version pcb (for etching - single sided - so DIYable at home..). What do people (Randaleem, Scott, Thomas) think?

and

Randaleem wrote:
As for you putting up your pcb layout; I think you should!

No worries, mate! Very Happy


Well Bugbrand, there's your answer. I'm sure the rest of the ferric chloride crowd will appreciate your generosity. I know that in my dotage now, I'm sick to the gills of laying boards out! (I'm working on a particularly vexing one right now, and swearing under my breath that I'll never do another PCB as long as I live.)

Anyway, I'll be interested to see what you've come up with.

Thomas Henry
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bugbrand



Joined: Nov 27, 2005
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PostPosted: Tue Oct 30, 2007 4:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Heya,

Yes, this was too much of a battle and, again, I'm really sorry to have taken a freaking age to do this. But now we're (finally) ready:::::

http://bugbrand.co.uk/pages/PDFs/TH_QFG_BugPCB.pdf

- PDF with toner-transfer image ready to go
- parts layout
- redrawn schem just for clarity.
- though refer to Scott's original QFG page for all the decent info!

A few things to note:
1) I haven't actually tested this yet! Well, not this exact version - the layout has changed just a bit from the one I built so I have complete faith that this'll work straight off. In fact, I may well have to build me another one soon 'cos I love it!
2) There's an extra timing cap pad so you can have two ranges. My current setup has one at audio osc speed but there's an upper limit to the audio range defined by, I think, caps C3 and C4. Still you can get up to nearly 1kHz without problem - or go much much much slower with big caps!
3) Note that I've used BC547/557 for the transistors - simply rotate 180deg for 2N3904/6
4) The layout is for my standard of 16mm Alpha pots spaced by 0.8" (roughly 2cm apart). You could easily edit this to something else if you don't like PCB mounted pots.
5) sorry there are so many jumpers.....


Enjoy!

And, for those who've already expressed interest in Randal's PCBs - please wait for a bit longer for the situation on that to resolve rather than jumping ship and going the ferric chloride route.!.

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Etaoin



Joined: Jun 30, 2005
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PostPosted: Tue Oct 30, 2007 4:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Great stuff bugbrand. Thanks!
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Danno Gee Ray



Joined: Sep 25, 2005
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PostPosted: Tue Oct 30, 2007 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Bugbrand,

I have been in contact with Randaleem and will be able to order a PCB. I am grateful to you for doing this though for the community at large.

Well done.
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Tue Oct 30, 2007 1:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Finished mine


thqgbugbrand.jpg
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TH Quadrature Generator
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thqgbugbrand.jpg



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Etaoin



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PostPosted: Tue Oct 30, 2007 1:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

Still need to debug though, as all waves are clipped at +2V. Below are the 180 and 270 outputs:


thqg_scope.jpg
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Clipped Waves
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thqg_scope.jpg



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Etaoin



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PostPosted: Tue Oct 30, 2007 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

By the way, bugbrand, the R36 next IC2 should be R26.
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krisp14u



Joined: Nov 11, 2006
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PostPosted: Tue Oct 30, 2007 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Etaoin wrote:
Finished mine


well done Etaoin that's super fast

I thought I was doing well having etched, tined and drilled my pcb

Hope to get it built and working tomorrow Very Happy

Paul D

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The Alison Project



Joined: Jul 21, 2006
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PostPosted: Tue Oct 30, 2007 7:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks bug, got the parts and I am ready to go.

-
Chris
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Wed Oct 31, 2007 12:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:

I thought I was doing well having etched, tined and drilled my pcb


Ah, you lost time there. I don't tin, I spray a PCB coating.

Quote:

Hope to get it built and working tomorrow Very Happy


You might still get it working before mine Wink

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bugbrand



Joined: Nov 27, 2005
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PostPosted: Wed Oct 31, 2007 4:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow - amazing!
Nice & superquick work!

Etaoin - do let us know how the debugging goes - I'm very keen to make sure that this layout is indeed correct (as I mentioned, this layout is a little different from the one I used originally) - I doubt I'll have time to whack one out myself before my op.
And thanks for noticing the wrong R label -- I'll update the pdf once I've got a moment.


And I'd forgotten that I was also going to recommend a bicolour LED driver add-on too... Like what I did for the Mankato - BiColour leds are mesmerizing to watch! This is the super-simple circuit I employed for that::::


bicolourLEDdrive.jpg
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Simple driver for Bicolour LEDs
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Etaoin



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PostPosted: Wed Oct 31, 2007 4:15 am    Post subject: Reply with quote  Mark this post and the followings unread

No need to debug, it was just me being silly. Because it was easier, I hooked up the scope input to the legs of the LED. The clipping is just the LED conducting. The real outputs are all fine.

So I can now report a confirmed build. The PCB is fine.

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bugbrand



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PostPosted: Wed Oct 31, 2007 4:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Great! & well done for such a fast turnaround!

Does everything fit ok? I notice things look quite tight around the supply input beads / offset trim - - - - is a bit more space needed there, perhaps?

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Etaoin



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PostPosted: Wed Oct 31, 2007 4:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, that is very tight. Caps didn't fit in between the beads (they stick out on top) and C13 and R39 bump into IC3. I guess you intended smaller trimmers anyway (Bourns 3266W?) as the ones I used didn't really fit anyway.
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shawn



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PostPosted: Thu Dec 06, 2007 9:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Bug,

I built 2 but only had time to test one. Works perfectly. Thanks for putting the effort in providing pcb artwork! I did notice that R36 is still twice in the pdf.
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janvanvolt



Joined: Nov 24, 2005
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PostPosted: Fri Dec 07, 2007 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Bugbrand: hich bicolor LED's do you use ? most of the ones here available do have 3 legs and not 2 Sad
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6079smith



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PostPosted: Fri Dec 07, 2007 2:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

unit-sound wrote:
Bugbrand: hich bicolor LED's do you use ? most of the ones here available do have 3 legs and not 2


If you scroll down a bit on this page, Conrad in Germany has 5mm bicolour for 25 cents a pop...

Edited to fix link:
<Edited>
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janvanvolt



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PostPosted: Fri Dec 07, 2007 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Link does not work Sad But i looked for "bicolor led" and found the right ones. thanks for pointing out Smile
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bugbrand



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PostPosted: Sat Dec 08, 2007 5:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool - good you found' em. I get them in the UK from Rapid
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6079smith



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PostPosted: Sat Dec 08, 2007 11:11 am    Post subject: Reply with quote  Mark this post and the followings unread

unit-sound wrote:
Link does not work


Doh! Stupid Internet! Glad you found them, though. Bicolour LED's are lots of fun if, like me, you're easily impressed by pretty blinking lights. Mounting them into a jack plug (and plugging into an audio or CV output gives an instant lightshow...

Back to the Function Generator... is there a way of calibrating this without an oscilloscope? I'd like to build one (thanks for the layout, Bugs), but is it worthwhile if I've no scope? Reading the literature seems to make it essential...
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shawn



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PostPosted: Sun Dec 09, 2007 4:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

I used a software oscilloscope and used it in the audio range (with the mod that is explained regarding C12 and did it that way. The one thing you will need to do in order to use this method is attach a 1M pot so you can lower the volume of the signal otherwise it will chop off the tops/bottoms of the waveform.
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Thomas Henry



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PostPosted: Sun Dec 09, 2007 4:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

6079smith wrote:

Back to the Function Generator... is there a way of calibrating this without an oscilloscope? I'd like to build one (thanks for the layout, Bugs), but is it worthwhile if I've no scope? Reading the literature seems to make it essential...


How about using your ears? Simply route a derived triangle at about 4 cycles per minute from the QFG to the exponential input of a VCO set for about 100Hz or so. Then listen for the blip and null it out. The QFG and VCO frequencies aren't important---just use whatever you can easily listen to.

Thomas Henry
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