TOM WHITSHIRE VCLFO PCB

haxster · Posted: Sat Jun 27, 2009 9:39 pm Post subject:

Some Mac users are not able to see the layout file. I made a 600dpi picture of the silkscreen incase you can't see the small lettering

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Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

thanks haxter

so is there a schematic also?

i've seen the one at tom's site
but would like to see the your pcb version if poss so i can work out how and where to tweak to my needs

haxster · Posted: Sat Jun 27, 2009 10:31 pm Post subject:

Yeah, I have to do that. I will post soon. I just got express PCB schamtic all setup for my needs to make it faster.

a100user · Joined: Oct 28, 2003 Posts: 158 Location: UK

Hi Haxster,

Board and PIC has arrived.

many thanks

David

haxster · Posted: Tue Jun 30, 2009 10:53 am Post subject:

Here's the schematic for the DVCLFO core.

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Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

thanks mate

jojjelito · Joined: Jun 27, 2007 Posts: 50 Location: Stockholm, Sweden

Drats! Missed out on both runs... Any chance of a new one? I would be in for at least 2 boards with PICs if that came to pass.

henrikgo · Joined: Jul 05, 2008 Posts: 40 Location: sweden

I'm about to finish up my LFO but there are a couple of caps that I can't find the value for. The ones marked with red.

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haxster · Posted: Sun Jan 10, 2010 4:28 pm Post subject:

The one at the bottom is 0.1uf, that is for the GLIDE/portamento

The two Cap pairs are for the Analog LFO's. Pair them with values like this: 0.0047uf, 0.01uf. You are free to experient with values. The higher the cap the slower the LFO. For example 2UF NP will make it go really slow.
A good combo is like this: 0.00xx uF, 0.0x uF.

The Last one circled in red is an LED not a cap.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

hey haxster

im designing my panel for this

i noticed your schematic only shows a 6 position rotary switch, isnt there 8 waveforms (7+noise) ?

henrikgo · Joined: Jul 05, 2008 Posts: 40 Location: sweden

sduck · Posted: Sun Mar 21, 2010 5:47 pm Post subject:

I've got a pcb/pic set of this that I'm probably never going to get around to using - it's way down on the bottom of a huge stack of things that want to get built first. So realistically I should let them go to whoever wants them, for the 40$ US that I paid for them. These are from the first run. PM me.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

shame about that
i think this is an awesome design
phase distortion lfo!!
it is a shame it doesnt go into vco ranges

im going to make a mod pcb to get all the options out of the PIC too

haxster · Posted: Thu Mar 25, 2010 5:03 pm Post subject:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

haxster

did you use this schem for the analog lfo?

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i cant seem to get the square / ramp switch working
can you provide a wiring diagram for this for me
it is hard to know what is going on with no real schematic

haxster · Posted: Sat Apr 10, 2010 6:14 pm Post subject:

Yeah I used that circuit, I will open up the file and help you out. I am not home right now, I will do it when I get home.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

that would be great thanks

haxster · Posted: Mon Apr 12, 2010 10:26 am Post subject:

Oh wait I used the Soundlab Plus LFO not the Ultimate. I will have info soon.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

i finally found the schematic for sl-plus lfo
there is no link for it on the mfos site anywhere but luckily the page is still there and i was able to find a link to it on a forum thread

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haxster · Posted: Tue Apr 13, 2010 11:44 pm Post subject:

Did you figure it out yet or do you still have trouble? If I recall on the first run, the Analog LFO has the 1 2 3 labeled wrong I think i mentioned this on the previous page.

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

my pcbs were from 2nd batch

i think i have got it now, yet to test
ive been working on my mods to the digital lfo today but ill test this again now

the problem was i had no idea how those numbers match the switch pins
even now that i have an idea of how to route the wires the numbers dont make sense to me

how can 1 and 4 mean the center pins of the switch?
is this correct?

i usually think that dpdt switches are like this

1 4
2 5
3 6

where as i think you have it like this

2 5
1 4
3 6

haxster · Posted: Wed Apr 14, 2010 1:22 am Post subject:

It's like this:

1 is the center, then 2 is above, then 3 is below (that's one column)

2
1
3

next 4 is the center, then 5 is above, then 6 is below (that's one column)

5
4
6

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

cool thanks

i havent seen those conventions before

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

ok that works

my square is almost rail to rail whereas the tri is 10vpp

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

so has anyone built their lfos?

i have finally got mine completed
the squarewave on the analog lfo was running rail to rail (30vpp)
i used a simple voltage divider (49k9/27k) to get it down to 10vpp

i also implemented vc-sample'n'hold, vc-waveform selection, vc-phase distortion

took a lot of work to get it going but it was worth it
im doing the 2nd one now

here is the panel

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and the mess

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