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 Forum index » DIY Hardware and Software
The LFX experimental LFO (8K LFO and Weird Waveshapers)
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Tim Servo



Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11

PostPosted: Thu Sep 26, 2013 10:19 am    Post subject: The LFX experimental LFO (8K LFO and Weird Waveshapers) Reply with quote  Mark this post and the followings unread

Hey Isak,

Yes, that Rev 02 schematic is the latest and greatest (the only change I've made so far is to update the value of R5).

Happy building!

Tim (born with a soldering iron in my hand... my Mom never let me forget that) Servo
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isak



Joined: Dec 13, 2009
Posts: 703
Location: Israel
Audio files: 18

PostPosted: Thu Sep 26, 2013 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
(the only change I've made so far is to update the value of R5)

are you sure?
asking cause looking at your old 8k LFO scheme i see that C1 changed from 3300pF to 0.01uF.
and few resistors have changed as well.
i'm talking about this scheme..

Posted Image, might have been reduced in size. Click Image to view fullscreen.

i also want to add your cool sync scheme that i got from my other post.

is this the right way to do it?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

one last thing...
can i output gate from the 8k LFO to gate say...ENV and to be able to control the gate speed with the rate pot?
if yes, please tell me from where?

thanks again Tim.

Quote:
Tim (born with a soldering iron in my hand... my Mom never let me forget that) Servo

you killed me with that one Laughing

EDIT:

if i got you correctly the VER2 is a summing of the next 3 schemes, right?
the waveshapes i saw in your Tube clip was amazing!!
i want them so much Smile

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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Tim Servo



Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11

PostPosted: Thu Sep 26, 2013 4:26 pm    Post subject: The LFX experimental LFO (8K LFO and Weird Waveshapers) Reply with quote  Mark this post and the followings unread

Yeah, I may be a little confused on the changes, but the Rev 02 is definitely the latest one. And yes, the LFX is a hybrid of the TSQ and 2x TSW waveshapers. I highly recommend adding an LED monitor (with transistor or op-amp buffer) to get some idea of what the output is doing. Smile Also, you have the sync circuit hooked up correctly. Looks like you've got some fun building ahead of you!

Tim (building an LFO is a lovely way to spend a weekend) Servo
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isak



Joined: Dec 13, 2009
Posts: 703
Location: Israel
Audio files: 18

PostPosted: Fri Sep 27, 2013 12:21 am    Post subject: Reply with quote  Mark this post and the followings unread

I will want to add a led indicator, I will come home later on and post the led scheme I have.

About the gate out to trigger ENV etc...is it possible to have?

cheers Smile

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isak



Joined: Dec 13, 2009
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PostPosted: Sat Sep 28, 2013 3:23 am    Post subject: Reply with quote  Mark this post and the followings unread

this is the led scheme i have from you..
i guess i need to put it at the output, the "problem" is there is not only one output, maybe use a 4pos rotary switch and from there to the led scheme?


basic_led_driver_131.jpg
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basic_led_driver_131.jpg



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flab



Joined: Feb 13, 2012
Posts: 60
Location: Glasgow

PostPosted: Sat Oct 12, 2013 4:56 am    Post subject: Reply with quote  Mark this post and the followings unread

well, i think im really interesting to this as a vclfo ,with the sync part , same think you are looking for Isak , how are you going to apply a rate pot to it thought ?
cheers
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isak



Joined: Dec 13, 2009
Posts: 703
Location: Israel
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PostPosted: Sat Oct 12, 2013 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, I did few mods to the attached layout here with illustrator.
Didn't build this yet, the rate is like the original I guess Or maybe remove the fine tune? Don't know yet.
I changed the timing cap to 2 timing caps, dont remember the values, I think the values are 0.1uF and 0.001uF with a switch for high and low speed.
I'll upload the scheme and the modified board as soon as I can, not at home at the moment.
The mods are the add on led and 2 timing caps.

Cheers.

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flab



Joined: Feb 13, 2012
Posts: 60
Location: Glasgow

PostPosted: Wed Oct 16, 2013 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I built that yesterday , beautiful
thank you Tim

cheers
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isak



Joined: Dec 13, 2009
Posts: 703
Location: Israel
Audio files: 18

PostPosted: Wed Oct 16, 2013 10:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi flab.

Happy to hear you got this thing working Smile
What did you eventually did with the fine tune/tune?
Did you used one of the layouts that attached to this post or directly from the scheme?

Cheers Smile

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flab



Joined: Feb 13, 2012
Posts: 60
Location: Glasgow

PostPosted: Wed Oct 16, 2013 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

hiya,

well i kept both of them fine tune / tune ,
i added the sunc , a switch at R36
added three led indicators
also i think to place an 1M pot at the R1 so i can play with the tri offset ,
if am not mistaken, as long as is at my breadboard ,
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flab



Joined: Feb 13, 2012
Posts: 60
Location: Glasgow

PostPosted: Thu Oct 17, 2013 3:34 am    Post subject: Reply with quote  Mark this post and the followings unread

well what i said about R1 yesterday is all lies ,obviously is not working ,im sorry R1
also there is a think with the sync , can i change the 1n 914 diode with sth else ? like a equivalent one ? i think thats the think about my sync
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feggster



Joined: Sep 12, 2011
Posts: 52
Location: uk

PostPosted: Sat Aug 23, 2014 5:51 am    Post subject: Reply with quote  Mark this post and the followings unread

hi there, just got round to trying a layout on stripboard for the sync, wondering if anyone cares to check it,
note: the 6.8k would go to a switch/jumper for v+ or v-

also as was asked, can the diode be subbed (1n4148?)
thanks.


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