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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Another version of the simple oscillator AND LFO. :)
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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Sun Aug 17, 2008 10:31 pm    Post subject: Another version of the simple oscillator AND LFO. :) Reply with quote  Mark this post and the followings unread

A friend of mine just sent me this link, thinking I would get a kick out of it. Wink I almost immediately thought that there could be something useful here to some of the Lunetta builders to go with, or start from. Smile (The LFO section, based around the CD40106.)

http://www.hackaday.com/2008/05/01/how-to-make-a-digital-synthesizer/
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jnuaury



Joined: Feb 28, 2008
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PostPosted: Sun Aug 24, 2008 2:00 am    Post subject: Reply with quote  Mark this post and the followings unread

nice link! i have never been able to use ONLY two inverters on those chips... i feel like the chip is only happy if i make use of all six inverters

i love vactrols like everyone else but i wonder why more people dont utilize mosfets like this circuit does - it is cheaper and easier to implement than vactrols and allows you to do audio rate modulation
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richardc64



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PostPosted: Sun Aug 24, 2008 7:27 am    Post subject: Reply with quote  Mark this post and the followings unread

I wonder why nobody has suggested the method used in the WSG -- an npn transistor in parallel with the timing resistor -- or that used in Vanishing Point v2.1 -- an npn in the ground leg of the timing capacitor. (Diodes could also be used, as seen in various paia designs.)

I'm also wondering if both methods could be combined for an up or down frequency sweep.


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synthmonger



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PostPosted: Tue Aug 26, 2008 1:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you test this out? It didn't work for me ;d
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richardc64



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PostPosted: Tue Aug 26, 2008 7:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

synthmonger wrote:
Did you test this out? It didn't work for me ;d


No, and I don't think I can until this weekend.

We can be reasonably certain that both methods work separately. There must be something missing when they're combined: The result is less than the sum of its parts.

I'll get it. This is of interest to me for things other than WSGs and Lunettas.

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richardc64



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PostPosted: Fri Aug 29, 2008 12:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

It works, but seemed a bit flaky -- which may be due to my overuse of alligator clip leads. Items in red are what I used for this quicky breadboarding.

The timing capacitor C5 (0.47µF) needed a "keep alive" resistor in the ground leg, across the bottom transistor C & E. The disproportionate base resistors and relatively large value UP/DN pot are an attempt to correct the disproportionate effect of "up" vs "down." I took no frequency measurements, just used my ears.

CV was the 9V supply voltage.


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