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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
4046 Pitch Tracker - Turn clicks into lasers
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Draal



Joined: May 18, 2010
Posts: 304
Location: Oak Park, IL
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PostPosted: Tue Apr 02, 2013 12:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dogenigt wrote:


I am integrating the 4046 module into a larger lunetta synth - so only square waves will come in, do you think the 4049/4069 will add something to the sound even though the signal is squared in the first place anyways?

of course I could just test this out myself, I might anyhow but I don't see how you could "square up" a signal which is already squared... Very Happy


I've built my first tracker just like it is in the Nic Collins book; with the 4049 as preamp. Realistically, it's not essential in our lunetta since most of the stuff we will push through the 4046 will already be square/square-ish. My more recent tracker builds don't use the 4049 and work just as well as my first one.

That said, I have heard slight variation in sound when I sweep the 4049 gain pot. Adds a bit of hair to the sound but not a must build Wink .

With the 4049 and say a 1/4 jack wired to accept input from a guitar, mic, etc., the addition of non square signals can be accomplished. (I need to diagram that sentence).

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Dogenigt



Joined: Oct 25, 2009
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Location: Denmark
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PostPosted: Tue Apr 02, 2013 5:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

[quote="Draal"]
Dogenigt wrote:


With the 4049 and say a 1/4 jack wired to accept input from a guitar, mic, etc., the addition of non square signals can be accomplished. (I need to diagram that sentence).


Yeah, I've got my own copy of Handmade Electronic Music Wink
It's a brilliant idea though and included in my future build no doubt!

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Dogenigt



Joined: Oct 25, 2009
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PostPosted: Tue May 21, 2013 10:56 am    Post subject: Reply with quote  Mark this post and the followings unread

I am having a little headache about something here.

I want to have diodes on my 40106 pulse outputs for mixing but when I connect this output through the diode to the input of the 4046 it doesn't work. It's like there's no input.

I could mix with resistors but then the voltage drops from my reference HIGH doesn't it? (9V in my case)

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PostPosted: Tue May 21, 2013 11:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Try a 100K resistor to GROUND after the diode. See if that works.
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Draal



Joined: May 18, 2010
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PostPosted: Wed May 22, 2013 6:33 am    Post subject: Reply with quote  Mark this post and the followings unread

I have mixed signals with a resistor ladder or r/2r and ran them through the pitch tracker without issues (all I care is that I get something at a reasonable volume level ultimately) Smile .

I don't think I've used diodes to mix my signals into the tracker in the past so I'm also curious about this. I did have a 3 input Nand array made of diodes and a transistor. I plugged in 3 oscillators and ran the output of the diode Nand "module" into the pitch tracker and got output. Just another idea to try Smile . Of course, I expect a simpler solution from one of the luantics here Wink .

I got the idea from http://www.play-hookey.com/digital_electronics/dtl_gates.html when I was short of CMOS NAND chips.

This schematic specifically:


Screen Shot 2013-05-22 at 8.19.42 AM.png
 Description:
Maybe worth a try. Helps prevent a bit of bleed-through.
 Filesize:  9.49 KB
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Screen Shot 2013-05-22 at 8.19.42 AM.png



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Dogenigt



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PostPosted: Wed May 22, 2013 2:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys! I solved this buy running the "dioded" signal through a schmitt trigger (40106) Smile
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