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dr_benway
Joined: Dec 26, 2008 Posts: 2 Location: Udine Italy
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Posted: Tue Jun 21, 2022 1:13 pm Post subject:
566 LFO design Subject description: I ask suggestion about a low frequency oscillator design based on NE566 |
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Hi All,
I looking for a simple LFO schematic for my DIY modular synth project.
I have found a working NE566 and it seems like a good candidate.
https://img.ozdisan.com/ETicaret_Dosya/485105_9303808.PDF
The power supply of my modular is dual rail -15 0 15 volt
So I have found this:
https://www.schmitzbits.de/vco566.html
This design is very promising. The exponential converter is not necessary so I think that the PNP and NPN can be omitted in my design.
I just want to generate the square and triangle waveform with a variable frequency range. (e.g. very slow/normal/audio range).
Have you any suggestion about the necessary modifications?
Thanks,
B.R.
Giorgio. |
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Sun Jun 26, 2022 8:47 pm Post subject:
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There's probably some discussion around here in the Thomas Henry subforum about this as well. |
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Sven
Joined: Mar 10, 2017 Posts: 48 Location: Norway
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Posted: Mon Jun 27, 2022 11:45 pm Post subject:
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Everything is described in the datasheet on page 4. You can use Figure1 on page 5. The formula for the output frequency is given. I would try a 10K potentiometer for R1 and start with 1µF for C1. The datasheet also has a diagrams for the output frequency as function of C1(with R1 at 4kOhm) and as function of R1(unfortunately without a given value for C1). |
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Sven
Joined: Mar 10, 2017 Posts: 48 Location: Norway
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Posted: Mon Jun 27, 2022 11:55 pm Post subject:
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Everything is described in the datasheet on page 4. You can use Figure1 on page 5. The formula for the output frequency is given. I would try a 10K potentiometer for R1 and start with 1µF for C1. The datasheet also has a diagrams for the output frequency as function of C1(with R1 at 4kOhm) and as function of R1(unfortunately without a given value for C1).
Here is more explanation of the circuit which I find very helpful https://sound-au.com/project162.htm
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Post was edited because I wasn't reading carefully, question about why the TO wants to use the NE566 removed. |
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