LM567/LM567C Tone Decoder

[Hatredman]

http://www.ti.com.cn/cn/lit/ds/symlink/lm567.pdf

I can think of some applications for this, but what do you all think?

[digi2t]

Logan 5 pseudo ring modulator.

Also used in the Snarling Dogs Mold Spore Wah.

[Hatredman]

Logan 5 pseudo ring modulator.

Also used in the Snarling Dogs Mold Spore Wah.

Hummm, didn't know these.
These are all ring mod stuff, which is a clever way to use this little guy.

I was wondering if someone has used them "by the book" as a "tone comparator" - they just switch on when the input signal is within a programmed frequency band.

For example, you could use 2 of them to trigger different stuff for the higher and lower notes - silly one, turn on an octave up when notes are above a certain pitch, and an octave down when notes are below some other limit.

[bluesdevil]

Escobedo's simple Thing Modulator comes to mind.

[blackieNYC]

Love the thing modulator, as-is.  A pedal that not only sounds badass but makes you want to play slower, as several do, and let the note do its thing.
I recommend a way to stop the ticking when the thing is off.  Use the stompswitch contact that brings ground to your LED to turn it on, and have it ground pin 6 when the thing is off. Shut off the oscillator. I don't believe mine draws any current when 6 is grounded.  Used it a lot.  There is of course a little oscillator bleed when it's on but - only when you are not playing.  Every guitar player knows how to avoid that.

[GibsonGM]

Logan 5 pseudo ring modulator.

Also used in the Snarling Dogs Mold Spore Wah.

Hummm, didn't know these.
These are all ring mod stuff, which is a clever way to use this little guy.

I was wondering if someone has used them "by the book" as a "tone comparator" - they just switch on when the input signal is within a programmed frequency band.

For example, you could use 2 of them to trigger different stuff for the higher and lower notes - silly one, turn on an octave up when notes are above a certain pitch, and an octave down when notes are below some other limit.

I've messed with them that way.  Don't know if there's a way to improve it, but the bandwidth for whatever freq. you select seems to be pretty wide - so that the chip can't really tell 400Hz from 500Hz, for example, within some tolerance (dunno what that is offhand).  So it would be an unreliable 'trigger' for guitar notes, i think.  It CAN act that way for a range of notes, tho.   That width makes it neat for triggering 'events', tho - think of triggering a flashing light on halloween in response to a tone above human hearing in a recording that's playing - 24kHz etc.  You don't have to be exact in the tone you generate! 

I bought a ton of these years ago and haven't used them much, but have wanted to do something fun with them that isn't a ring mod, lol.   I'm going to see what this thread generates for ideas....

[knutolai]

Its used for the pseudo-ringmod in the Dwardcraft Devices Hax.

[anotherjim]

Limitation with that chip is the "VCO" has no CV system. It would better be called the local oscillator, hence it's typically used for ring mod.



But, hmmm,
If a vactrol LDR was used for the VCO timing R, and the LED driven from the loop filter, you might get some wibbly-wobbly pitch following action?

[~arph]

Here's a better datasheet:

http://www.instructables.com/files/orig/FAL/O7SL/HKVLM3K7/FALO7SLHKVLM3K7.pdf