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gasboss775
Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Sat Mar 04, 2017 5:27 pm Post subject:
Anyone Know Of Any Good Uses For The LM567? |
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I've got a bunch ( 20+ ) of these LM567 tone decoder chips, does anyone know of any musical applications for these parts? |
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JovianPyx
Joined: Nov 20, 2007 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
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Posted: Sat Mar 04, 2017 9:18 pm Post subject:
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I can't think of any musical application off the top of my head, but if you haven't done so yet, I'd suggest getting the data sheets and just dream/think about them. Read them more than once. They are meant for a variety of frequency to logic applications like touch tone decoders and FSK decode stuff. The chip appears to have a VCO inside it, so maybe there's some way you can force it to do something with the VCO and get a musical tone out of it.
Bottom line: The only way you can learn about it is to read and understand the datasheet. _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
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gasboss775
Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Sun Mar 05, 2017 12:21 pm Post subject:
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JovianPyx wrote: | I can't think of any musical application off the top of my head, but if you haven't done so yet, I'd suggest getting the data sheets and just dream/think about them. Read them more than once. They are meant for a variety of frequency to logic applications like touch tone decoders and FSK decode stuff. The chip appears to have a VCO inside it, so maybe there's some way you can force it to do something with the VCO and get a musical tone out of it.
Bottom line: The only way you can learn about it is to read and understand the datasheet. |
Thanks. If I can come up with anything interesting will be sure to post it here. |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Sun Mar 05, 2017 3:29 pm Post subject:
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vocoder? |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Sun Mar 05, 2017 4:08 pm Post subject:
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Not a vocoder strictly .. but close ... if you could get it to detect .. say with certain intervals .. and make them control a bunch of oscillators .. it would be some cool sort of resynthesis I think. A bit like .. the speaking piano ... https://www.youtube.com/watch?v=muCPjK4nGY4
Edit : heh .. I needed the Grumble vocoder remark to recall the speaking piano :-) _________________ Jan
also .. could someone please turn down the thermostat a bit.
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JovianPyx
Joined: Nov 20, 2007 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
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Posted: Sun Mar 05, 2017 4:20 pm Post subject:
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Grumble wrote: | vocoder? |
No, if you read the datasheet, you'll see that the output is a logic level that says when the input signal is "within range" of the target frequency. As such, it does not perform anything like a filter. Internally, there is a phase locked loop which is used to detect whether the frequency is in the target range. This is a very special purpose IC that was probably used in the days of early touch tone telephone circuits. It can also be used to detect data bits on an FSK stream.
What I see in the datasheet (again, I strongly suggest downloading and reading it) is that there is a VCO inside it as part of the PLL. Pin 2 appears to be possibly a CV input (which if it is will be linear, not expo) and pins 5 and 6 appear to be R and C connections for the VCO. Any more than that, you'll want to read about to understand better. So it might (stress on "might") work as a linear VCO, but it is most likely a rectangular or square wave output - if you can actually access the VCO output. Probably pin 6 might have a waveform on it, but you'd have to get one, hook it up and scope the output to see/hear if it's anything you could use in a synth. _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
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gasboss775
Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Mon Mar 06, 2017 4:32 am Post subject:
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One idea that crossed my mind was some sort of trigger pulse generator that was triggered by a specific frequency from an external source, such as a musical instrument a recording or someone's voice. Not sure how well it would perform when the frequency of interest is surrounded by other signals, does the input need to be quite pure? |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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gasboss775
Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Mon Mar 06, 2017 5:18 pm Post subject:
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Thanks folks!
PHOBoS that Dr Who one looks potentially interesting!
Some ideas then:
(I) Sound to light circuit, not of much practical use but is you're into blinking lights!
(ii) Sound to trigger interface. Generates a trigger pulse whenever a specific frequency is detected.
(iii) Operating solenoids for sound triggered animatronics! OR triggering acoustic instruments with a solenoid/ motor.
(iv) Analogue tape sync interface, does anyone use tape anymore?
(v) Remote control for your modular!
Probably one of the more practical circuits on the data sheet; A quadrature square wave oscillator. Could be useful as an LFO. |
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