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DIY "FEED BACK CLOCK" Answered

Ok, so I'm currently playing with the idea of making a "feedback clock". Except 1 to 12 is now replaced with 12 speakers, and only having one the hand which would have a microphone attached to the end of the arms. For the rotation of the arm, a geared DC motor.

The problem I have is in the construction of this mechanism, so any help or thoughts would be welcomed. My original thought is constructing an amplifier with 12 outputs and 1 input. The input being a receiver, transmission coming from from the microphones attached to end of the arms. OR would it be possible to make individual smaller amps for each speaker and split take the signal from the receiver in to each amp?
If I was to do a multi-channel out put amp, does anyone know what circuit design I would be looking at? 


Discussions

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caitlinsdad
caitlinsdad

6 years ago

How big of a clock were you planning to make? Was this to get musical feedback or just noise when the microphone approaches the speaker. Did you want each speaker to play something different? The speakers could be wired up in parallel or series or use a single speaker mechanically ported to soundholes in the clockface. You need something like a slip ring connector so the microphone cables do not tangle up when it rotates. Is the feedback processed in any way? You could simulate this all electronically.

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caitlinsdad
caitlinsdad

Reply 6 years ago

and was this some take on the rotating speaker "Leslie" effect?

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asluyters
asluyters

Reply 6 years ago

can I just confirm that you only get feedback if there's already a sound spike already in the loop? I was just wondering, if there was utter silence if you'd get any feedback at all?

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Harol Erreip
Harol Erreip

Reply 6 years ago

Thanks for this! It is just to get noise feedback when the microphone approaches. As there will be microphones on the either end of the arm, the speakers which are directly opposite on the clock face will both be feeding back as the microphone approaches. The feedback wont be processed either.
How do I approach the impedance when connected the speakers in parallel? Would one home built amp be enough to power all 12?

I am thinking about building a prototype clock 12" diameter, and the move on to one which is 24".

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caitlinsdad
caitlinsdad

Reply 6 years ago

http://www.regiscoyne.com/tech/spk_cab_wiring/ I am not well versed in speaker cabinet building.  adafruit.com has a slip ring connector. If you don't have a speed control on your motor I guess all you will get is a high pitched warbling siren.