KVR Audio

knockman · Post by **knockman** » Sun Nov 13, 2011 4:44 am

I'm working on another recycled junk project - a cheap and cheerful rotary speaker.

An old tape deck motor spins a coffee dripper over speaker. Speed is currently adjusted by a PC fan controller or switching the voltage on a wall wart. I need to make a proper PWM motor controller to go from 0~12V.

It's small and low powered. I'm using a Ruby amp driving a small Fostex speaker. http://www.runoffgroove.com/ruby.html

Test drive with guitar (excuse poor playing)

toine6 · Post by **toine6** » Sun Nov 13, 2011 5:03 am

You went through a lot of trouble. The results are very nice though

tommy_d · Post by **tommy_d** » Sun Nov 20, 2011 5:36 pm

That's genius.

Hink · Post by **Hink** » Sun Nov 20, 2011 8:52 pm

it really is awesome, for speed control check this site

http://www.hobbyengineering.com/SectionEK.html

that link takes you to the site but not the page I was on but they do have motors and various speed control units

edit: correction...that's the right page you just have to scroll down

Barnadine · Post by **Barnadine** » Mon Nov 21, 2011 1:52 am

Brilliant.

knockman · Post by **knockman** » Tue Dec 06, 2011 3:09 am

Thanks for the comments folks

I've been a little too busy with the dull duties of the 'real' world for a few weeks, so only just had a chance to work more on this. I've now done the enclosure up and made a proper control panel.

@Hink - thanks for the link. In fact I made a simple PWM circuit that I guess is rather similar to that kit. I already have a lot of components so I only needed a 555 timer chip and a pack of 5 costs about $1.50, so very cheap to make. Unfortunately, the motor I have is a little noisy when pulsing on and off, so either I need a more sophiticated circuit or some form of enclosure to block out the noise.

Here's some photos:

It's covered in blue vinyl table cloth - Poor-folks Tolex

I need to do some small cosmetic jobs to finish it off, especially the front needs work on the edges around the hole and the grill is temporary for now - just some plastic gardening mesh. I'm on the look out for something nicer.

Some updated audio and video to follow soon.

dusted william · Post by **dusted william** » Tue Dec 06, 2011 3:13 am

really awesome!

dw

Hink · Post by **Hink** » Tue Dec 06, 2011 5:14 pm

amazing work

DrApostropheX · Post by **DrApostropheX** » Tue Dec 06, 2011 7:18 pm

That is seriously genius!!

AdmiralQuality · Post by **AdmiralQuality** » Tue Dec 20, 2011 9:05 pm

Love it!

coffee cone spinner - rotary speaker