Tube Amps / Music Electronics
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|3/31/2006 9:12 PM|
||counter for pickup winder|
I'm trying to make a pickup winder and I'm having trouble figuring out the counter/reed switch/magnet set up. Does the speed of the winder dictate what counter and reed switch I use? Or will they all keep up with unlimited rpm speed of the winder? Or can anyone tell me which counter and switch they bought? And what speed is a good speed to wind at? Thanks in advance!
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|4/1/2006 11:21 AM|
you can use cd4511 and cd4510 ic to make a counter,(search on web)and build a rotate speed circuit ,this is the signal source circuit .
|4/1/2006 11:43 AM|
The best solution I found was to buy a Red Lion Cub 4 counter with lithium battery power. They can be found refurbished for $30.00 - $40.00. They have a debounce circuit built into them that works up to 5,000 RPM. I forget the mouser reed switch part number but I found the number from someone else's winder specs. on the internet. I epoxied a tiny 3/16" rare earth magnet I got from Radio Shack to the winder base plate to activate the reed switch with each revolution. I works like a charm.
|4/1/2006 4:52 PM|
On 4/1/2006 6:43 PM, Jon Gundry said:
For instance, part number HE502-ND (switch, $0.78) plus HE510-ND (alnico magnet, $1.24) or HE153-ND (rare earth? magnet, $1.24).
At the low power of the CLUB3 circuit, a reed switch is good for billions of operations, so the switch will likely outlive the winder.
For general info on reed switches:
|4/1/2006 6:01 PM|
I have a radio shack reed switch....it counts nicely up to bout 400 rpm's then it just starts skipping counts......also a good cheap counter can be gotten from kessler ellis prodcts....the "mini kal" is like 14 lousy bucks(a real cheap investment thats wound me accurately for quite a while now)....I rigged a resetable switch to mine.
|4/1/2006 6:55 PM|
Yeah, that's what I've seen, that some counters only go to like 600 rpm (and then they would start miscounting as far as I can see). I would like to wind at maybe 1000-1500 rpm or so, and I was wondering what would work with the faster set up. I do have a bunch of reed switches and a counter now (although I don't have the right power supply). I've seen some Cub 3's for cheap, maybe I'll go with that. Thanks for your input!
|4/2/2006 12:30 PM|
On 4/2/2006 1:55 AM, sploar said:
It sounds like the magnet isn't strong enough, or actuates the reed for too small a portion of a turn, so at high speed the reed doesn't see enough of a magnetic variation to switch.
That said, it will take some fiddling to find the right mechanical setup to get a reed switch count to 6000 rpm.
I didn't try to do this, instead using an optical encoder, because I also wanted the 500 counts-per-turn output. I get up to 1,700 rpm with the present setup, far faster than I can wind without wire breakage. The limit is the winder, not the enc oder and counter.
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