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Old 30th March 2005, 02:50 AM   #1
garbage is offline garbage  Singapore
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Default piezo switch?

hi all

can a piezo switch be used to replace a normal mechnical switch?
for example the play button of a cdp?

schurter piezo switch

thanks.
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Old 30th March 2005, 03:47 AM   #2
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They can't take the current or voltage from switching mains power if thats what your asking. They list max volts as 42AC, current depends on the model, most of them are 100mA.

However you could set up a relay circuit that would use one of these switches.
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Old 30th March 2005, 03:50 AM   #3
garbage is offline garbage  Singapore
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if i used them as replacement for my cdp's play button, would that work? do i wire them straight (for the non lighted piezo switches) in or do i need supporting circuitry?
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Old 30th March 2005, 03:55 AM   #4
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Quote:
Originally posted by garbage
if i used them as replacement for my cdp's play button, would that work? do i wire them straight (for the non lighted piezo switches) in or do i need supporting circuitry?
Found this on their site:

http://www.schurterinc.com/products/..._piezo_exp.asp

They are cool but may require a lot more design and electronics.

You can use the voltage output as input for a digital logic circuit too, which is also shown on the site.


It will probably work as a replacement for the play button, but im thinking you will need a buffer and possibly an inverter to interface.
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Old 30th March 2005, 03:57 AM   #5
garbage is offline garbage  Singapore
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i actually saw that information, but was not too sure if i needed relays.
there was no other infomation on that site as well.

so, just wondering if anyone has tried using these switches.
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Old 31st July 2005, 07:06 PM   #6
using_e is offline using_e  Austria
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Default I've tried the Schurter piezo switches

When I first saw these Schurter piezo switches with their ring LED illumination I couldn't resist. The first problem -->price!
The price I paid for two of these babys, someone else is already doing a complete project for. I payed about $200 for one pair. If it were just the price it would have been my smallest problem but........ getting these damn switches to do what they are planned for is another thing.

I wanted to use them as main switches for on/off. So my idea was to use a simple JK-FlipFlop (Logic IC 7473), connect the output to a transistor and switch a relais. I've done this already a few times with normal mechanical switches and always no trouble at all. It's just a few minutes work to adjust the two resistors (see picture below) to their optimum value and that's it. But this time ......no! These piezo switches output a variable pulse between 20 to 1000ms depending on how hard you press them. I've spent days to look for the optimum values for the two resistors to find a compromise which works with all impulse lengths but ....nope....no chance!

I'm already loosing my will to carry on so any help on this subject is appreciated.

Thanx
using_e
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