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Old 1st April 2008, 06:25 PM   #1
fluc is offline fluc  Canada
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Default Piezo pushbutton

Hello everyone,

I am looking for some piezo pushbutton in Canada or the USA. The ones I found are quite expensif. About $20.00. Anyone know of a good supplier?

We are having a hard time with our door bell buttons that keep freezing. Looking for something that will resist the hard Canadian winter.

Kind Regards,
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Old 2nd April 2008, 04:37 AM   #2
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Take one out of a cheap cigarette lighter.

I_F
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Old 3rd April 2008, 12:28 PM   #3
fluc is offline fluc  Canada
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Quote:
Originally posted by I_Forgot
Take one out of a cheap cigarette lighter.

I_F
Thanks.

Anyone tried this before?
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Old 3rd April 2008, 01:26 PM   #4
star882 is offline star882  United States
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Install a resistor inside to keep it warm?
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"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 3rd April 2008, 05:15 PM   #5
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Quote:
Originally posted by I_Forgot
Take one out of a cheap cigarette lighter.

I_F
He wants it to ring a doorbell; not ignite a gas grill.

Piezo Switch

Piezo Electric Ignition
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Old 4th April 2008, 01:45 AM   #6
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Quote:
Originally posted by theAnonymous1


He wants it to ring a doorbell; not ignite a gas grill.

Piezo Switch

Piezo Electric Ignition
The man asked for a piezo pushbutton. He didn't say what he wants to do with it. I have no idea what good it would do in the context of a doorbell but he might have some interesting idea.

I_F
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Old 4th April 2008, 02:16 AM   #7
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Quote:
Originally posted by I_Forgot
The man asked for a piezo pushbutton. He didn't say what he wants to do with it.
Sorry, I thought the application as described in the original post was obvious.

Quote:
Originally posted by I_Forgot
I have no idea what good it would do in the context of a doorbell but he might have some interesting idea.
Well if the igniter is wired correctly the doorbell will no longer be needed. He will know when someone is at the door when they yelp in pain.
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Old 4th April 2008, 01:18 PM   #8
fluc is offline fluc  Canada
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Thanks for the replies. I had a good laugh at the last posts.

I do need a door bell pushbutton and not a gas grill igniter.
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Old 4th April 2008, 01:21 PM   #9
fluc is offline fluc  Canada
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Quote:
Originally posted by star882
Install a resistor inside to keep it warm?
This is a good idea. Now how do we insert a resistor inside the button?
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Old 4th April 2008, 01:42 PM   #10
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Quote:
Originally posted by fluc


This is a good idea. Now how do we insert a resistor inside the button?
1. Open button up with a screwdriver.
2. Replace light with resistor operating just within it's power rating.
3. Close the button back up.

Doorbells usually operate between 12 and 24 VAC. The switches often have a small lamp inside that lights up so people can find the switch when it is dark outside. The lamp connects in series between the transformer and the bell. It doesn't allow enough current to pass to ring the bell, but does allow enough to light the lamp. The button is wired in parallel with the lamp. When you push the button, you short the lamp and it goes out, the bell rings. If you replace the lamp with a resistor that dissipates 1/4 or 1/2 W it will stay warm and prevent the button from icing up. Resistor is selected based on the amount of current that will prevent the bell from ringing, and will heat up the resistor which depoends on the voltage used in your system.

Measure the voltage. Calculate resistance required to dissipate 1/4 or 1/2 W. Get that resistor and try it to make sure it doesn't ring the bell. Install it in parallel with the switch. Done.

I_F
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