I'm trying to help my father who is quite hard of hearing.
He has a little piezo beeper timer that he uses for cooking - carries it in his hand or pocket while it's counting - however the range/volume are slowly slipping out of audible for him. That's even with a hearing aid factored in.
Wondering if I can drop the frequency of a piezo timer in any easy way, like by soldering a cap or resistor in? I can't afford to lose volume, though.
TIA for any suggestions.
Non-Automotive Electronics Question
Moderator: RichardW
From what I can see after a little digging on the net, the frequency of sound produced is a function of the frequency of power supplied, i.e. how rapidly the power supply to the piezo material is switched on and off.
From this website: http://justanotherlanguage.org/content/ ... orial_pwm2
Also according to the above, the duty cycle controls the output volume, although they appear to be talking about using a particular chip for the control (and this is a little beyond me at the moment.)
It is a long time since I've studied electronics, but from what I do understand of that page it may be more complicated than adding in a resistor or capacitor. A lot may depend on the circuitry that is already there and if you can access the control chip.
Beyond that I'm not having a lot of luck digging anything up and I never covered piezoelectrics during any of my electronics courses to fall back on other knowledge, sorry.
From this website: http://justanotherlanguage.org/content/ ... orial_pwm2
Also according to the above, the duty cycle controls the output volume, although they appear to be talking about using a particular chip for the control (and this is a little beyond me at the moment.)
It is a long time since I've studied electronics, but from what I do understand of that page it may be more complicated than adding in a resistor or capacitor. A lot may depend on the circuitry that is already there and if you can access the control chip.
Beyond that I'm not having a lot of luck digging anything up and I never covered piezoelectrics during any of my electronics courses to fall back on other knowledge, sorry.
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2001 Toyota MR2 1.8 VVTi - To be sold for spares/repair - dead gearbox
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Easier solution, buy him a flashing light or vibrating timer ?!
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My past Citroens :-
'00 Xantia SX HDI, now dead due to accident
'99 Xantia HDI 110 Exclusive, RIP
'97 Xantia TD SX
'96 Xantia TD LX
'96 ZX TD
'89 BX TD
'88 AX GT
'79 CX2400 Pallas (scrapped )
& a couple of Peugeots !
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It is a few years since I worked with this sort of stuff, but I think that piezo transducers are self-resonant, which is why they are so efficient. This means that you can't change the frequency much.
If you can find a suitable DC signal, maybe you can fit a vibrator unit from an old phone (old ones are best because they were designed to shake a phone with a lot of mass).
If you can find a suitable DC signal, maybe you can fit a vibrator unit from an old phone (old ones are best because they were designed to shake a phone with a lot of mass).