Class D driver

epilot · 24th July 2006, 08:20 PM

Hi,

I need a class D amplifier that works at 60kHz as a piezo driver
I was not able to find a popular chip in my location so it should be made of transistors.

Thanks

SpittinLLama · 24th July 2006, 11:38 PM

Why do u want to use a Class D amp to drive a piezo?

-SL

epilot · 25th July 2006, 02:22 AM

Quote:

Originally posted by SpittinLLama
Why do u want to use a Class D amp to drive a piezo?

-SL

Just for a project

SpittinLLama · 25th July 2006, 05:09 PM

Well a piezo speaker looks more like a capacitor than a inductor and resistor like a dynammic speaker using a voice coil. Not sure how Class D would hanlde this load plus a piezo is more efficient than a dynamic so fi you want Class D for efficiency you may not need it really. Maybe someone who has tried to do what you are can give some input.

-SL

3-LockBox · 26th July 2006, 05:38 PM

Curious to know what kind of project it is.

Is building the amp yourself a requirement of the project or are you just trying to save some money. Otherwise, any old amp will do if all your doing is driving a piezo. But you need to add a resistor at least, or you could burn up an amp, Class D or otherwise.

phase_accurate · 27th July 2006, 05:39 AM

Do you just want to reproduce 60 kHz constantly and nothing else ?
In this case there are simpler solutions than a class d amp.
How about a switching stage (50% duty cycle) followed by a tank circuit ? The latter could even be used to transform the audio to a higher voltage if needed.

Regards

Charles

kartino · 27th July 2006, 06:55 AM

Some kind of mosquito or rat repellent? Why don't use simple signal generator?

Or it is just project?

Howard Tam · 31st August 2006, 07:49 PM

Hi !

You could look into Apex Micortechnology, they had good class D
piezo driver.

http://eportal.apexmicrotech.com/mainsite/

24th July 2006, 08:20 PM	#1
epilot diyAudio Member Join Date: Jul 2006	Class D driver Hi, I need a class D amplifier that works at 60kHz as a piezo driver I was not able to find a popular chip in my location so it should be made of transistors. Thanks

26th July 2006, 05:38 PM	#5
3-LockBox diyAudio Member Join Date: May 2006	Curious to know what kind of project it is. Is building the amp yourself a requirement of the project or are you just trying to save some money. Otherwise, any old amp will do if all your doing is driving a piezo. But you need to add a resistor at least, or you could burn up an amp, Class D or otherwise. __________________ (insert clever anecdote here)

31st August 2006, 07:49 PM	#8
Howard Tam diyAudio Member Join Date: Apr 2005 Location: Hong Kong/China	Piezo driver Hi ! You could look into Apex Micortechnology, they had good class D piezo driver. http://eportal.apexmicrotech.com/mainsite/

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24th July 2006, 11:38 PM	#2
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	Why do u want to use a Class D amp to drive a piezo? -SL

25th July 2006, 05:09 PM	#4
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	Well a piezo speaker looks more like a capacitor than a inductor and resistor like a dynammic speaker using a voice coil. Not sure how Class D would hanlde this load plus a piezo is more efficient than a dynamic so fi you want Class D for efficiency you may not need it really. Maybe someone who has tried to do what you are can give some input. -SL

27th July 2006, 05:39 AM	#6
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Do you just want to reproduce 60 kHz constantly and nothing else ? In this case there are simpler solutions than a class d amp. How about a switching stage (50% duty cycle) followed by a tank circuit ? The latter could even be used to transform the audio to a higher voltage if needed. Regards Charles

27th July 2006, 06:55 AM	#7
kartino diyAudio Member Join Date: Feb 2005 Location: Gunungkidul Indonesia	Some kind of mosquito or rat repellent? Why don't use simple signal generator? Or it is just project?

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