FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   PreferencesPreferences   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Forum index » Electronix » Misc
AC+DC adder to drive Piezo
Post new topic   Reply to topic Page 1 of 1 [14 Posts] View previous topic :: View next topic
Author Message
titinicolas77@gmail.com
electronics forum beginner


Joined: 26 Jun 2006
Posts: 3

PostPosted: Mon Jun 26, 2006 7:23 pm    Post subject: AC+DC adder to drive Piezo Reply with quote

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

I tried to use a high-power, ultra-fast OpAmp to make a simple adder.
The problem I got so far is that the rising time is killed when I
connect the piezo (C=600nF). I need a rising time of less than 10us for
Vpp=20V.
The other problem with this design is that the 2 drivers output are not
isolated from each other.

Does anyone has an idea on how I can solve my problem.
Does anyone know good reference (book, web site...) to build piezo
drivers.

Thank you very much for your help.
Back to top
hhc314@yahoo.com
electronics forum addict


Joined: 11 Sep 2005
Posts: 88

PostPosted: Tue Jun 27, 2006 4:14 am    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

Why would you or anyone need a d.c. piezo driver? I'm obviously
missing something here.

Harry C.


titinicolas77@gmail.com wrote:
Quote:
Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

I tried to use a high-power, ultra-fast OpAmp to make a simple adder.
The problem I got so far is that the rising time is killed when I
connect the piezo (C=600nF). I need a rising time of less than 10us for
Vpp=20V.
The other problem with this design is that the 2 drivers output are not
isolated from each other.

Does anyone has an idea on how I can solve my problem.
Does anyone know good reference (book, web site...) to build piezo
drivers.

Thank you very much for your help.
Back to top
jasen
electronics forum Guru Wannabe


Joined: 18 Jun 2006
Posts: 204

PostPosted: Tue Jun 27, 2006 8:58 am    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

On 2006-06-26, titinicolas77@gmail.com <titinicolas77@gmail.com> wrote:
Quote:
Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).

these figures represent what?

Quote:
I want to build something that can add those two signals.

connect the devices in series?

use a resistor network?

Quote:
I tried to use a high-power, ultra-fast OpAmp to make a simple adder.
The problem I got so far is that the rising time is killed when I
connect the piezo (C=600nF). I need a rising time of less than 10us for
Vpp=20V.
The other problem with this design is that the 2 drivers output are not
isolated from each other.

tell us what else you need first.

Quote:
Does anyone has an idea on how I can solve my problem.

no idea what your problem is.

Quote:
Does anyone know good reference (book, web site...) to build piezo
drivers.

seems like a push-pull outyput stage is all that's needed...

Bye.
Jasen
Back to top
titinicolas77@gmail.com
electronics forum beginner


Joined: 26 Jun 2006
Posts: 3

PostPosted: Tue Jun 27, 2006 6:58 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

I need a DC piezo driver because I use the piezo as a linear motor in
the nano-micrometer range.
So by changing the DC voltage I change the piezo length.
This is very common in (nano) physics research lab.

hhc314@yahoo.com wrote:
Quote:
Why would you or anyone need a d.c. piezo driver? I'm obviously
missing something here.

Harry C.

Back to top
hhc314@yahoo.com
electronics forum addict


Joined: 11 Sep 2005
Posts: 88

PostPosted: Tue Jun 27, 2006 8:38 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

Thanks, that makes sense. I've seen similar things done in Mossbauer
effect type work.

Harry C.


titinicolas77@gmail.com wrote:
Quote:
I need a DC piezo driver because I use the piezo as a linear motor in
the nano-micrometer range.
So by changing the DC voltage I change the piezo length.
This is very common in (nano) physics research lab.

hhc314@yahoo.com wrote:
Why would you or anyone need a d.c. piezo driver? I'm obviously
missing something here.

Harry C.

Back to top
John Fields
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3260

PostPosted: Tue Jun 27, 2006 9:12 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

On 26 Jun 2006 12:23:27 -0700, titinicolas77@gmail.com wrote:

Quote:
Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?


--
John Fields
Professional Circuit Designer
Back to top
titinicolas77@gmail.com
electronics forum beginner


Joined: 26 Jun 2006
Posts: 3

PostPosted: Wed Jun 28, 2006 7:22 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

Yes, correct.


John Fields wrote:
Quote:
On 26 Jun 2006 12:23:27 -0700, titinicolas77@gmail.com wrote:

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?


--
John Fields
Professional Circuit Designer
Back to top
John Fields
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3260

PostPosted: Wed Jun 28, 2006 8:21 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

On 28 Jun 2006 12:22:37 -0700, titinicolas77@gmail.com wrote:

Quote:
Yes, correct.

---
Then why, after I politely asked you to bottom post, as is the
custom in these groups, did you so rudely top post?

You want free help but you want it on your own terms?

Maybe someone else will help you, but I won't.

--
John Fields
Professional Circuit Designer


Quote:
John Fields wrote:
On 26 Jun 2006 12:23:27 -0700, titinicolas77@gmail.com wrote:

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?


--
John Fields
Professional Circuit Designer
Back to top
cbarn24050@aol.com
electronics forum Guru Wannabe


Joined: 19 Sep 2005
Posts: 180

PostPosted: Thu Jun 29, 2006 2:49 am    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

titinicolas77@gmail.com wrote:
Quote:
Yes, correct.


John Fields wrote:
On 26 Jun 2006 12:23:27 -0700, titinicolas77@gmail.com wrote:

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?


--
John Fields
Professional Circuit Designer

A simple capacitor/diode clamp circuit would seem to do
Back to top
jasen
electronics forum Guru Wannabe


Joined: 18 Jun 2006
Posts: 204

PostPosted: Thu Jun 29, 2006 7:49 am    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

On 2006-06-27, titinicolas77@gmail.com <titinicolas77@gmail.com> wrote:
Quote:
I need a DC piezo driver because I use the piezo as a linear motor in
the nano-micrometer range.
So by changing the DC voltage I change the piezo length.
This is very common in (nano) physics research lab.

if both sources are ground referenced hook the DC source to one
terminal and the AC source to the other end

Bye.
Jasen
Back to top
Mike_in_SD
electronics forum beginner


Joined: 27 Jun 2006
Posts: 5

PostPosted: Thu Jun 29, 2006 5:34 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

So whats up with the request to bottom post ..

what is convenient for some is a pain for others

when you have people that insist on posting the whole
post of the previous poster, its a pain to have to
scroll thru the history to get to a one line answer.

bottom posting never did make sense







cbarn24050@aol.com wrote in <1151549381.945040.139300
@i40g2000cwc.googlegroups.com>:

Quote:

titinicolas77@gmail.com wrote:
Yes, correct.


John Fields wrote:
On 26 Jun 2006 12:23:27 -0700, titinicolas77@gmail.com wrote:

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?


--
John Fields
Professional Circuit Designer

A simple capacitor/diode clamp circuit would seem to do
Back to top
John Fields
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3260

PostPosted: Thu Jun 29, 2006 6:47 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

On Thu, 29 Jun 2006 17:34:19 GMT, Idontthinkso@nospam.com
(Mike_in_SD) wrote:

Quote:

So whats up with the request to bottom post ..

what is convenient for some is a pain for others

when you have people that insist on posting the whole
post of the previous poster, its a pain to have to
scroll thru the history to get to a one line answer.

bottom posting never did make sense

---
When you're inconsiderate of others who may come to the thread some
time after it started, then it may not seem to make much sense, even
though it does. You don't read a book backwards, and it's
inconsiderate to force others to read a series of articles
chronologically backwards.


Even Google thinks so.

From:

http://groups.google.com/support/bin/answer.py?answer=12348&topic=250


"Summarize what you're following up.

When you click "Reply" under "show options" to follow up an existing
article, Google Groups includes the full article in quotes, with the
cursor at the top of the article. Tempting though it is to just
start
typing your message, please STOP and do two things first.
Look at the quoted text and remove parts that are irrelevant.
Then, go to the BOTTOM of the article and start typing there.
Doing this makes it much easier for your readers to get through your
post. They'll have a reminder of the relevant text before your
comment, but won't have to re-read the entire article.
And if your reply appears on a site before the original article
does,
they'll get the gist of what you're talking about."


---
BTW, speaking of being considerate, you need to clean up your
punctuation as well as learn to top-post as the Romans do.


--
John Fields
Professional Circuit Designer
Back to top
JeffM
electronics forum Guru


Joined: 02 May 2005
Posts: 1007

PostPosted: Thu Jun 29, 2006 7:10 pm    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

Quote:
So whats up with the request to bottom post ..
Mike_in_SD

It called "When in Rome...".


Quote:
what is convenient for some is a pain for others

Stop being selfish--or find a Web-based forum.


Quote:
when you have people that insist on
posting the whole post of the previous poster,

They are (generally speaking) totally wrong and stupid.


Quote:
its a pain to have to scroll thru the history
to get to a one line answer.

That would be DIRECT evidence that the idiot who posted that

doesn't know what he is doing.
If someone does in fact need that much context (see below),
he should probably be middle-posting (as I have done here).

Quote:
bottom posting never did make sense

When you see it done wrong, it's easy to ASSuME that.

Do you constantly use
the WORST examples you come across in your daily life as templates
or consider them to be excuses for making up your own rules.

Here's the proper technique on Usenet:
1) TRIM OUT anything that does not
DIRECTLY correspond to your response.
2) Make your addition BELOW that
so that what results will read like a *dialog*
--not an event and a flashback.
Back to top
jasen
electronics forum Guru Wannabe


Joined: 18 Jun 2006
Posts: 204

PostPosted: Fri Jun 30, 2006 8:59 am    Post subject: Re: AC+DC adder to drive Piezo Reply with quote

["Followup-To:" header set to sci.electronics.misc.]
On 2006-06-29, Mike_in_SD <Idontthinkso@nospam.com> wrote:

Quote:
So whats up with the request to bottom post ..

it puts stuff in chronological (or conversation) order.

Quote:
when you have people that insist on posting the whole
post of the previous poster, its a pain to have to
scroll thru the history to get to a one line answer.

That's what the page-down key is for.


having to scroll to the bottom of the post to see what your talikng
about and then back up to the message is worse.

Bye.
Jasen
Back to top
Google

Back to top
Display posts from previous:   
Post new topic   Reply to topic Page 1 of 1 [14 Posts] View previous topic :: View next topic
The time now is Wed Dec 13, 2017 1:30 am | All times are GMT
Forum index » Electronix » Misc
Jump to:  

Similar Topics
Topic Author Forum Replies Last Post
No new posts USB Flash drive failed Shaamil components 0 Thu Jul 20, 2006 5:17 am
No new posts USB Hard drive problem Seany Repair 7 Fri Jul 14, 2006 2:33 pm
No new posts Hardbox USB drive's power supply news.news Repair 0 Sun Jul 09, 2006 4:17 pm
No new posts Specs for Murata piezo-speaker Arild P. components 6 Fri Jun 23, 2006 10:45 am
No new posts Orcad Layout split planes drive me nuts... Fred Bartoli cad 2 Wed Jun 07, 2006 9:41 pm

Copyright © 2004-2005 DeniX Solutions SRL
Other DeniX Solutions sites: Unix/Linux blog |  Unix/Linux documentation |  Unix/Linux forums |  Medicine forum |  Science forum  |  Send and track newsletters


Powered by phpBB © 2001, 2005 phpBB Group