Designing an oscillator

P

Prasad

Guest
Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of using
a wein bridge type, but not sure of the result over a range of frequencies.
Any suggestions welcome.

Thanks.
Prasad
 
I read in sci.electronics.design that Prasad <pkp0000@hotmail.com> wrote
(in <c3pvum$2aov1b$1@ID-152984.news.uni-berlin.de>) about 'Designing an
oscillator', on Tue, 23 Mar 2004:
Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of using
a wein bridge type, but not sure of the result over a range of frequencies.
Any suggestions welcome.

For that 1-octave range, a Wien Bridge is quite OK. You could even make
two Wien networks, one for 10 kHz and one for 20 kHz, put a pot between
the two 4-component nodes and thus get frequency control from just the
one pot. If you don't understand, I'll put a binary on
alt.binaries.schematics.electronic.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Tue, 23 Mar 2004 23:51:17 +0530, "Prasad" <pkp0000@hotmail.com>
wrote:

Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of using
a wein bridge type, but not sure of the result over a range of frequencies.
Any suggestions welcome.

Thanks.
Prasad

74HC4064 as osc, 4040 counter driving address lines of small EPROM,
r2r ladder, some low pass?
 
"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:p7k16050o4thj736avrffmr1raovon43rf@4ax.com...
On Tue, 23 Mar 2004 23:51:17 +0530, "Prasad" <pkp0000@hotmail.com
wrote:

Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of using
a wein bridge type, but not sure of the result over a range of frequencies.
Any suggestions welcome.

Thanks.
Prasad

74HC4064 as osc, 4040 counter driving address lines of small EPROM,
r2r ladder, some low pass?
4060 (osc with counter) + eprom.

MAX038 (get a free sample of MAXIM website).

Wein bridge

PC sound card with software (waveedit or similar).

Google sini wave oscillator.

SioL
 
Prasad <pkp0000@hotmail.com> wrote in message
news:c3pvum$2aov1b$1@ID-152984.news.uni-berlin.de...
Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of
using
a wein bridge type, but not sure of the result over a range of
frequencies.
Any suggestions welcome.

Thanks.
Prasad
A 20kHz-40kHz Square wave oscillator feeding a divide by 2, then to a 20kHz
low-pass filter with a notch at 30kHz. (say 3 caps, 1 inductor).
=No messy/cantankerous automatic level control needed.
regards
john
 
In article <Xp48c.6869$%x4.910885@news.siol.net>, SioL <spam@spam.com> wrote:
"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
[.. making a sine wave ..]
4060 (osc with counter) + eprom.

MAX038 (get a free sample of MAXIM website).

Wein bridge

PC sound card with software (waveedit or similar).
Phase shift oscillator.

A 8051 clone with a DAC.

A steam engine, gear train, cam and pot.


--
--
kensmith@rahul.net forging knowledge
 
In article <c3qrba$k6s$1@news5.svr.pol.co.uk>,
John Jardine <john@jjdesigns.fsnet.co.uk> wrote:
Prasad <pkp0000@hotmail.com> wrote in message
news:c3pvum$2aov1b$1@ID-152984.news.uni-berlin.de...
Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of
using
a wein bridge type, but not sure of the result over a range of
frequencies.
[...]
A 20kHz-40kHz Square wave oscillator feeding a divide by 2, then to a 20kHz
low-pass filter with a notch at 30kHz. (say 3 caps, 1 inductor).
=No messy/cantankerous automatic level control needed.
regards
Better yet, a 200-400KHz oscillator feeding a PEEL22CV10 with 10 resistors
on its output and a simple RC filter to clean it up.

With a Johnson counter and 10 resistors, you can make a 20 step
approximation of a sine wave.

--
--
kensmith@rahul.net forging knowledge
 
See earlier posting here, Subject: Lots more about R-C sinusoidal
oscillators. 29 January 1988. (It's in the Google WWW archive and
possibly others.) Compares some classic R-C approaches and also monolithic
R-C sinusoidal oscillators. References to Clarke and Hess's classic text,
to the National App Note, and to one or two minor publications on sinusoidal
oscillators in the 1970s. There may be other newsgroup tutorial articles on
the subject as well.

(It can pay to check the archives.)


"Prasad" <pkp0000@hotmail.com> wrote in message
news:c3pvum$2aov1b$1@ID-152984.news.uni-berlin.de...
Hello,
I need to design a variable frequency sine wave oscillator to cover
10KHz to 20 KHz. Can't decide the best configuration. Was thinking of
using
a wein bridge type, but not sure of the result over a range of
frequencies.
Any suggestions welcome.
 
For that 1-octave range, a Wien Bridge is quite OK. You could even make
two Wien networks, one for 10 kHz and one for 20 kHz, put a pot between
the two 4-component nodes and thus get frequency control from just the
one pot. If you don't understand, I'll put a binary on
alt.binaries.schematics.electronic.
--
Thanks john. I prefer this solution. I think I understand the idea, but
still a binary is very much welcome.

Prasad.
 
I read in sci.electronics.design that Prasad <pkp0000@hotmail.com> wrote
(in <c3v0mq$2c41kc$1@ID-152984.news.uni-berlin.de>) about 'Designing an
oscillator', on Thu, 25 Mar 2004:
For that 1-octave range, a Wien Bridge is quite OK. You could even make
two Wien networks, one for 10 kHz and one for 20 kHz, put a pot between
the two 4-component nodes and thus get frequency control from just the
one pot. If you don't understand, I'll put a binary on
alt.binaries.schematics.electronic.
--

Thanks john. I prefer this solution. I think I understand the idea, but
still a binary is very much welcome.

OK, look for 'Single-tuned Wien Bridge'. It's a JPEG: I couldn't
compress a GIF sufficiently.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 

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