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Clarence_A
Guest
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 Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Lookinf for options for an Absolute Magnitude" or precision |
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Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
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Jim Thompson
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
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On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com> wrote:
| Quote: |
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
|
Frequency?
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food. |
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Jim Thompson
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
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On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com> wrote:
| Quote: |
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
|
See.....
Newsgroups: alt.binaries.schematics.electronic
Subject: S.E.D: Looking for Options for an "Absolute Magnitude" or
Precision Rectifier Circuit - FullWaveRectifier.pdf
Message-ID: <bf9a01h17l790bt3ek9p4cj9grjv4c1mkh@4ax.com>
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
|
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Clarence_A
Guest
|
| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
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"Jim Thompson" <thegreatone@example.com> wrote in message
news:q56a01d0hpknjjq721f3c4fotc8ln8t6n0@4ax.com...
| Quote: | On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
Frequency?
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380 to 800 HZ |
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Clarence_A
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
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"Jim Thompson" <thegreatone@example.com> wrote in message
news:sk9a01t7qtiusap2kuun3g2t3kbsupbp4l@4ax.com...
| Quote: | On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
See.....
Newsgroups: alt.binaries.schematics.electronic
Subject: S.E.D: Looking for Options for an "Absolute Magnitude"
or
Precision Rectifier Circuit - FullWaveRectifier.pdf
Message-ID: <bf9a01h17l790bt3ek9p4cj9grjv4c1mkh@4ax.com
...Jim Thompson
|
Thanks Jim. I'll see if it fixes it.
The circuit I used is the one in the SO291 Specification as a
suggested application. Works, except as noted. |
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Clarence_A
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
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"Clarence_A" <no@No.com> wrote in message
news:0Q9Nd.1150$ZZ.392@newssvr23.news.prodigy.net...
| Quote: |
"Jim Thompson" <thegreatone@example.com> wrote in message
news:sk9a01t7qtiusap2kuun3g2t3kbsupbp4l@4ax.com...
On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
See.....
Newsgroups: alt.binaries.schematics.electronic
Subject: S.E.D: Looking for Options for an "Absolute
Magnitude"
or
Precision Rectifier Circuit - FullWaveRectifier.pdf
Message-ID: <bf9a01h17l790bt3ek9p4cj9grjv4c1mkh@4ax.com
...Jim Thompson
Thanks Jim. I'll see if it fixes it.
The circuit I used is the one in the SO291 Specification as a
suggested application. Works, except as noted.
|
Opps! OP291 |
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John Larkin
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
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On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com> wrote:
| Quote: |
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
|
I did a mechanical version once. No matter which direction you turned
the input shaft, the output shaft went clockwise. The MEs were stumped
so I showed them how to do a rotary full-wave rectifier.
| Quote: | I have a working circuit now, but there is some variation between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
|
Can you post your circuit?
John |
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Clarence_A
Guest
|
| Posted:
Sun Feb 06, 2005 4:09 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
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"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX>
wrote in message
news:ltea015gvuthb414lq6kqc1kv806prgjef@4ax.com...
| Quote: | On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I did a mechanical version once. No matter which direction you
turned
the input shaft, the output shaft went clockwise. The MEs were
stumped
so I showed them how to do a rotary full-wave rectifier.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
Can you post your circuit?
|
Sure, But it's easier to post a link!
http://www.analog.com/UploadedFiles/Data_Sheets/813995969OP191_291_491_c.pdf
On page seventeen! |
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John Woodgate
Guest
|
| Posted:
Sun Feb 06, 2005 4:10 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
I read in sci.electronics.design that John Larkin <jjSNIPlarkin@highTHIS
landPLEASEtechnology.XXX> wrote (in <ltea015gvuthb414lq6kqc1kv806prgjef@
4ax.com>) about 'Lookinf for options for an Absolute Magnitude" or
precision rectifier circuit.', on Sat, 5 Feb 2005:
| Quote: | I did a mechanical version once. No matter which direction you turned
the input shaft, the output shaft went clockwise. The MEs were stumped
so I showed them how to do a rotary full-wave rectifier.
|
With ratchet wheels or the spring-loaded orbital idler (which looks like
magic to me)?
--
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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John Larkin
Guest
|
| Posted:
Sun Feb 06, 2005 4:43 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
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On Sat, 05 Feb 2005 22:09:31 GMT, "Clarence_A" <no@No.com> wrote:
| Quote: |
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX
wrote in message
news:ltea015gvuthb414lq6kqc1kv806prgjef@4ax.com...
On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I did a mechanical version once. No matter which direction you
turned
the input shaft, the output shaft went clockwise. The MEs were
stumped
so I showed them how to do a rotary full-wave rectifier.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
Can you post your circuit?
Sure, But it's easier to post a link!
http://www.analog.com/UploadedFiles/Data_Sheets/813995969OP191_291_491_c.pdf
On page seventeen!
|
Crazy! It pulls the opamp input below ground, in violation of their
own abs-max ratings! That 2 volt p-p input must be on the very edge of
blowing the opamp up.
John |
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John Larkin
Guest
|
| Posted:
Sun Feb 06, 2005 4:49 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
On Sat, 5 Feb 2005 22:10:10 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:
| Quote: | I read in sci.electronics.design that John Larkin <jjSNIPlarkin@highTHIS
landPLEASEtechnology.XXX> wrote (in <ltea015gvuthb414lq6kqc1kv806prgjef@
4ax.com>) about 'Lookinf for options for an Absolute Magnitude" or
precision rectifier circuit.', on Sat, 5 Feb 2005:
I did a mechanical version once. No matter which direction you turned
the input shaft, the output shaft went clockwise. The MEs were stumped
so I showed them how to do a rotary full-wave rectifier.
With ratchet wheels or the spring-loaded orbital idler (which looks like
magic to me)?
|
Planetaries and orbitals and differentials are too complicated for me,
too. I used notched pulleys/belts to get counter-rotations and a pair
of one-way roller clutches to rectify them into the output shaft. It
actually drove a synchro for a shaft-rotaton counter on a ship. It was
really silly, since ships spend so little time going backwards you'd
never really miss those turns.
John |
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Clarence_A
Guest
|
| Posted:
Sun Feb 06, 2005 5:17 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX>
wrote in message
news:tqia01pkmc4d8fbtavdrq12jd1sklq3qk5@4ax.com...
| Quote: | On Sat, 05 Feb 2005 22:09:31 GMT, "Clarence_A" <no@No.com
wrote:
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX
wrote in message
news:ltea015gvuthb414lq6kqc1kv806prgjef@4ax.com...
On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be
inherent.
Must be some easy way to eliminate this. Yes?
Can you post your circuit?
Sure, But it's easier to post a link!
http://www.analog.com/UploadedFiles/Data_Sheets/813995969OP191_29
1_491_c.pdf
On page seventeen!
Crazy! It pulls the opamp input below ground, in violation of
their
own abs-max ratings! That 2 volt p-p input must be on the very
edge of
blowing the opamp up.
|
So you see why I wanted a replacement! |
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| Back to top |
|
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John Woodgate
Guest
|
| Posted:
Sun Feb 06, 2005 8:40 am Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
I read in sci.electronics.design that John Larkin <jjSNIPlarkin@highTHIS
landPLEASEtechnology.XXX> wrote (in <f1ja01d165rcirkpdo1o77q4mr793v2iic@
4ax.com>) about 'Lookinf for options for an Absolute Magnitude" or
precision rectifier circuit.', on Sat, 5 Feb 2005:
| Quote: | On Sat, 5 Feb 2005 22:10:10 +0000, John Woodgate
jmw@jmwa.demon.contraspam.yuk> wrote:
I read in sci.electronics.design that John Larkin <jjSNIPlarkin@highTHIS
landPLEASEtechnology.XXX> wrote (in <ltea015gvuthb414lq6kqc1kv806prgjef@
4ax.com>) about 'Lookinf for options for an Absolute Magnitude" or
precision rectifier circuit.', on Sat, 5 Feb 2005:
I did a mechanical version once. No matter which direction you turned
the input shaft, the output shaft went clockwise. The MEs were stumped
so I showed them how to do a rotary full-wave rectifier.
With ratchet wheels or the spring-loaded orbital idler (which looks like
magic to me)?
Planetaries and orbitals and differentials are too complicated for me,
too. I used notched pulleys/belts to get counter-rotations and a pair
of one-way roller clutches to rectify them into the output shaft. It
actually drove a synchro for a shaft-rotaton counter on a ship. It was
really silly, since ships spend so little time going backwards you'd
never really miss those turns.
Your roller clutches are equivalent to ratchet wheels, and diodes. I saw |
the orbital idler solution in a Hong Kong clockwork car. It reversed the
car whenever it wouldn't go further, so it was actually an inverter, but
used the other way round, it's a rectifier. Unfortunately, the kid
wouldn't let me steal it to see in detail how it works. (;-)
--
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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| Back to top |
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Glen Walpert
Guest
|
| Posted:
Sun Feb 06, 2005 7:58 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
On Sat, 05 Feb 2005 14:43:49 -0800, John Larkin
<jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote:
| Quote: | On Sat, 05 Feb 2005 22:09:31 GMT, "Clarence_A" <no@No.com> wrote:
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX
wrote in message
news:ltea015gvuthb414lq6kqc1kv806prgjef@4ax.com...
On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I did a mechanical version once. No matter which direction you
turned
the input shaft, the output shaft went clockwise. The MEs were
stumped
so I showed them how to do a rotary full-wave rectifier.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
Can you post your circuit?
Sure, But it's easier to post a link!
http://www.analog.com/UploadedFiles/Data_Sheets/813995969OP191_291_491_c.pdf
On page seventeen!
Crazy! It pulls the opamp input below ground, in violation of their
own abs-max ratings! That 2 volt p-p input must be on the very edge of
blowing the opamp up.
John
|
Their abs-max input voltage rating of "GND to Vs 10V" is not clear to
me; perhaps they mean you can go outside the PS rails by 10V max, or
perhaps they mean the input is limited to 10V max even if the power
supply is at the specified 16V max? Either way seems more than a
little bit odd to me, if I were using this part I would call my AD FAE
for an interpretation. Data sheet typos are not unheard of.
I would however recommend the more common precision rectifier circuit
using diodes in the feedback loop of an op-amp if better performance
is required. AOE discusses the half wave version in some detail, full
wave is left as an exercise for the student.
Glen |
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Jim Thompson
Guest
|
| Posted:
Sun Feb 06, 2005 9:05 pm Post subject:
Re: Lookinf for options for an Absolute Magnitude" or precis |
|
|
On Sat, 05 Feb 2005 22:09:31 GMT, "Clarence_A" <no@No.com> wrote:
| Quote: |
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX
wrote in message
news:ltea015gvuthb414lq6kqc1kv806prgjef@4ax.com...
On Sat, 05 Feb 2005 19:01:17 GMT, "Clarence_A" <no@No.com
wrote:
Must work over substantial range, say .01 to .6 Volts RMS.
Serious responses only. Please.
I did a mechanical version once. No matter which direction you
turned
the input shaft, the output shaft went clockwise. The MEs were
stumped
so I showed them how to do a rotary full-wave rectifier.
I have a working circuit now, but there is some variation
between
positive and negative half cycles which seems to be inherent.
Must be some easy way to eliminate this. Yes?
Can you post your circuit?
Sure, But it's easier to post a link!
http://www.analog.com/UploadedFiles/Data_Sheets/813995969OP191_291_491_c.pdf
On page seventeen!
|
What a crock! Relies on rail-to-rail OpAmp with negative rail of
first stage tied to ground :-(
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food. |
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