Op-amp circuit help

On Feb 16, 1:45 pm, John Fields <jfie...@austininstruments.com> wrote:

On Fri, 15 Feb 2008 12:12:11 -0800 (PST), reginald.lo...@gmail.com
wrote:

Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?

---
View in Courier:

+V>------+------------------+
| |
| +---|--[R]--+
VIN>----|+\ | | |
| >----+--[R]--+--|-\ |
+--|-/ | | >-----+--->VOUT2
| | | +5V>---|+/
+---|-[R]--+-----------|----------->VOUT1
| | |
[R] | |
| | |
GND>-+---+------------------+

--
JF

Thanks

 

On Feb 15, 4:42 pm, "Richard Seriani" <richard_s...@cox.net> wrote:

reginald.lo...@gmail.com> wrote in message

news:ceb26ddd-7612-44f3-9a81-a2fd43bc99cd@d21g2000prf.googlegroups.com...> Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?

Since you are apparently aware you need a NON-INVERTING op-amp configuration
for Vi to Vo1 and that Vo2 is the INVERSE of Vo1, what type of op-amp
configuration so you suppose you need from Vo1 to Vo2?
Take another look at your textbook.

What's your point??? Can't you answer the question or shutup!?!

 

[John Fields]

On Fri, 15 Feb 2008 12:12:11 -0800 (PST), reginald.louis@gmail.com
wrote:

Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?

---
View in Courier:


+V>------+------------------+
| |
| +---|--[R]--+
VIN>----|+\ | | |
| >----+--[R]--+--|-\ |
+--|-/ | | >-----+--->VOUT2
| | | +5V>---|+/
+---|-[R]--+-----------|----------->VOUT1
| | |
[R] | |
| | |
GND>-+---+------------------+

--
JF

 

[John Popelish]

reginald.louis@gmail.com wrote:

Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?

Take a look at V01 where it is equal to V02. That pivot
point is the voltage you must connect to the non inverting
input of the second stage if it is driven by V01 and has an
inverting gain of -1.

Or, if you want to drive the second stage directly with Vi,
you have to find the Vi voltage that equals Vo2 (where Vi
and V02 cross each other) to find the pivot voltage to
connect to the non inverting input with an inverting gain of
-2.

--
Regards,

John Popelish

 

[JeffM]

reginald.louis@ gmail.com wrote:

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

http://www.google.com/search?q=op-amp+offset+summing
Think "instantaneous".
http://www.google.com/search?q=define:summing+amplifier
Your textbook should cover this.

 

[Richard Seriani]

<reginald.louis@gmail.com> wrote in message
news:ceb26ddd-7612-44f3-9a81-a2fd43bc99cd@d21g2000prf.googlegroups.com...

Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?

Since you are apparently aware you need a NON-INVERTING op-amp configuration

for Vi to Vo1 and that Vo2 is the INVERSE of Vo1, what type of op-amp
configuration so you suppose you need from Vo1 to Vo2?
Take another look at your textbook.

 

Hi everyone. I have a simple need, but don't know how to do it.

Let's call the input signal Vi and the 1st output Vo1 and 2nd output
Vo2. Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Vi swing from 0V to 5V
Vo1 must swing from 0V to 10V
Vo2 must swing from 10V to 0V (so Vo2 is the *inverse* of Vo1)

The circuit for V1 -> Vo1 is a simple non-inverting op-amp with a gain
of 2. But I don't know how to made the circuit for Vi -> Vo2

Any idea?