supply with enough
head space to let the
op-amp be comfortable
and stay linear. Since
no negative voltages
are used, the negative
supply only needs to be
low enough to give
clearance and can be
any voltage lower than
about -1.5V. You may
want to use a second
op-amp from a dual
package as an output
buffer (voltage follower), depending on the intended load. You can change V or R
or both to change the range. Changing VRef changes both the
span and the range. Use the offset adjust (R3) to make the
output 10V when X is zero. Since there are tens of thousands
of op-amps to choose from, it is probably best to look to
your favorite store, see what they have, and consult the
spec sheets. For increased accuracy, you could choose an
instrumentation op-amp. The bandwidth is probably irrelevant
depending on just what the resistance source is and how fast
it changes.
Figure 1
Jim Brannan
Santa Clara, CA
AMATEUR RADIO AND TV
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Cana Kit Corp. ........................................ 63
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& Enclosures
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provided material
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FrontPanelExpress.com
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Digilent .................................................... 19
Fun Gizmos ............................................. 27
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Lemos International Co., Inc. .................. 27
Lynxmotion, Inc. ...................................... 49
Pololu Robotics & Electronics .................. 43
Robot Power ........................................... 27
Solarbotics/HVW ....................................... 9
Twin Peaks Robotics................................ 27
SATELLITE
Lemos International Co., Inc. .................. 27
TEST EQUIPMENT
Bitscope .................................................... 4
Circuit Specialists, Inc. ....................... 82-83
Dimension Engineering .............................. 9
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Jaycar Electronics .................................... 57
McGills Warehouse .................................. 50
NKC Electronics ...................................... 27
Poscope ................................................... 18
Saelig Company Inc. ............................... 33
TOOLS
MikroElektronika ........................................ 3
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Poscope ................................................... 18
WIRELESS PRODUCTS
Twin Peaks Robotics ................................. 2
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All Electronics Corp. ............................. 81
AP Circuits ............................................ 33
BaneBots ................................................ 8
Bitscope .................................................. 4
Blue Wolf................................................ 25
Cana Kit Corp. ...................................... 63
Chipino .................................................. 27
Circuit Specialists, Inc. .................... 82-83
Command Productions ......................... 25
Cunard Associates ................................ 27
Digilent .................................................. 19
Dimension Engineering............................ 9
Electronix Express ................................ 13
ExpressPCB .......................................... 55
Front Panel Express LLC .....................79
Fun Gizmos .......................................... 27
Global Specialties ................................... 7
GSS Tech Ed ........................................ 50
I2I Controls.............................................. 51
Integrated Ideas & Tech. ....................... 41
Jaycar Electronics.................................. 57
Lemos International Co., Inc. ................ 27
Lynxmotion, Inc. .................................... 49
McGills Warehouse................................ 50
microEngineering Labs ............................ 5
MikroElektronika ..................................... 3
NetBurner ................................................ 2
NKC Electronics .................................... 27
Noritake ................................................. 32
PAiA ...................................................... 33
PanaVise ............................................... 13
Parallax, Inc. ..........................Back Cover
PCB Pool .............................................. 75
Pololu Robotics & Electronics................ 43
Poscope ................................................. 18
QKI TS .................................................... 27
Ramsey Electronics, Inc. ................. 20-21
Robot Power ......................................... 27
Saelig Company Inc. ............................. 33
Solarbotics/HVW ..................................... 9
Twin Peaks Robotics ............................. 27
V-Module ............................................... 42
Weirdstuff Warehouse ........................... 27
September 2011
79