Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

please help me using instrumentation amplifier

Status
Not open for further replies.
W

waqas5304

Member level 1
Joined
Sep 9, 2006
Messages
41
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,286
Activity points
1,616
using instrumentation amplifier circuit

Hi
i am new to this forum this is my first mail.
i am using a instrumentation amplifier using 03 TL074 opamp IC.i am able to operate it with dual supply but when i convert it to single supply it is not working.i have consulted many books and curcuits and but i am stuk.
i hope someone can send me a good pair of advice.i will be gratefull if someone sent me a circuit diagram of single suypply instrum,entation amplifier.
 

tl084 instrumentation amplifier

You have to reference the (+) input of the third amplifier not to 0V but to 1/2Vcc (virtual ground) ..

See (the same issue):



Regards,
IanP
 

instrumentation amp with virtual ground

thanks for reply
i have done it i have tied the third Opamp to 1/2Vcc.but still it is not working.i am unable to understand the problem.is TL074 the problem.please help
 

why use instrumentation amplifier tl074

Post your circuit diagram .. it may be helpful ..

Regards,
IanP
 

using differential amplifier for microphones

ok
here is my circuit i am using this as a pre amplifier for low impedance microphone.i am giving balanced input and getting single ended otput from third amplifier.i have drawn the schematic in EWB.+ve of opamp is conected to VCC whereas i have placed a voltage divider on non inverting input of third opAmp.voltage divider gives Vcc/2. on end of voltage divider is connected to Vcc and other to ground.but this is not working i am having DC on ouput only .this circuit works prefectly fine with dual supply. i am giving 18 Volt as VCC.
93_1164006416.JPG
 

simple dc amp using tl074

This circuit will not work correctly as the reference voltage must have very low output impedance ..
Use the forth opam of the TL084 to generate 1/2Vcc virtual ground .. see picture below .. 1kΩ resistor not required ..
Note that the final output voltage must be measured with respect to the 1/2Vcc (new GND) reference, and not to 0V (old GND) ..

Regards,
IanP
 

tl084 preamplifier -datasheet schematic

thanx alot
i am trying this confrifuation.i hope it will work i will come back to you after trying it

Added after 24 minutes:

i have tried this but of no use.even after this the output is not there.i have tried everything but its not working.well once i got the ouput but it was a square wave.my input is a sine wave.but after that no output.i have connected the output ur circuit to resistor of OPAMP no 3.

Added after 29 minutes:

its not working when i measure the output with respect to virtual gnd there is not output.but when i measure output with respect to Vin low its there but very noisy.moreover when i connect the microphone there is no output
well thanx
i think i should work for some alternative.if anyone has please suggest
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top