rob1310
Newbie level 2
![Newbie level 2](/styles/images/ranks/alevel2.gif)
Hello..
I am trying to build an Amp crcuit for an input voltage range between 28mV-59mV from a transducer.
I am using the LM324 amp for this purpose. I built the circuit on a PCB later on to bang into a few problems. SO now i am trying to understand the op-amp and itfunctions.
I built a basic amp circuit
Rf = 1000 Ohm;
R1 = 33 Ohm
input is given too 2nd pin of lm324 which has to result in a negative ouput
but the output obtained is show in this link below..
![](https://obrazki.elektroda.pl/65_1257146186_thumb.jpg)
the circuit is show as
![](https://obrazki.elektroda.pl/23_1257146306_thumb.jpg)
Can you please send me ur feedback as to what basic connections have to be done on a LM324..
Why am i not getting a negative voltage output which is designed according to the GAIN.. Av = - Rf / R1..
Added after 17 minutes:
Voltage suply for OP-AMP = 9v
Input voltage to pin 0.15V at pin no 2 .. the inverting input pin of LM324//
I am trying to build an Amp crcuit for an input voltage range between 28mV-59mV from a transducer.
I am using the LM324 amp for this purpose. I built the circuit on a PCB later on to bang into a few problems. SO now i am trying to understand the op-amp and itfunctions.
I built a basic amp circuit
Rf = 1000 Ohm;
R1 = 33 Ohm
input is given too 2nd pin of lm324 which has to result in a negative ouput
but the output obtained is show in this link below..
![](https://obrazki.elektroda.pl/65_1257146186_thumb.jpg)
the circuit is show as
![](https://obrazki.elektroda.pl/23_1257146306_thumb.jpg)
Can you please send me ur feedback as to what basic connections have to be done on a LM324..
Why am i not getting a negative voltage output which is designed according to the GAIN.. Av = - Rf / R1..
Added after 17 minutes:
Voltage suply for OP-AMP = 9v
Input voltage to pin 0.15V at pin no 2 .. the inverting input pin of LM324//