markcalaway
Newbie level 4
![Newbie level 4](/styles/images/ranks/blevel1.gif)
understand ic ca3130 application
Hi. I am facing some problems in using an opamp. I hope someone can help me out here.
Basically, I am supposed to create a variable voltage regulator with these criteria.
1) Supply voltage of OpAmp needs to be a single supply voltage. ( Eg +Vcc = 10v, -Vcc = Gnd)
2) Input Voltage at the inverting input = 0 to 10v
3) Output Voltage = 0 to 5v
So basically whatever the input voltage is, the output voltage should be half of that. I thought the circuit below would be a perfect solution to this. But the problem is whenever I connected my circuit on the breadboard like so, the output voltage always give me erratic readings commonly around 0.6 - 0.8v. I have checked my circuit connection several times before and I am not really sure what is the problem. As for the Opamp, I am using ic LM 358N. I have also tried LM 258N. Both are dual low power opamps and they are supposedly powered by a single power supply. Could someone tell me where I could be possibly going wrong here or am I even using the right chip ??? Below is the link to the circuit diagram. Thanks to anyone who helps out.
**broken link removed**
Hi. I am facing some problems in using an opamp. I hope someone can help me out here.
Basically, I am supposed to create a variable voltage regulator with these criteria.
1) Supply voltage of OpAmp needs to be a single supply voltage. ( Eg +Vcc = 10v, -Vcc = Gnd)
2) Input Voltage at the inverting input = 0 to 10v
3) Output Voltage = 0 to 5v
So basically whatever the input voltage is, the output voltage should be half of that. I thought the circuit below would be a perfect solution to this. But the problem is whenever I connected my circuit on the breadboard like so, the output voltage always give me erratic readings commonly around 0.6 - 0.8v. I have checked my circuit connection several times before and I am not really sure what is the problem. As for the Opamp, I am using ic LM 358N. I have also tried LM 258N. Both are dual low power opamps and they are supposedly powered by a single power supply. Could someone tell me where I could be possibly going wrong here or am I even using the right chip ??? Below is the link to the circuit diagram. Thanks to anyone who helps out.
**broken link removed**