I'm in need of a simple amplifier to be used as a conditioning circuit for a sensor signal, with an adjustable gain setting to change the ramp characteristics.

Basically, I need to change the ramp time for a variable 0 to 5v signal. For example:



The simpler, the better. I'm thinking an AD620 module, something like this would work... if I can power with 12v but clamp the output to sensor high (5v).

Thoughts?

 

Does this cause a tingle in your Spidey senses?

 

Does this cause a tingle in your Spidey senses?

It might. Need to do some 'sperementin

 

It might. Need to do some 'sperementin

It mostly depends on finding a rail-to-rail I.O. op-amp. Something in the LMC6000 series IIRC.

 

I would prefer a prebuilt amp module, but if I have to breadboard something and then build a PCB, it is what it is

 

I would prefer a prebuilt amp module, but if I have to breadboard something and then build a PCB, it is what it is

It's true you can get amazing pre-built boards for $10...but you asked for simple, and I can do that.

 

now that I think about it, I could just power it with the 5v power feed to the sensor....as long as it doesn't draw much current. That should automatically limit the output to the 5v rail...right?

 

now that I think about it, I could just power it with the 5v power feed to the sensor....as long as it doesn't draw much current. That should automatically limit the output to the 5v rail...right?

That's a possibility. If the 5V rail is just a voltage regulator you're home free. Right now, I'm fighting a Ford Explorer which seems to have one wire can-bus responders in the seat belt buckles.

You could also move the 5.1 VZ to the supply line for the op-amp. That would limit the output voltage and help protect the amp from voltage transients in the electrical system.