Buffer with LF353

[welllll]

Hello Electro Tech users. I am an electronic student and i'd like to create a simple buffer with the LF353 opamp. My schematics is attached in this post. Could you please tell me why is this happening?

Cumps,
Well

 

[ericgibbs]

hi,
The LF353 is not really suited to single supply operation, especially at such a low supply voltage.
The output of the LF353 will limit at approx 1.5V to 2V less than the supply.

You need to get an OPA thats designed to work from a single low supply and has a rail to rail output range. eg: MCP6002

 

[Ian Rogers]

Place a small value resistor from the output to ground (there has to be current flowing )

 

[welllll]

Ian i tried that scheme and it doesn't work =/. Output is always equal to 0.7 V.

 

[ericgibbs]

Ian i tried that scheme and it doesn't work =/. Output is always equal to 0.7 V.

With a low single supply voltage the output will not go lower than approx 0.7V or higher than about 1.5V

The amplifier type is NOT suitable for that application.

 

[welllll]

Thank you ericgibbs. I dont have a rail-to-rail output opamp with single suply but i've already ordered that MCP6002 from microchip =)