#### Vizier87

##### Active Member

Here's my schematic:

https://www.electro-tech-online.com/attachments/amp-jpg.34774/

so the gain is 1+ (R1/R2), and R1=50 K trimpot, and R2 is a 10K carbon resistor.

Problems:

1. The LM35 heats up easily, so do I need to put a resistor in series into Vin?

2. The amplification didn't work! What's the problem? I've seen numerous schematics from the net, but I don't know which one should be used, so I chose this one for starters. So we can work a way slowly from here.

I use LM358 for the op amps.

Cheers.

https://www.electro-tech-online.com/attachments/amp-jpg.34774/

so the gain is 1+ (R1/R2), and R1=50 K trimpot, and R2 is a 10K carbon resistor.

Problems:

1. The LM35 heats up easily, so do I need to put a resistor in series into Vin?

2. The amplification didn't work! What's the problem? I've seen numerous schematics from the net, but I don't know which one should be used, so I chose this one for starters. So we can work a way slowly from here.

I use LM358 for the op amps.

Cheers.