# Need help level shifting and amplifying!!

#### soyboy97

Joined Nov 3, 2019
3
I have an analog signal of 1V peak to peak that sweeps about 0V. The frequency of the signal is between 500 & 1000Hz. I need a circuit that shifts and amplifies the signal to 0.5-2V. The supply is +-10V.

I'm finding it hard finding stuff online to help. If anyone could point me in the right direction with this then it would be much appreciated.

#### MrChips

Joined Oct 2, 2009
31,088
Welcome to AAC!

You can use an op-amp to sum input voltages. You can use either the inverting input or the non-inverting input to add or subtract a DC voltage to implement the desired DC voltage shift.

#### ericgibbs

Joined Jan 29, 2010
19,118
hi 97,
A simple circuit like this would work OK.
What is the source impedance of the Vin signal, also it it assumes the +10V is stable.
E

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#### soyboy97

Joined Nov 3, 2019
3
Welcome to AAC!

You can use an op-amp to sum input voltages. You can use either the inverting input or the non-inverting input to add or subtract a DC voltage to implement the desired DC voltage shift.

View attachment 190516
Hi thanks for you reply. I don't quite understand what you mean. I cant sum the input voltages as i only have 1 input voltage

#### MrChips

Joined Oct 2, 2009
31,088
Sure you can sum.
The other input voltage is your offset voltage.

#### soyboy97

Joined Nov 3, 2019
3
hi 97,
A simple circuit like this would work OK.
What is the source impedance of the Vin signal, also it it assumes the +10V is stable.
E
Hi eric,

I've constructed a circuit similar to the one you sent. My output is a signal from 0-(-2.5). How would i change it to a positive signal from 0.5-2V?

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#### crutschow

Joined Mar 14, 2008
34,843
How would i change it to a positive signal from 0.5-2V?
Reverse the voltage polarity from V2.
It should be positive, not negative.

#### ericgibbs

Joined Jan 29, 2010
19,118
hi,
That circuit you posted has no negative supply , so how can you get 0V to -2.5V.?
E

I see its been noted you have the supply inverted.!!