# Project Help - Design of an op-amp circuit.

#### Ricky Sum

Joined May 6, 2016
13
Hi Everyone I got a project but I dont understand and also where to start with.

DESIGN OF AN OP-AMP CIRCUITS

Given that the pressure sensor produces an output voltage (Vs : sensor output voltage) according to the equation Vs = (P x 0.131 )+ 1.683. This equation can be expressed in
terms of pressure (P) versus sensor voltage (Vs). ie. P = (Vs - 1.683)/0.131 You are to design the amplifier circuit for this sensor using any combination of
inverting amplifiers, non-inverting amplifiers, summing amplifiers together with a 1V
reference voltage source. The two input signals of this circuit are sensor voltage (Vs ) and an 1V reference
source (Vref ) and the circuit should produce an output voltage (Vo) indicating the pressure (psi) according to the equation Vo = P (psi)
i.e When P = 0 psi , Vo = 0V and P = 10 psi, Vo = 10V. P = -10 psi, Vo = -10V.

#### Dodgydave

Joined Jun 22, 2012
9,206
What sensor are you using, which op amps, voltage, pressure range?

Last edited:

#### Ricky Sum

Joined May 6, 2016
13
Last edited by a moderator:

#### dannyf

Joined Sep 13, 2015
2,197
P = (Vs - 1.683)/0.131
It looks like a summer, and a gain stage, at a minimum.

All you need to do is to break that equation into formats that can be handled by a typical opamp block.

#### Ricky Sum

Joined May 6, 2016
13
It looks like a summer, and a gain stage, at a minimum.

All you need to do is to break that equation into formats that can be handled by a typical opamp block.
It looks like a summer, and a gain stage, at a minimum.

All you need to do is to break that equation into formats that can be handled by a typical opamp block.
How can break the equation

#### Alec_t

Joined Sep 17, 2013
11,406

#### AlbertHall

Joined Jun 4, 2014
10,047
This pressure sensor reads down to -10psi? Given that a vacuum is 0psi, how do you get lower pressure than that?

#### wayneh

Joined Sep 9, 2010
16,398
The "g" for gauge in psig is often dropped. Endless confusion versus psia, "a" for absolute.