How to connect hidden pin to a node by using Proteus

[foong]

I going to design DAC by using DAC0808 with bipolar configuration. So I gonna connect pin 2 (ground pin) to ground and positive terminal of Op-amp. However, pin2(ground pin) of DAC0808 is always hidden, how can I connect that pin to a node? If anybody can help?

 

[Nigel Goodwin]

Why not read the 'similar thread' below where it's already been answered?.

 

[Ian Rogers]

Not sure how that would work... Pin 2 of the DAC would be connected to ground via a 5k resistor ?? Also your Vref- and + cannot work like that.
It will read 0v and 5v.. What are you expecting at the output?? Looking at the datasheet, you are trying to make a virtual ground..

 

[Ian Rogers]

Is this what you are trying to achieve..

 

[foong]

I am using Proteus to build this circuit. This is the circuit I try to build but unfortunately pin 2 is always connected to ground when using Proteus, I can't connect pin 2 to anyway.

 

[foong]

Is this what you are trying to achieve..

View attachment 130568

Is this what you are trying to achieve..

View attachment 130568

Yes, this is the circuit I need to build

 

[Nigel Goodwin]

I am using Proteus to build this circuit. This is the circuit I try to build but unfortunately pin 2 is always connected to ground when using Proteus, I can't connect pin 2 to anyway.

Pin 2 is ground, so should be connected to ground - why are you not wanting to do that?.

 

[foong]

Pin 2 is ground, so should be connected to ground - why are you not wanting to do that?.

I want to connect pin 2 to op-amp as well

 

[foong]

This is the thing I need to build by using Proteus, its connect to ground and pin 2 at the same time.

 

[Nigel Goodwin]

View attachment 130619
This is the thing I need to build by using Proteus, its connect to ground and pin 2 at the same time.

Using Proteus isn't 'building it', it's just playing computer games - if you want to build it - then BUILD IT and see if it works.

 

[foong]

Using Proteus isn't 'building it', it's just playing computer games - if you want to build it - then BUILD IT and see if it works.

Sry, maybe I should not use the word 'build' , should use 'simulate' instead .I know how to build it physically and done it before. However it is a Proteus simulation coursework which we need to compare actual result from actual "circuit build" and simulation result by using "Proteus". Thanks for your time and advice.