hello again,, how hard would it be to make the volt/amp guage of my psu a digital display in stead of analog? its a variable supply with a pot. knob not a switch so when rolling up the voltage the display would have to roll with it?

 

figured I would add a picture of my psu...

 

probably simple..
If the analog meter is full scale (so if Vin to meter = Vout) then just buy a digital meter and hook it up to it.... Note you will need a constant voltage for the power supply of the digital meter too..

 

Yes, when I built mine many moons ago, I used a couple of Red Lion panel meters, one for Volts one for Current.
http://www.redlion.net/Products/DigitalandAnalog/DigitalPanelMeters.html
Max.

 

so that's it? the digital meter hooks right up to the same wires that the analog one uses? I just figured there would be something tricky about it..

 

We can make it tricky if you prefer.

The Red Lion PDF give you an idea what is needed, there are various models with varying complexity.
Max.

 

Digital panel meters are not cheap. Shop around.
Or roll your own.

 

Check this out:

http://www.futurlec.com/Panel_Meters.shtml

 

hello again,, how hard would it be to make the volt/amp guage of my psu a digital display in stead of analog? its a variable supply with a pot. knob not a switch so when rolling up the voltage the display would have to roll with it?

Easy. We used to get self contained dig displays where the full scale was selectable as either 200 mV or 2V.

 

Be careful... A lot of the inexpensive DPMs cannot share a common connection between their own power pins and the negative of the voltage they are measuring... The more expensive ones usually can...

 

I think I would like to build my own using 7 segment led displays.. I feel I could a lot from a project like that.. so where do I start?

 

You can using ICL7107 for LED, and it's easy to change when the LED was damaged.

 

You can using ICL7107 for LED, and it's easy to change when the LED was damaged.

I was just reading on that ic... it seems amazing that it does everything that's needed and then some.. I wonder if its available at the local esco?

 

I was just reading on that ic... it seems amazing that it does everything that's needed and then some.. I wonder if its available at the local esco?

Here is the 7107 LED sample.