Is there some sort of chip that transforms voltage into decoded 7 segment display?

amando96 · May 30, 2010

Hi, i recently found a printer power supply, gives me 5v, and another rail with 24v, i don't ever use 24v, so i am going to put an LM317 at the 24v output like this.
**broken link removed**

So i can have loads of voltages, the thing is, i would like to be able to measure that voltage without using my multimeter, is there some sort of chip that transforms voltage into decoded 7 segment display?
I only need two displays, voltages won't go over 20v.

thanks

3v0 · May 30, 2010

Maybe what you want is a 7 segment panel meter. They display voltage directly. The circuit you want is included with the display.

amando96 · May 30, 2010

Those are a bit pricey, not available locally.

What about voltage to binary, and then a binary to 7 segment display?

ericgibbs · May 30, 2010

amando96 said:
Those are a bit pricey, not available locally.

What about voltage to binary, and then a binary to 7 segment display?

If you want to build your own, look at the ICL 7106 or 7107 datasheets.

3v0 · May 30, 2010

I do not know what you budget is but futurlec has a 0 to 20V panel meter XL3-20V for about $9US.

The down side is that they take about 2 weeks to a month to deliver.

amando96 · May 30, 2010

Thanks eric, seems like that will be it, can't say no to a free chip.

I try my best not to buy from the US, because of customs.

crutschow · May 30, 2010

3v0 said:
I do not know what you budget is but futurlec has a 0 to 20V panel meter XL3-20V for about $9US.

The down side is that they take about 2 weeks to a month to deliver.

I bought one and it arrived in about a week. It does require 12V for power (minimum about 8V), and the power and measured voltage can share a common ground. Some digital panel meters (as well as the ICL7106 and ICL7107) require a separate supply.

amando96 · May 30, 2010

It only consumes 20-25mA so i would use the 5v rail to power it, and measure the adjustable rail.

Is there some sort of chip that transforms voltage into decoded 7 segment display?

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Is there some sort of chip that transforms voltage into decoded 7 segment display?

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