Electronics > Beginners

Making an analog bar graph voltmeter 1-10V using 10 LEDs

<< < (3/3)

StuartA:
The Velleman company make a kit for an audio VU meter using LED's and dicrete componenets, see http://www.velleman.co.uk/contents/en-uk/p41.html The manual for it shows the circuit diagram (which is probably copyright, so not shown here). That might form the basis for what you want. I have built that kit and it works well.

S

mikerj:

--- Quote from: blueskull on July 09, 2019, 04:31:06 am ---Nowadays the cheapest way would be to use a cheap MCU (with an IO-based dual slope ADC, no hardware ADC/DAC/COMP/PWM needed) to implement LM3914.

--- End quote ---

As much as I feel a little sad (or maybe just nostalgic) that small micros have replaced so many functions these days I have to agree, even micros with built in 8-10bit ADC are very cheap.  This also gives the options of features such as peak hold, custom scaling etc.

ledtester:
In the January 1980 issue of Popular Electronics Forrest Mims describes how he used a simple chain of LEDs to get a bar graph display of a voltage.

See pp 77-80 (starting on page 73 in the PDF) in:

https://www.americanradiohistory.com/Archive-Poptronics/80s/1980/Poptronics-1980-01.pdf

Update: The article mentions a "Gregory Kovacs, a student at Eric Hamber Secondary School in Vancouver, British Columbia" who built a oscilloscope based on the ideas in the article and it even had  a storage capability. A quick google search reveals the person is most likely this Professor Emeritus at Stanford:

https://engineering.stanford.edu/people/gregory-kovacs

shanezampire:
Is that the same thing as something like - https://www.vellemanusa.com/products/view/?country=us&lang=enu&id=350546

The leds light as more power is given























Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod