touch 34 Posted March 17, 2011 Share Posted March 17, 2011 Hi all, I picked up some CD74HC4511 binary to decimal converters to use with my 7 segment displays, however I'm having some issues with them. The problem I'm having is some decimals fail to fully display, for example: I'm sending 0100 (d3 low, d2 high, d1 low, d1 low), that should display a 4, however the G segment on my display is not lighting up, when probing the G LED's pin I'm getting 1.8v, I'm also getting 1.8v when I probe the F pin, pins D and E are 0v as expected, pins F, B and C are 3.5v as expected. Similar things are happening when trying to display the decimal 6, all have their expected voltages, accept the G segment whitch is reading 1.8v. I'm really stumped as to what is causing some numbers to not properly display and the random voltages. Heres the datasheet: http://focus.ti.com/lit/ds/symlink/cd74hc4511.pdf Here is the circuit I've been using for testing: http://hs.doversherborn.org/hs/bridgerj ... addLED.htm The only minor differences I have are that I'm using 5k resistors (out of 10k's, but according to my googleing, 5k's should be fine), and a single resistor on the cathode but that should only cause uneven display brightness. Quote Link to post Share on other sites
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