seven segment help - Electronic Circuits Projects Diagrams Free

jokira247 · 6th May 2009, 04:36 PM

i don't know what resistors or voltage to use with this seven segment
::Compre Componentes Eletrônicos Baratos no www.Soldafria.com.br

no details is provided with it and i can't find any data sheet
can anyone help me find it?

on the display written

pa6 wlg and d23012a/b(e)

crutschow · 6th May 2009, 04:54 PM

I would try adding a resistor (say 500Ω) in series with one of the segments and slowly increase the voltage until you get the desired brightness. Then measure the voltage across the resistor and calculate the current (or connect an ammeter in series with the resistor to find the current). I expect it will be somewhere around 10-20mA. From that you can calculate the required resistor value for the voltage supply you have.

If you go too high in current the brightness will seem to stop increasing with current. At that point you would be overdriving the LED.

hakha4 · 1st September 2009, 03:40 PM

Hi!
Maybe this info is of no use since it's a long time question was raised but I've bought same 7 seg displays on ebay and here are some info
Common Cathode
Size: 2.3'' (69.70mm*47.80mm*12mm)
Forward Voltage: 7.5V
Forward Current: 5-10mA

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6th May 2009, 04:36 PM	#1
jokira247	seven segment help i don't know what resistors or voltage to use with this seven segment ::Compre Componentes Eletrônicos Baratos no www.Soldafria.com.br no details is provided with it and i can't find any data sheet can anyone help me find it? on the display written pa6 wlg and d23012a/b(e)

6th May 2009, 04:54 PM	#2
crutschow	I would try adding a resistor (say 500Ω) in series with one of the segments and slowly increase the voltage until you get the desired brightness. Then measure the voltage across the resistor and calculate the current (or connect an ammeter in series with the resistor to find the current). I expect it will be somewhere around 10-20mA. From that you can calculate the required resistor value for the voltage supply you have. If you go too high in current the brightness will seem to stop increasing with current. At that point you would be overdriving the LED. __________________ Carl Curmudgeon Elektroniker

1st September 2009, 03:40 PM	#3
hakha4	Hi! Maybe this info is of no use since it's a long time question was raised but I've bought same 7 seg displays on ebay and here are some info Common Cathode Size: 2.3'' (69.70mm47.80mm12mm) Forward Voltage: 7.5V Forward Current: 5-10mA