Would this work?

O

ormo

New Member

• Nov 14, 2008

• #1

Hi,

The circuit I've attached will create a single digit in a display. The circuit is a seven segment display with 2 LEDs making up each segment. The LEDs and resistors finally arrived and I want to make sure that my circuit it correct before I go and solder it all together. Does it look like it would work?

In case the writing hasn't scanned properly the chip is a CMOS 4511 which is a 7-segment common cathode display driver.

 

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O

ormo

New Member

• Nov 14, 2008

• #2

Can anyone tell me if the above would work... I'm itching to get going but I don't want to waste my LEDs and resistors..

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 14, 2008

• #3

Your CD4511 does not have a power supply so it will not work.
If the power supply voltage is only 5V then the minimum output voltage of the CD4511 is only 3.4V and it will not be able to drive two LEDs in series.

 

O

ormo

New Member

• Nov 14, 2008

• #4

Should have mentioned... the 2 wires that lead off in the top right are the power supply wires

 

O

ormo

New Member

• Nov 14, 2008

• #5

What will its output voltage be with a 9v supply?

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 14, 2008

• #6

ormo said:

What will its output voltage be with a 9v supply?

Click to expand...

Don't you have the datasheet for the CD4511?
It shows a max output voltage drop of 1.4V when its supply is 10V and its output current is 20mA. Then its minimum loaded output voltage is about 7.5V with a 9V supply and an output current of 20mA. Its typical loaded output voltage will be about 7.8V with a 9V supply and an output current of 20mA.

 

S

shokjok

Member

• Nov 15, 2008

• #7

I see no errors in the circuit. Ormo has not specified the circuit use or power source.