Electronic Circuits and Projects Forum

Hi Bill,

But I want to display hexadecimal and will they work for 12 months from a 9v battery?
Can you post the driver code, preferably written in Cobol and I need it by tomorrow

Eric

Originally Posted by audioguru

Hi Eric,
LEDs use a lot of power.
A little PP3 9V alkaline battery has a very low amount of power and can light a single LED at 27mA for only about 32 hours, dimming all the time. After only 6 hours the 9V battery voltage is only 7V. After 20 hours the voltage is 6.2V and at 32 hours the voltage is 4V.

One year has 8760 hours. A little PP3 alkaline battery can supply only 0.1mA for one year.
An LED hex display with an average of 12 segments lighted at 10mA each uses 120mA.

Use an LCD display. It uses a very low amount of power if it is not lighted.

hi agu,
Thank you for taking the time to respond.

I must apologise to you, I was making a joke reply for Bill's OP.
Its back fired on me

I owe you one!

Regards
Eric

Originally Posted by blueroomelectronics

It's an old CM-5 from thinking machines. Thousands of LEDs for the thousands of tiny microprocessors. Blinking and flashing.

Hello Dear Sirs,

Thank you and congradulations on your postings of many leds project. I am current graduating training at university and needing assist with final project. I wish to create many leds but free power from sun with wireless gsm. Please help, I need to submit proposal by this end of month.

my email is sungradu@hotmails.com

thanks you!

just some humor guys, no need to reply

Originally Posted by blueroomelectronics

No soup for you.

hi Bill,
Never mind the soup, I've just eaten 'crow' for audioguru!

Eric