LED Multiplexing Power Consumption

[rjenkinsgb]

You could also use an external resistor to drop some of the 7v before the 7805.

Or a few rectifier diodes to give a more consistent drop - eg. up to six 1N4000 series diodes or similar.
That should reduce the regulator input to somewhere around 8V on a 12V supply.

 

[ronsimpson]

1N4000

768+ma in a 1a diode. They will be hot to.
Diodes are better than resistors.

 

[JimB]

Or a few rectifier diodes to give a more consistent drop - eg. up to six 1N4000 series diodes or similar.

Or a big chunky stud mounted zener diode on a heatsink.

JimB

 

[Nigel Goodwin]

Or do it 'properly' and use a switch-mode regulator, you can buy tiny adjustable module ones for hardly any money from Banggood etc.

 

[JimB]

Or do it 'properly' and use a switch-mode regulator, you can buy tiny adjustable module ones for hardly any money from Banggood etc.

I agree.
But Suraj has already said (in post#18) :

Here unable to find modern switchmode converters.

Whether he has access to purchase from various internet sources I do not know.

JimB

 

[gophert]

Looks like we will have to jump to a new thread to hear the rest of the story...

https://www.electro-tech-online.com/threads/led-multiplex-current-requirements.156170/

 

[Suraj143]

Looks like we will have to jump to a new thread to hear the rest of the story...

https://www.electro-tech-online.com/threads/led-multiplex-current-requirements.156170/

Oops sorry.This thread belongs to 8x24 design.My new design is 16x48 matrix That is why I started a new thread.

 

[gophert]

Oops sorry.This thread belongs to 8x24 design.My new design is 16x48 matrix That is why I started a new thread.

You should stick with the original thread - or we may need 20 posts again on this thread to agree on what average means in your context.