Binary Clock

[Glicer]

Hi.

Anybody knows a working binary clock schematics, to assemble it by my
self ?

something like the one at thinkgeek but i want to have one done by me
to put it on a chasis.

I surfered over the net but no good schematics.
All internet is full of broken links or redirect to some comercial
stuff.

 

[Peter de Vroomen]

Anybody knows a working binary clock schematics, to assemble it by my

self ?

Nope, but there are generally two ways to do it.

1. Use a microcontroller. But there's 20 led's in there, and not much
microcontrollers have 20 outputs. You could multiplex the outputs. If you
multiplex fast enough, the led's won't blink.
2. Make it discrete with a 1Hz oscillator and some counters and special
reset-circuitry. You could make it with six 4-bit counters (74LSxx series)
and some AND's and OR's for the reset circuitry.

I don't have any schematics, but making a clock using standard 74LSxx logic
is pretty basic . But it will be a lot of soldering.

A microcontroller is probably more versatile, you could add alarms and
whatever. And if you use i.e. a 8051, you would probably only need the
necessary discreet components and a 4-bit latch.

Maybe I'll slap something together, but don't expect it today .

PeterV

 

[tim da man]

Took me 30 sec to find these 2 schematics

http://tinyurl.com/2sgnz

http://tinyurl.com/2du9