Here is my IV-9 based
Numitron clock. It has an alarm with a snooze button.
The Decimal point
on the left is the PM indicator and the decimal
point on the right
is the alarm on indicator.
This clock uses the
S1998 direct drive clock IC that can drive LED's directly
but to drive numitrons
I used ULN2002's to handle the extra current. You
can see the buzzer
on the left which can wake up the dead!
As with all my clocks,
I prefer point to point wiring. Sorry about
the blurry picture.
The clock almost
completed. I used a 12vct transformer but used the
center tap to feed
the LM317 adjustable regulator which is cool to the touch.
I bought this retro
1970's enclosure in a radio swap meet which housed some
kind of RF amplifer.
Unfortunitely there were holes drilled in the front and back
so I utilized them
for my switches and cut around them for the display.
Nice rounded edges.
I added a transparent red
plexiglass to the front. This
picture does not
do justice as the color is a deeper red
than shown.
The back showing
the switches. The upper left is the snooze button, the upper right
is to set the alarm.
The toggle switch is to turn on the alarm and the other 2 are
the slow and
fast set switches. I know... I used an orange line cord, what can
I say, I have 100
of them...
updated 04/01/2006