DIGITAL DARKROOM TIMER KIT - $28

A digital timer for $28!

What's the catch? You have to put it together yourself and
you have to supply a few items you most likely already have.

Timer features:

o 2 digit .57" LED display

o 0.1 to 990 second (16 1/2 minutes) timing range

o Real keyboard switches, unlike the *&#?! switches on some
$200 timers I know of

o 10A relay contacts, rated for 300W incandescent loads.
Arc suppression makes it suitable for use with cold light heads.

o Small size, frees up valuable space on the baseboard.
The timer can be constructed in two units: a small, light
3x5x1 inch control box and a separate under-counter box
with the relay, power supply and plugs. No more power cords
running around the baseboard. The index card sized
control box can even be wall mounted with Velcro.

The kit contains all the electronic parts: programmed uP,
resistors, capacitors, switches, relay. Included are
assembly and operation instructions, schematics and
2x and 1x artworks for those who etch their own circuit
boards.

This timer kit is designed to produce the most bang for the
buck. To that end, you supply the following parts that you
most likely already have in your junk box (or Radio Shack,
if you are junk poor):

o A box
o A wall-wart power block: 5V DC or anything above 7.5V AC/DC
o A circuit board: 2x4 inch printed circuit or wire-wrapped perf-board
o A duplex power outlet, line cord, on-off switch
o Wire, screws, solder ....

I am doing it this way because I believe these items are
redundant for a majority of buyers -- why buy what
you don't need?

The electronics kit costs $28 + postage

A printed circuit board with additional connectors, wiring harness
and a machined socket for uP: $12 (+ postage if ordered separately)

Postage in the US is $2.00.

Please email me for more details.

Thank you very much for your time...

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.

Do you have any pictures of a built unit say on the web. Some description
of how it works. You must use a slide switch to select 10x 1x and .1x for
the display to get a range of 990 seconds with a two segment display. More
detail would be helpful. It sounds very interesting.

"Nicholas O. Lindan" wrote in message
...
A digital timer for $28!

What's the catch? You have to put it together yourself and
you have to supply a few items you most likely already have.

Timer features:

o 2 digit .57" LED display

o 0.1 to 990 second (16 1/2 minutes) timing range

o Real keyboard switches, unlike the *&#?! switches on some
$200 timers I know of

o 10A relay contacts, rated for 300W incandescent loads.
Arc suppression makes it suitable for use with cold light heads.

o Small size, frees up valuable space on the baseboard.
The timer can be constructed in two units: a small, light
3x5x1 inch control box and a separate under-counter box
with the relay, power supply and plugs. No more power cords
running around the baseboard. The index card sized
control box can even be wall mounted with Velcro.

The kit contains all the electronic parts: programmed uP,
resistors, capacitors, switches, relay. Included are
assembly and operation instructions, schematics and
2x and 1x artworks for those who etch their own circuit
boards.

This timer kit is designed to produce the most bang for the
buck. To that end, you supply the following parts that you
most likely already have in your junk box (or Radio Shack,
if you are junk poor):

o A box
o A wall-wart power block: 5V DC or anything above 7.5V AC/DC
o A circuit board: 2x4 inch printed circuit or wire-wrapped perf-board
o A duplex power outlet, line cord, on-off switch
o Wire, screws, solder ....

I am doing it this way because I believe these items are
redundant for a majority of buyers -- why buy what
you don't need?

The electronics kit costs $28 + postage

A printed circuit board with additional connectors, wiring harness
and a machined socket for uP: $12 (+ postage if ordered separately)

Postage in the US is $2.00.

Please email me for more details.

Thank you very much for your time...

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.