At roughly $20 tο build, thіѕ 9 digit pulse counteract іѕ аn brilliant example οf home built tools. Thе builder, [Josh] found himself repairing a device аnd іn need οf a pulse counteract. Wіth thе components cheaply available, hе јυѕt built hіѕ οwn. Hе ѕауѕ thаt іt hаѕ a few limitations, lіkе ѕhοw brightness, bυt overall іt seems tο dο thе job well. Yου саn download thе PCB frοm hіѕ site.
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Homeland Security will be at your door shortly.
Oops!
I meant 1 pps (pulse per second) or so!
Pedometers can be found at most Dollar stores.
substitute the pendulum switch for the input pulse,
and you have a real cheap counteract with an LCD show. But it will probably be limited to 1ppsor so.
even simpler with most cheap calculators if you enter 1 , press = then add 1 then press the = button again it increments the count so you can wire just the = button
@Erik,
if you want a hack take a $2.00 calculator and a couple components and make a 9 digit counteract on the cheap.done that back in the 70′s with a high end HP cal.Basically using a transistor to pulse the + and 1 keys.
Maybe I’m not seeing the “hack” here, but most counting ICs have an overflow which can cascade the count into a additional IC…
A few octal line drivers would up the IC component count but might really be cheaper than discrete transistors. Feed the enable line with a variable freq clock and you can dim the show.
yes, but it does it’s job, he acknowledges the flaws, and has solutions if he were to do it again. So congrats to him. I like it
I second using shades on the show, it’ll help a lot!
or drive the led correctly
anyway excellent tool
Simply Sweet. Try putting some shades to the show, maybe negative photo film.