The Tach jr.
A microprocessor controlled, low cost, 4 digit LED
tachometer that
will read
from 15 rpms to 90,000 rpms. It
fits
inside a Serpac ( Mouser IR case # 635-M-6B).
Because of its small size, any case will work fine. (We advise using a dark case
for this instrument.)
The Tach jr. in a RS case. Don't
be
misled by the picture, the read out
is crystal clear, sharp and easy
to
read.
To keep the cost down there is no
turns counter option like the Tach Plus.
However, the Tach jr. is a very
high quality, accurate instrument with every part
chosen for optimum performance
just like the Tach Plus and like the Tach plus it
reads a reflective strip off a
rotating shaft from a distance of 4 to 8 inches.
It runs from two AA Alkaline
batteries or a 4.5 to 6 volt wall transformer.
It will work with the remote too!
How accurate is the Tach jr.? We used NIST instruments to
calibrate it with
less than 4 rpms error in 10,000. You can expect the same
accuracy even if
you build the kit yourself with little experience.
The finished Tach jr. (batteries are not included)
The introductory price will be
a low $39.95 plus
shipping.
Tach jr. full kit
(contains all parts to
build a working Tach jr.
but no case or batteries)
Complete with detailed
instructions, a schematic
and parts overlay drawing
$39.95
(see the ORDER page for other Tach jr. parts and prices
*** NEW *** TJ option is now in. Fits on your board and lets you
run a 50 or more foot wire to
the optical sensor OR Hall (magnetic)
sensor. You get all the hard
to find parts, one sensor/emitter pair, one
hall sensor plus the remote
jack (J1 on the TJ board) and a 1k resistor.
(Requires a standard 1/8"
stereo phone jack and wire to work. We use telephone
connection cable and Radio
Shack phone plugs.)
ONLY $6.95
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