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Page 2
~~•w*'*t'+*'
ASSEMBLY
AND
HEATHKIT RESISTANCE
OPERATION
OF
THE
SUBSTITUTION BOX IN-12
The Heathkit Resistance Substitution Box provides a rapid and flexible method of determining
resistance values when working on electronic circuits.
Its usefulness will many times repay
a little extra care devoted to its construction.
Upon receiving the kit, unpack it carefully and
check each part against the parts list.
In this way you will become familiar with the various
components and also will avoid throwing away any parts with the packing material.
NOTE:
ALL GUARANTEES ARE VOIDED AND WE WILL NOT REPAIR OR SERVICE
INSTRUMENTS IN WHICH ACID CORE SOLDER OR PASTE FLUXES HAVE BEEN USED.
WHEN IN DOUBT ABOUT SOLDER, IT IS RECOMMENDED THAT A NEW ROLL PLAIN-
LY MARKED "ROSIN CORE RADIO SOLDER" BE PURCHASED.
CONSTRUCTION
The construction of this kit is extremely simple.
Reference to the notes below should prove
helpful as they explain the method which was found to be most convenient for wiring.
1.
Refer to the detail drawing below and mount the terminals to the panel. Both terminals
are insulated from the panel with fiber washers. Keep the solder lugs pointed in the
direction shown in the Pictorial. Install a cap on each terminal.
2.
Mount the SPDT slide switch on the panel. See the pictorial for proper positioning of the
switch lugs.
3.
The major portion of wiring concerns connecting resistors to the rotary switches and fig-
ure 8 ring. The resistors for each switch group should be first identified by referring to
the color code chart on Page 4 and then arranged in logical installation sequence so that
they can be readily installed. The switch leads of all resistors should be cut so that a
maximum length of 3/8" remains. Do not cut the other resistor lead at this time.
~
~
1110
',@',,
~
SMALL
GRO~emNHR
~
SETSCREW
CLIP THE POINTER
ONTO THE KNOB
OPPOSITE THE
SETSCREW AS
SHOWN.
15
16
SINGLE
2
INNER LUG
6
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