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DC Power Supply
We recommend a power supply with a maximum output of 12V and not less than 7V, with a minimum of 100mA, centre pin positive.
Note: Some switch mode type power supplies can cause grounding problems. A small accessory lead is supplied to enable the
ground connection from the 12V input socket to be established. See Fig (18). This is not necessarily a Well Tempered Lab
recommendation.
Fig (18)
Making a Belt
Loop a long length of .004mm polyester thread around the thumbtack. Tie a simple double overhand knot around the pin. Remove
the pin and tighten the knot. Hold knot with thumbnail and pull on excess. Cut off excess leaving 10mm (minimum) tails.
492mm (19 3.7")
Thumbtack (Drawing Pin)
Pin
.004mm polyester thread (White or Black). Black cardboard for White .004mm polyester thread.
White cardboard for Black .004mm polyester thread.
12
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