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RESISTANCE SUBSTITUTION BOX
MODEL K-37
Assembly and Instruction Manual
Elenco
Electronics, Inc.
®
Copyright © 2004 by Elenco
®
Electronics, Inc. All rights reserved.
753400
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
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Summary of Contents for Elenco Electronics K-37
- Page 1 RESISTANCE SUBSTITUTION BOX MODEL K-37 Assembly and Instruction Manual Elenco Electronics, Inc. ® Copyright © 2004 by Elenco ® Electronics, Inc. All rights reserved. 753400 No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
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Page 2: Parts List
The Resistance Substitution Box is a convenient instrument in determining the desired resistance values in circuits under design or test. The values selected for your resistance substitution box were determined to be the most commonly used in modern solid-state circuits. The values are from 10W to 1,000kW (1 meg) in 24 steps. -
Page 3: Parts Identification
PARTS IDENTIFICATION Switch PC Mount IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors. BAND 1 1st Digit Color Digit Black Brown Orange Yellow Green Blue Violet Gray White Switch 12 Position 9mm Nut PC Board BAND 2... - Page 4 CONSTRUCTION Introduction The most important factor in assembling your K-37 Resistance Substitution Box Kit is good soldering techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40 watts is recommended. The tip of the iron must be kept clean at all times and well tinned.
- Page 5 ASSEMBLY INSTRUCTIONS Begin the PC board assembly with resistor R12. Be sure to identify the correct value by reading the color code. Place the resistor into the PC board with the leads coming out on the copper foil side. Solder in place and clip off the excess leads, close to the connection.
- Page 6 SW3 - PC Mount Switch Mount SW3 in the place shown on the PC board. Solder into place. Red Test Lead Black Test Lead Cut off 1 1/2” of wire off of both the red and black wires (SAVE them for later use). insulation off both ends of the 10 1/2”...
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Page 7: Schematic Diagram
Installation of Knobs without an Ohm Meter If an ohm meter is not available, turn both switches so that the wiper contact is in the position shown in Figure 5. Start with switch SW1, follow the copper run on the PC board from the lug in contact with the wiper to the 470W (R7) resistor, to be sure that the switch is set in the proper position. - Page 8 Elenco ® Electronics, Inc. 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Web site: www.elenco.com e-mail: elenco@elenco.com...
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