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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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RESISTOR SUBSTITUTION BOX x DECADE BOX (RESISTANCE) xx RESISTOR A combined resistor and capacitor substitution box. Provides 12 capacitor values from 470 pF to 100 uF. Dial-up resistance substitution box lets you choose any value from 0 to 999,999 ohms (in 1-ohm steps) using thumbwheel dials. Resistance substitution box goes from 1 to 1,111,110 ohms in 1-ohm steps. Mini resistor rack holds 20 of the most popular resistors. Use to make quick resistance changes when troubleshooting equipment. Est. cost: $3. Build your own audio test gear. Part 5. Building a resistor substitution box (1 ohm to 11.11 megohms). Est. cost: $70 (kit). Test-bench resistor box keeps 50 resistor always ready and safe from damage. Est. cost: $18. Low-cost resistance decade. Universal decade box gives resistance of 1,2,3,...10,20,30 ohms. Est. cost: $3. Instant patch box provides a shielded method of substituting resistance, capacitance or inductance into a circuit with a minimum of problems. Resistance substitution box has three dials for setting values from 200 ohms to 1.1 megohms with 10% or less error. Est. cost: $5. Resistance substitutions cube has 24 resistors that can be used singly or in series to produce all resistance values of 1 to 9 ohms and all multiples of 10 of these values through 100,000. Resistor bank. Build a resistance substitution box with seven ranges covering 10 ohms to 68 Megohms. Est. cost: $33. Combination RC substitution box. Flip switches to substitute heavy-duty resistors or capacitors individually or in a series or in parallel networks. Range: 0-12,500 ohms. Modification to the Heathkit Model IN-37 resistor substitution box provides more than 200 different values instead of 36. Wheatstone bridge substitution box gives values from 1 to 999,999 ohms. Resistance decade box uses rotary switches to overcome some problems with other units. Build an active power R box. This circuit can convert any resistor, fixed or potentiometer, into 40-watt power resistors. Use it to simulate a wide range of load conditions when building and repairing power supplies. Build a resistance capacitance substitution box. Provides resistances from 0.5 ohm to 20 megohms and capacitances from 5000 pF to 2 uF. Dial-up resistance substitution box uses six thumbwheel switches to choose any resistor value from 0 to 999,999 ohms. Variable resistor-substitution box uses one or more potentiometers in place of resistors. Circuits for a resistance decade box that has six decades ranging from one ohm to one megohm. Resistance-capacitance decade box. Rotary switches let you vary resistance from 10 ohms to 11.111 megohms and capacitance from 100 uF to 10 pF. Est. cost: $130. Dial-a-ohm resistance substitution box. Pot Box. Twelve potentiometer values controlled by only four knobs through the use of 3-position, double-throw switches. Resistance from a few ohms to 10 megohms. Est. cost: $22. Power resistor load box provides resistances from a fraction of an ohm to more than 3700 ohms, with a power rating in excess of 25 watts. A built-in current-monitoring meter, fuses and enough banana plugs for series, series/parallel, and parallel connections. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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