The inspiration for this project was Jaycar's RR0700 Resistance Wheel. It is a compact and handy tool; we have one in our drawer and use it often. It has a good range of resistance values consistent with commonly available parts, and you can easily step through them by rotating its dial. Unfortunately, though, it appears to have been discontinued. Back in August 2015 we published a Resistor-Capacitor Decade Substitution Box. This was designed by Altronics, who have it available as a kit (Cat K7520).
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