By Leola Dupond. wiring. Published at Tuesday, March 26th, 2019 - 00:15:13 AM.
Anyone whose job involves servicing electric motors has encountered the problem of a missing nameplate. Other articles in the Motor Doctor series have covered ways of determining the specifications of a motor lacking the nameplate, but what if you are trying to figure out how to wire that motor? For some kinds of motors, principally motors with terminal-based connections, basic wiring is self evident. The terminal board itself usually has markings that indicate where line one and line two are to be connected. But what if you need to reverse that motor, use a different (but available) voltage setting, or have a motor that has nothing more than a bunch of color-coded or numbered leads coming out of it?
The second edition of Domestic Central Heating Wiring Systems and Controls is available. The A-Z guide to central heating wiring systems provides a reference manual for hundreds of heating and control equipment. The book offers coverage of wiring and technical specifications. In this edition, the book provides more coverage of combination boilers, recently developed control features, and boiler efficiency ratings. Also included are numerous, easy-to-understand wiring diagrams with explanatory notes, the company says. Brief component descriptions are provided, along with updated contact details for most major manufacturers.
A common problem. Using a Varitone or Varitone variation means switching capacitance. Depending on the switch’s design and its location in the circuit, this can result in a loud popping noise in a passive guitar wiring scheme if you switch capacitors. You can prevent this by turning down your guitar’s volume pot or putting your amp on standby, but what if you want to use the rotary switch mid-song? There’s an easy solution: Get some 10M resistors. (I like 1/4-watt metal-film resistors because of their small size, but you can use any resistor type or voltage you want, so long as it has the correct resistance.) Solder one between the rotary switch’s center input lug (labeled “Center lug connects to volume pot lug 3” in Joe’s diagram) and the lug the capacitor is connected to. You need to use a separate resistor for each capacitor, which means a total of three resistors if you follow Joe’s diagram.
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