By Odette Bertin. wiring. Published at Monday, March 25th, 2019 - 20:34:59 PM.
He loves a rich, woody tone with nice overtones, so a certain cap from Roederstein is his standard. But he also wanted a warm, woolly tone as well as a slightly mid-scooped one, so we installed a rotary switch with his beloved Roederstein cap for the standard sound, a NOS paper-in-oil cap for the warm tone, and a standard “orange drop” cap for a slightly scooped sound. All three caps were 0.033 µF. The original Varitone design. The original Gibson Varitone design used an inductor to create a series of notch filters together with the capacitors. Personally, I think adding the inductor is not the best choice. The design may have worked in the ’50s, but today most of us are looking for different tones. (Joe described the tone of the original design in his article.)
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.
The book also includes end of section review questions and exercises that can be torn out and handed into the instructor for grading. A separate instructor supplement containing the answers to the end of section exercises is also available.
The second edition of Electricity, Electronics, and Wiring Diagrams for HVAC/R, a completely revised textbook from the Air-Conditioning and Refrigeration Institute (ARI), is now in print. The textbook, published by Prentice Hall, offers technicians a basic book on the principles of electricity and HVACR systems. Written for students and professional HVACR technicians, this new edition covers all of the key concepts and service techniques for electricity and electronics applications, says ARI. Everything from basic electrical wiring diagrams to modern electronic control systems is said to be covered in a clear, non-mathematical, applied manner.
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