By Odile Cohen. wiring. Published at Monday, March 25th, 2019 - 02:06:03 AM.
Having a master tone and two separate volume controls in a dual-humbucker—aka HH—configuration is nothing new. In fact, it’s widely used by such companies as Ibanez, Schecter, and Charvel. Cap and trade. The basics of this wiring are easy, as you see in Fig. 1. Again, each of the pickups has a dedicated volume control, yet they share one common tone control. Because it’s not possible to use different tone caps for each pickup with this wiring, you have to decide what tone cap will work best for both pickups. For most factory stock wirings like this, the value is 0.022 µF. But in a HH configuration, many players like the classic 0.022 µF for the bridge pickup and a 0.01 µF tone cap for the neck pickup, so a practical compromise is a value of 0.015 µf.
Last week we discussed the basics of gas boiler wiring and wiring in general. Now let’s add safety and limit controls for each type of system. I’m going to start with a steam boiler, since it is the least complex and the easiest to understand. A steam boiler uses a pressure control that opens on pressure rise and a low water cutoff (LWCO) that opens when the water drops below a predetermined level. First let’s talk about LWCOs a little. There are two types of LWCOs, float types and probe types. The float type is installed in a water column (on residential boilers, usually the gauge glass); a float opens and closes a switch as the water level changes. The probe type installs into the boiler water and uses the water in the boiler to close the circuit.
Some manufacturers, he said, don’t seem to listen much to people in the field who actually install and service the equipment. ”They have their own engineers” and are more likely to listen to them. However, according to Porter, ”the guy in the field has a better idea of what is needed in the field.” Many air conditioning dealers he knew were not satisfied with the products available. Porter said he was encouraged to try his hand at inventing by other dealers, many of whom said, ”You build a better mousetrap and we will buy it.”
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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