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    Resonant transformers

    Has anyone played with DC to AC inverters? I've been repairing an inverter. It is a 24VDC to 120VAC 750W unit. The failure sympton was low voltage output atound 90 V. The circuit uses a complementary symmetry pair of transistors feeding a center tapped primary . The...
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    Lead-Acid BATTERY-Negative tab rotten& Chapped. Whyy ???

    Battery corrossion I find it difficult trying to describe what's going on in a battery circuit. External to the battery I think in terms of electron flow; inside the battery the terms reference ion flow. There's a lot happening, and different depending if it's...
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    Lead-Acid BATTERY-Negative tab rotten& Chapped. Whyy ???

    Charging the battery When you charge the battery the electron flow is forced the other way. Hopefuly you increase the flow only enough to force the acid out of the plates and back into the water (electrolyte). If too much voltage is placed across the battery and the recharge process...
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    Lead-Acid BATTERY-Negative tab rotten& Chapped. Whyy ???

    Battery terminal corrosion Your corrossion is due to galvanic recation. Your batteriy's negative terminal is made of material that has more free electrons than the positive terminal. ( the nature of your lead acid cell. As curent (electrons) flow from the negative terminal to the...
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    Mobility scooter batteries

    Scootter batteries I would try switching the batteries around to see if the charging rates are different. I't may be the chargers are different, or one is defective. If the batteries are the same and the same condition, they should charge at realitivly the same rate. Once you are...
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    out of my depth!

    I have a similar problem with my tachometer on my 94 Nissan, SEV6 pickup. The tach intermitently pegs itself and sometimes goes back to indicating the right RPM. it does this with the engine running,or not running with just the ignition switch on. I 've looked high and low to...
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    Convert 3 Phase Motor

    A simple capacitor added will not make a staic converter. Your concept of adding a capcitor possibly mimicks a capacitor start motor where you shift the input phase of one winding to get the motor field rotating. The static converter does shift the phases but to each...
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    Help with a circuit question

    Cicuit Diagram I'm curious; what does the inverted triangles represent? Is that your symbol for ground/common? Also is Vee positive or negative? I would make certain assumptions considering it's a PNP transistor. ;)
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    Convert 3 Phase Motor

    Another retail source (in the US) for Static or Rotary phase converters is the Grizzly Tool Company. (Do a Google search). Their units are for use with their woodworking and metal working machines. Most 3 phase motors have dual 220/440v windings and these converters are made...
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    Car audio sound blocker

    Sound Blocker! Great Idea! So many inconsiderate motorists in my area like to play their music so loud, I can hear it in my home as they pass by. I wish there was a device that would silence them to a level only they could hear. Also, when I go to the pub, the musicians seem to...
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    Convert 3 Phase Motor

    I've used phase converters to run lathes, milling machines, and valve operators when 3 phase power is not available. I prefer to use VFD (variable frequency drives) as these are much more efficient and caplable of full load speed and torque, but static converters are a lot less...
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    What does C rating mean for batteries? Speed of discharge?

    My original lead acid (plante') were 1/2 the size of the ones in your photo I've since replaced them with Ni-cads. Same capacity but 1/2 the size again. Stil 950A/hr. System is 130V, 65 cells.
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    How to calculate sufficient battery backup power?

    Battery Capacity The battery required may make this not feasible. Your ampacity required will be what your inverter draws under full load (pump, pumping). You will most likely find is your inverter is very inefficient, it draws more current idling that the motor itself. A better alternative...
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    Problem Melting Solder

    Lead Free solder I'm partial to Kester 63/37, and 60/40. I clean desoldered holes and leads with acetone.On stubborn cases I use a little paste flux. I've tried lead free solder; I don't like it. It acts different (obviously). Maybe it just takes getting use to. It's...
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    3ph motor running on square wave?

    Just about any ac motor will run on square waves. Think in terms of digital audio (music). You are trying to approximate a sine wave by chopping it up into lots of tiny pieces (on/off pulses). I this case you are altering the applied waveform to change it's duty cycle...
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    What does C rating mean for batteries? Speed of discharge?

    Low voltage can be deadly if high enough ampacity I work with a battery bank where each individual cell can supply 950 amperes. We insulate the terminals, you would not want to drop a open end wrench across them! Also, they produce hydrogen when charging, creating a hazardous...
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    24VDC lighting systems?

    24VDC Led lighting Interesting post; I haven't seen this used anywhere in my area. We've used Led lighting in Hazardous locations but it is 110VAC, and very expensive.
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    Electric Motor Question

    Electric motor, Electric car I would suggest using polyphase AC motors. They are smaller than single phase motors. Operate polyphase motors with a variable frequency drive, Speed and torque are a function of voltage X frequency. The motors should be inverter duty which...
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    Homemade Shunt Resistor.

    I’ve built crude shunts for analog meters, typically milliamp ranged. I would find a carbon resistor a little smaller in value and then file a notch in the resistor while connected in circuit until the meter reads the correct value, then seal with a little dab of fingernail polish...
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    Bus wire?

    It's just plain o' uninsulated hook up wire, for point to point chasis wiring.
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