Generator harmonics question(s)

Started by Anonymous in sci.electronics.basics5 years ago 3 replies

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I...

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I saw the major 60 cycle waveform and then a lot of smaller waveforms at higher frequencies. I was told that these harmonics were typical of small generators. Today I am replacing the voltage regulator on a small generator and adjusting the governo...


Small generator over-voltage

Started by Bob Engelhardt in sci.electronics.basics3 years ago 15 replies

If there's a better site/forum for this question, please let me know. I have an old (mid 80's) Sears Craftsman generator - 4 cycle B&S engine...

If there's a better site/forum for this question, please let me know. I have an old (mid 80's) Sears Craftsman generator - 4 cycle B&S engine & 120v, 1350W rated output. (Jeff - model 580.328172) I haven't used it in decades so I cleaned it up & checked it out with the intent to donate it to the Habitat ReStore. Imagine my surprise when I measured the no-load output voltage at 134v ...


Filtering generator output?

Started by Anonymous in sci.electronics.basics9 years ago 7 replies

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine...

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine wave was and how close to 60 Hz it was. Well, the main sine wave looked good and the frequency was very close to 60 Hz. It floated around a little as the load changed but then would stabilize very close to 60Hz. However, there were lots of other small...


Simulating Power Bandwidth

Started by Jim Thompson in sci.electronics.basics8 years ago 24 replies

I'm trying to do a simulation to show power bandwidth for a (high power) OpAmp versus compensation capacitor. In the lab I would simply crank...

I'm trying to do a simulation to show power bandwidth for a (high power) OpAmp versus compensation capacitor. In the lab I would simply crank up the signal generator amplitude until the output became triangular rather than sinusoidal. Collect all the data for peak amplitudes versus frequency and then plot. Any ideas how I might do that automatically in a simulator, generating a family...


*small* spark generator

Started by ScottM in sci.electronics.basics10 years ago 20 replies

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic...

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic line going high (going low would work, too.) The voltage supply is 6v or 12v from a battery. The problem is that I need the circuit to fit inside a 1.5" inside diameter PVC pipe, and not take up more than, say, 3" of the pipe length, discounting battery...


Thermopile power supply in water heater control

Started by bob prohaska in sci.electronics.basics6 years ago 12 replies

I recently bought a gas water heater and made a point of getting one that didn't require external electrical power to operate. To my...

I recently bought a gas water heater and made a point of getting one that didn't require external electrical power to operate. To my astonishment, it nonetheless came with what behaves like a digital controller, complete with a green LED status light that must require close to 3 volts to turn on. The electronics are operated from a standard Honeywell thermopile generator producing 750 ...