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As far as reproducing sine waves, I have done some preliminary experimenting with using one of the Universal SMPS circuits I made as an audio amplifier driving an 8 ohm load and a pull down resistor. I think the pull-down resistor could be replaced with another SMPS. Then both halves of a waveform c...

Have you seen the design which I have come up with at http://groups.yahoo.com/group/switchmode/ yet? It is the basis of all of my switching power supply projects. It is the culmination of years of R & D. If you study this design and experiment with it, you can become proficient in SMPS design th...

Al, power supplies are my specialty in my work as an analog designer. Due to disability, I have been out of work for a long time. I would love to take you up on your offer, but am not sure if it would be possible. Did you see my work at my Web-site?<p> http://groups.yahoo.com/group/switchmode/ <p>[ ...

I would just use P=V^2/R using V=120V. It gives an answer of 1440 ohms. At 100V, the resistance will be a little less. Those power ratings for the bulbs are only accurate for 120V being across them.

Yes, all the power is transfered through the transformer. At high frequencies, less magnetic material is needed because the magnetic field changes polariey before the core has time to saturate.

My niece's friend has an EE degree, unlike me. He is young which may be one reason why he is employed and working on such projects as switching subwoofer amps. It also helps that his IQ is around 140. <p>Bob, so that explains your scarcity on the board. I don't think my inverter design would be more...

The last time I dozed off at the wheel was the LAST. I awoke heading straight for a light pole in a 79 Honda Civic going 50mph.

Oh, so that is how those low cost inverters work then. I had purchased a 150 watt one once to study how it was made, but never got to playing around with it. The idea I had come up with used true sine wave then, I guess, because it would use two of those switching power supplies I designed, each one...

Hello Ron, sorry I am slow in getting back. Maybe you could not follow it because I mistakenly had the zener diode connected to the emitter of the feedback transistor instead of connected from its base to ground.<p>But I have meanwhile thought of a much easier regulator to build for high currents. I...

You could come close to a few parts if you use a transformer, rectifier, filter cap, high current PNP transistor with a base resistor, NPN transistor with its base resistor tied to the filter cap, and a zener diode connected from its emitter to ground.<p>The output is taken from the collector of the...

Or the oil from orange peels, which I believe contains the active ingredient d-limonene.<p>I have used electrical tape for transistors which do not get very hot. You have to be aware that excessive heat can cause the tape to melt and let the metal tab of the device short out against the heatsink. I ...

Hello all,<p>You may get an idea of my age from the fact that I distinctly remember my first TV viewings as Neil Armstrong stepping out onto the moon and episodes of the original _Star_ _Trek_.

Best wishes Ron. Keep up the good work.<p>Well as for myself, I am not really a professional anymore. I completed a 2 year Physics program, was employed as an electronic repair technician for about 10 years, and now do design work quite independently.<p>You can see my rather modest crowning achievem...

I have heard that one drawback to today's fuel delivery system is the minimum droplet size attainable with fuel injection and carburation is too large. Maybe better fuel economy could be obtained if the fuel were heated right before injection.<p>Too bad citizen's insight is poor. They should not hav...

Hello all,<p>I thought it important to let you know that I have changed the Web address for my switchmode power supply design information: http://groups.yahoo.com/group/switchmode/ The ealier post in this thread has the old link. Please add the new link to your favorites.<p>[ February 22, 2003: Mess...