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All Memebers......
I'm glad to see some people joining and using the group. As you can
see, things arn't exactly super busy yet, but spread the word, I'm sure we can get some discusion going, and thats what it's all about after all..... Hope to get the Electronics 101 web page up and running very soon, will have a basic tute on electronics princables and some link in general to electronics pages of intrest........ Will speak to you all soon I hope....... The Sinister Dragon..... (Moderator) |
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Re: No metal in MOS?
Budijanto S
开云体育Hi Dough Hale,
Do you have any experience to replace vacum tube
with power MOSfet...???
Thank you
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Re: "manhatten incident"
Curtis Sakima
开云体育You're talkin' about the "Philidelphia Experiment"
I think.?? A movie was made about it.?? It even has that
name for a title.
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Curtis
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Dazzle Mom this coming Mother's Day season with flowers!
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Re: Triac instead of relay ?
Curtis Sakima
Question: Why is the current waveform sinusodal despite the voltage output
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being non-sinusodal?? How are you measuring it?? I would think it'd be nothing-snap-full-comingdownsinusodal-zero-nothing-snap-full-comingbackupsin usodal-zero. Just like the voltage. Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: Stefan Trethan <stefan_trethan@...> look at my attachment please. i also can not believe there is reactive power but how is the phase shift explained otherwise? thanks |
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Re: Triac instead of relay ?
Curtis Sakima
Got it.
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I'll try modifying future mail so you can see it. Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: Steve <alienrelics@...> I'm reading online so I can't see either picture, but I think I know what they look like. Alien Steve |
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Re: Triac instead of relay ?
Curtis Sakima
I think we could be getting into a semantic war with this thing. So ....
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instead of my talking anymore ... please ... everyone open up the *.bmp attachment of this email. THIS .... is what I saw on the scope output of the triac dimmer. The arrows indicate what moves as I dim the lamps up and down. The overall wave doesn't shift ... but that vertical line (indicated by the arrows) ... shifts left and right. As the area under the curve varies ... so does the intensity of the lamps. I thought a picture might settle this. Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: Steve <alienrelics@...> As you say, the turn on point shifted... but the turn off point does-not- shift. |
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Re: SMD's(Thanks All)
Curtis Sakima
Much agreed. Those were the days of individual still able to get a lot of
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parts (no need to be a shop). Also when Auto emissions were not such a big deal (hotrod .... DIY Weber Carbs ... headers ... etc.). Yes ... those were the days of much DIY. Me too .... 911 ... lost good electronics job. Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: Kenneth Smith <kensmith52@...> Well I graduated in 1966. Took Electronics last 2 years of HS. Lost 2 good jobs during the mid 80's when all the companies were merging and again 2 jobs after 911 due to business going down. Decided to start my own. I was very lucky as I was growing up that people would spend time to show me the things about electronics. I try to pass it on to others that need it and willing to learn. That is why this forum is good. There are a lot of knowledgeable people on here so the beginers can learn a lot. |
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Re: Triac instead of relay ?
Curtis Sakima
I used to work fixing stage-n-lighting light dimmers. We used
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oscilloscopes triggered by the incoming line AC. The output sine-wave never shifted left and right as dimming was varied. Just the sharp vertical line from "zero" where the triac triggered ... went "left and right". Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: Steve <alienrelics@...> Since the turn on point is delayed: The voltage and current in a resistive load are in phase. However, if you look at the voltage coming into the whole circuit, the current phase is delayed because of the delay between zero voltage crossing and when the triac turns on and causes the start of current flow. |
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Other ideas Was: 555 Filter
Curtis Sakima
Anyone thought of using a standard audio power amp with say, +/- 50 supply
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rails?? Then a sine wave oscillator could simply be hooked up to drive it. Another idea would be to use a class-D audio amplifier .... whose output would be a +50 volt to -50 volt swinging 250 Khz square wave ..... Pulse Width Modulated at a rate of 16 Hz (sinusodal). Low Pass filter this .... voila .............. Curtis Dazzle Mom this coming Mother's Day season with flowers! ----- Original Message -----
From: genteelu4ia <vortex_9x@...> ST, I was thinking ( that's where I get in trouble) I needed a sign wave to properly go through the setpup transformer to increase the voltage to 30v AC-- I do need AC on the output. I was thinking that a square wave would only produce a short pulse after going through the transformer. |
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