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Public Electronics Circuit Archive
Hello everyone,
I have created a website, called the Public Electronics Circuit Archive, where people can submit their own electronics circuits, designs and ideas for others to look at, build, modify or redesign to their heart's content. No-one gets paid, anyone can use it, and every circuit and idea becomes free-gratis public property, so everyone benefits. The circuits will be categorised, (currently 13 categories from Audio to Toys), and there is a public forum for electronics hints and tips that spring to people's minds from time to time. I think it would be a great addition to Ian's electronics list! So, if you would like to take a look (no circuits yet - get designing!!), please visit, Thanks and Regards, Dan Bartlett Public Electronics Circuit Archive Webmaster |
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Re: Schematics to Circuit Board?
Svata
Hi Thomas, have been using EAGLE 4.01 light for quite some time. It is excellent, with extensive
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symbol libraries, together with DRAFTCAD from ", [not available in lighy or demo], but I have never used the Circuit Board part of any of them, preferring to hardwire the one off jobs that I do from time to time, unless I would do something from a kit that includes the printed circuit board as well. Regards, Steve At 08:33 PM 3/22/01 +0000, you wrote:
--- In Electronics_101@y..., erdem ulukan <erdemulukan@y...> wrote:Dear Thomas,Where can I get BoardMaker? |
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Re: Schematic Symbols Book?
Thomas Lee Mullins
--- In Electronics_101@y..., tipf_1@y... wrote:
--- In Electronics_101@y..., "Thomas Lee Mullins" <tomleem@a...>Thanks for the information. They are also in the Radio Shack catalogue (I didn't think of looking until you posted your message). They might even have them at their web site (which is ) but I didn't think of looking there until just now. |
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Re: Schematics to Circuit Board?
Thomas Lee Mullins
--- In Electronics_101@y..., erdem ulukan <erdemulukan@y...> wrote:
Dear Thomas,Where can I get BoardMaker? I found software from that has a program called Eagle CAD. It was free for/to hobbiest. Have you heard about/know anything about it? |
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Re: Schematics to Circuit Board?
erdem ulukan
Dear Thomas,
You can use BOARDMAKER Program to convert schematics to a circuit board. You must modify the board because it doesn't work properly and can't give the right answer. But it can give a design idea :) *ERDEM**** --- Thomas Lee Mullins <tomleem@...> wrote: Is there software that can convert schematics to a __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. |
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Re: New to list
Tavys Ashcroft wrote:
Hi, I just joined this group.? I was actually thinking of starting my
????????? Good to see you join. The groups a bit quite at the moment, so send as many people as you want this way, the more the merrier, And the more we will all learn........???? Hope to hear from you shortly........ )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O(? )O( ???? The Sinister Dragon
Hey, Just becuase I'm EVIL,
Visit My sites at Geocities:
Join my Egroup:
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Amplifiers
Tavys Ashcroft
So I'll just get right into it. I'm currently on transistor amplifiers. We haven't gotten to push-pull stuff yet, or any IC opamp stuff, so I'm sure my questions will be answered in class later. But I'm impatient.
If anyone here knows a bit more about this stuff please speak up. If I understand this correctly, common emitter amplifiers are for voltage gain, common collector amplifiers are for current gain and impedence matching, and common base amplifiers are used for their low input capacitance and therefore better frequency response. So if I string these together, I'd just end up with both voltage and current gain with better low frequency response, right? And for push pull stuff, do I need to have both positive and negative power supply (with respect to ground) and use both npn and pnp transistors or is there another way? With single transistor common emitter amplifier stuff I've done in lab so far I've seen the waveform distortion of a sine wave amplified to cutoff voltage, so if I put another common emitter in after this using the opposite transistor type and opposite power supply, would I get distortion spikes in the opposite direction? I'm interested in perhaps making my own audio effects circuits. I've seen lots of schematics on line, but not a lot of technical description to go with them. That's all for now I guess. More to come. -Tavys |
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New to list
Tavys Ashcroft
Hi, I just joined this group. I was actually thinking of starting my own, but I found this one. I'm taking electronics classes and learning a lot, but have found very little tutorial information online that I find useful. I figure that as I learn stuff perhaps I could make tutorials and hopefully there's people on this list that know more about stuff than me. I've just gotten to common emitter/collector/base circuits in my semiconductor theory class, and I can't wait to get to ICs.
I'm on another list called 'benders' which is for people who are interested in modifying toys (casio keyboards, speak and spells, etc) to make sounds they were not intended to make. I may direct some of the people this way as some of the discussions on the list have gone more into the area of theory than just simple modifications to toys. So who all is here and what do you do with electronics? -Tavys |
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Re: Schematic Symbols Book?
--- In Electronics_101@y..., "Thomas Lee Mullins" <tomleem@a...>
wrote: Is there a book on schematic symbols? I have schematics for aYes, you can go into any radio shack and pick one up for about $5. Plus some ok basic electronic books. |
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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.
?
Curtis
?
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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