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Everything posted by mixos

  1. By clicking here you can download a circuit that is an ion generator and consists of a voltage multiplier circuit. This is a usage of an voltage multiplier circuit :) Also this is another design of the voltage multiplier:
  2. You can use a switch of this type if it is suitable: I can't find something closer to a mercury switch. You can also attach a bob on top of the foil to make it more motion sensitive.
  3. Hello You can also check the following site for more photos - info: http://www.geocities.com/SunsetStrip/Underground/8585/loop.html http://www.iri.tudelft.nl/~geurink/magnloop.htm http://www.uksmg.org/loop.htm http://www.standpipe.com/w2bri/ http://www.radioworks.com/nloop.html http://www.g3ycc.karoo.net/loop.htm
  4. This happens if you measure the voltage across the final diode. If you measure the voltage at the point where the last capacitor and diode are connected (upper right corner of the circuit) refering to the ground then the voltage you measure is the multiplied one.
  5. mixos

    Speaker Design

    Here is a list of speaker designing sites ;) : Audio Illusions: http://indigo.ie/~walton/audio1.html The 3D-Spiral Horn Speaker Building: http://www3.ocn.ne.jp/~hanbei/eng-intro.html Audio Lab Loudspeaker Plans : http://www.ee.gatech.edu/users/207/labsp/ Audio Lab Loudspeaker Plans (2) : http://www.ee.gatech.edu/users/207/labsp2/ William Cowan's Peerless 831857 subwoofers : http://www.geocities.com/ResearchTriangle/9329/tlees.html The Russ Button Subwoofer : http://www.button.com/Russ/audio.shtml#subwoofer Monolith Subwoofer (Jerry Lynds) : http://husky1.stmarys.ca/~j_lynds/Monolith.htm Paul Horn's Subwoofer (6th order) : http://www.linkline.com/personal/phorn/audio/hs_subwoofers.html Luther Ward's Sub Atomic Express : http://wardsweb.org/audio/beast.html Patman's SUNosub : http://www.io.com/~patman/sunosub.html S
  6. After a little research i noticed that the semiconductors packages are millions!! :o. Also each company has it's own. Some common packages can be found here: http://www.necel.com/discrete/english/products/transistor/pkgquick.html
  7. Here is a list with high power fm transmitter circuits 8) : http://www.see.ed.ac.uk/~gjrp/EE3/Comms/Lecture10/sld009.htm http://www.aaroncake.net/circuits/3Wfmtran.htm http://members.tripod.com/xexorz/schematics/fmtrans1.html http://w1.859.telia.com/~u85920178/tx/v6_00.htm http://w1.859.telia.com/~u85920178/tx/v7b_proj.htm http://www.radio101.de/radio101/schalt-e.htm http://www.geocities.com/Area51/Nebula/3736/40watt.html http://w1.859.telia.com/~u85920178/tx/bug5.htm
  8. The best way is to use a FM Linear like this: Linear FM 30Watt : http://www.electronics-lab.com/projects/rf/010/index.html This circuit connects to the output of your transmiter and it is able to make a 4-5W transmitter to 25-30W one. Alternative you can use a FM antenna booster (active antenna) like this: http://www.electronics-lab.com/projects/rf/022/index.html About the anntenas you can read this article: http://www.scott-inc.com/html/fmant.htm
  9. The designer of the circuit writes that the filter must be driven by a preaplifier, but i think that it can be also driven by an amplifier directly. Don't worry about the pontesiometers. They will do the jod. I haven't tested it, so i don't know about any effect in the cut-off frequency. No there is no need of a crossover. The circuit will cut off all frequences out from the 20-100Hz ragne.
  10. A list of Heathkit transistors can be found here: http://www.sarrio.com/sarrio/rsman2.html I wish this helps you. ;) Mike
  11. Did you mean BPW77 Transistor ? BPW77N is a very high sensitive silicon NPN epitaxial planar phototransistor in a standard TO
  12. I use OrCAD which is a compete electronics development studio. It includes schematic capture, spice and layout editor. I like it but it is not very easy to design a pcb. It has autoroute function but it is not so "clever" it can turn a simple pcb into a huge one. Maybe i make a mistake in operetion of that software. Otherwise you can use it to manual route your pcb and then the result can be nice. The component database is huge also and i have not noticed any pad problems.
  13. Ever wondered to have your own UV exposure box to be able to develop your pcb at home? Read this guide that explains you how to build a professional UV box with digital timer and a total light power of 19,2 W. You can find the guide here: http://www.electronics-lab.com/articles/uv_box_fluo/index.html
  14. You mean an electronics CAD or general CAD programs?
  15. The input voltage can be anything from 8V to 35V, but keep it at the voltage that the motor uses and not below 8V. As saws the schematic. You take a switch and connect the one pin of it to the ground. The other pin to the pin 10 of the parallel port and from that pin with a resistor to +5V that exist at the output pin3 of MC7805. By the way there is a place on the pcb for that switch. For home switches you follow the same practice. Also check this artwork to see how to connect it to pcb.
  16. Yes these are jumpers. They are used to define the mode that each stepper motor works. The modes are: two-phase, one-phase, half-step, step-inhibit. You can see how to set by reading this table: L means Low H means High If you put the jumper then its Low (it short circuit the pin with ground) otherwise is High. So for each motor use the above table to set the modes. J1 changes the pin9 state and J2 the pin10 state of U1 J4 changes the pin9 state and J3 the pin10 state of U2 J6 changes the pin9 state and J5 the pin10 state of U3 You can read the datasheet for more info on the UCN5804B Also check the manufacture's site
  17. The through is that the documentation is not clear. First you must not confused by the schematic. The schematic only saw the one of the three controllers that the pcb includes (UCN5804B).With the same way the other two are connected. So the x=6, y=7, z=8 means that for U1 that controls x motor you connect the pin14 to the 6 of the parallel port. For the U2 that controls y motor you connect the pin14 to the 7 of the parallel port e.t.c. The same you must do for the x=2, y=3, z=4. Did you get the logic of it? But if you build it with the pcb the things are easier. The only thing you have to do is to connect the numbers that you can see on the pcb overlay to the same numbers of the parallel port connector.
  18. The circuit and some typical part values are the next:
  19. Nice idea. I will include it in future updates.
  20. You are right Chevees but with a 1024x768 design (that's what most people use at this time) the content of each page is more and i mean that the thing you can saw in one screen is more. Otherwise to build a site for more than one resolutions it is not easy for me.
  21. mixos

    FM Radio

    The IC3 = LM386 is a low voltage audio power amplifier. It's voltage gain can be adjusted between 20 and 200 with the external parts. So you can remove it and drive the speaker with your own audio amplifier.
  22. A 50V 2A rectifier would be nice. If you use a 24V tranformer then the max output voltage that you can get is 21V (because the Vin must be around 3V higher that Vout). For that value (21V) and the use of this equation: Vout = 1.25V * (1 + R2/R1) + Iadj * R2 (that describes the LM317) => R2=[(Vout/1.25) - 1] x R1 (because Iadj=100uA typical) and if R1=240 => R2= 3,8k But it's dificult to find a 3,8k pontesiometer. For that reason use the nearest value. Nothing else must be changed. A transformer must be capable to deliver 2A at minimum. Yes. It is reccomended that you use a heatsilk. If you consume more than 1W then you must use it.
  23. Regulator: The best is to use LM317T which is in a plastic package TO-220 and has a load current 1.5A. Like this: http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=LM317T&type=store Transformer: You need something like this: http://www.allelectronics.com/cgi-bin/category.cgi?category=790500&item=TX-2815&type=store Bridge: You need any rectifier bridge that can handle 2A. Nothing special. Example: http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=FWB-206&type=store Casing: Imagination is the only way to find a good case ;)
  24. The Electronics Lab community is on the "AIR". Make it the best Electronics Community on the net. Feel free to start discussing anything you like.
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