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About RFamateur

  • Birthday 11/25/1983

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  1. Hey, I was wondering if it was possible to get a lesser version of multisim that isn't so expensive. I have just used up my 30 day trial and I have to say I'm hooked-- this program is by far the best I've used. Anyway it would seem NI sells the basic version for 1.5k; a bit higher than I want to be paying at the moment, especially since I would really like to feel fully proficient before spending that kind of money. Well I was wondering if anyone knows of a training version or something similar for cheaper, but with a lot of the same features. Thanks!
  2. Impedance is essentially an elements resistance to AC power. In the case of transistors, when you have a low input impedance and a high output impedance it is usually evidence of a voltage amplifier, or common-emitter configuration. On the other hand high input and low output impedance tends to produce current gain (tends to be common-collector). With equal impedances you tend to produce power gain and is usually called a common-base configuration in transistors. The last configuration isn't used too much but it is used in RF amplification :D. RF
  3. Hey so I'm trying to optimize my power supply design for cost. The circuit design to me isn't a problem but my familiarity with fabricating front panels and mounting various components to an aluminum chassis at a low price is a problem! I looked at the website suggested earlier for professional quality front panels, but right now that's not really what I'm looking for. I am looking for a supplier of aluminum panels with various dimensions and reasonably priced; particuarly, dimensions which would fit a front panel design. Any suggestions are welcome!
  4. Thanks guys that was most helpful. On a side note I have been fabricating an old CD player as the case for the power supply, but it's turning out to be more difficult than I originally thought. Any suggestions on relatively cheap project boxes and the best tools to use for mounting switches, transformers, etc.? Thanks!
  5. Hey, so I'm building a dual polarity power supply and I'm having the hardest time finding the capacitor rating I'm looking for. I was under the impression this capacitor was fairly common but after digging around it seems to be really hard to find. I have found 4700uF electrolytic capacitors with a 50 volt rating, but pretty much no 4400uF capacitors. If anyone has any suggestions on a good place to get these, than please don't hesitate. Perhaps Jameco?
  6. Hi, I've just recently started circuit design as a hobby and I'm looking for recommendations on electronic surplus stores. Right now I'm interested in building power supplies and amplifiers, but I like to experiment with a variety of systems including transmitters and converters. Anyway I'm having a hard time finding a good place online that sells parts. This includes passive components, active components and pretty much any type of hardware. I do know a few sites, but I'd like to hear other opinions. Also, I live in the Seattle area so if anyone knows any great stores besides Vetco and Fry's that would be very helpful! Thanks
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