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  1. alfa88

    Can anyone help with filter calculator/simulator sites?

    Here's one for L-C filters: http://www.deephaven.co.uk/lc.html
  2. alfa88

    Transistor I.D. help

    If your transistor isn't totally toasted and you're able to determine if it's a bipolar NPN or PNP you could probably get away with using either a TIP3055 for NPN or TIP2955 for PNP. I'm assuming it's a TO220 package.
  3. alfa88

    Transistor I.D. help

    Planestock.com has them.
  4. alfa88

    SMD circuit tips

    Jameco has a nice tutorial on their home page using regular tooling.
  5. alfa88

    best materials for pcb making using laser printer method

    I use HP presentation paper. It's slightly glossy and I've had very good results. There is a post on Instructables on making etchant from hydrochloric acid and peroxide ( Stop Using Ferric Chloride). The advantage being that it is reusable and cheaper. I couldn't find the proper acid strength at...
  6. alfa88

    Rear Projection TV

    Cover 1 color projector at a time to see if it is specific to 1 tube.
  7. alfa88

    Rear Projection TV

    Blanking circuit faulty?
  8. alfa88

    Fisher CA-283 Display/Control Board

    Do Tesla's procedures 1st. Here's a couple of other ideas Is there 1 controller chip per channel? If yes then it's unlikely to be the IR2E29 chips. If you can get info on the display you could try applying voltage to various segments to see if it'll light up. Use a 1k resistor to avoid damage...
  9. alfa88

    Braun Toothbrush Schematic

    I'm trying to resurrect a dead Braun toothbrush and have the circuit partially figured out. It uses inductive coupling to charge the battery. One half of the circuit is for charging and the other half is used to control the motor. What I found so far is that there was a open from the motor body...
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