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  1. MP1

    Garage door Status Indicator

    AJ, I don't see why this is an important question in regards to the original post, but I am sure sasha would appreciate any good advice that you would like to add regarding the use of relays. MP
  2. MP1

    pseudo double-gang pots with transistors...

    CRE, The use of FETs and OTAs are common in audio when needing multiple control from a single pot. Another option is the use of opto isolators such as the CLM6000 which is a combination of an LED and LDR in a light tight container. The CLM6000 by clairex is obsolete, but there are direct...
  3. MP1

    need help building a scmematic

    Here is a short tutorial on counters. This might help. MP Counters.zip
  4. MP1

    Your partner & supplier of all kinds of electronic components

    Do you offer free shipping? MP
  5. MP1

    lightbulb's role in car amp

    You are correct. I explained this backwards....however, the point that I was making is the change in the resistance and not whether it goes up or down. Yes, I did have to look up my old ALC design. Looks like I described my later design with LDRs. Thanks for catching it, though. MP
  6. MP1

    simple amplifier circuit.

    rian, Check out this site for more info: http://www.hut.fi/Misc/Electronics/circuits/microphone_powering.html#electretintro MP
  7. MP1

    60W Bass amplifire

    If you have double checked all connections, you might want to ask the author directly. I know he bench tests all of the circuits he posts. He can be contacted at: http://www.redcircuits.com Please let us know what you have found. MP
  8. MP1

    Waterproof??

    If the speaker /buzzer is waterproof, this helps. Then you only have to keep the circuit board dry. There are three options. 1. Conformal coating. You can dip your electronics in this solution and allow it to dry. After it is completely dry, you will have a sealed device. This will not work if...
  9. MP1

    Purchasing logic ics

    Jameco is a good source. Other inexpensive sources are: Circuit Specialists: http://www.web-tronics.com/index.html Mouser Electronics: http://www.mouser.com Newark Electronics: http://www.newark.com Electronic Surplus, Inc.: http://www.electronicsurplus.com All Electronics...
  10. MP1

    STi5518 Datasheet

    As I understand it: The manufacturer considered it to be proprietary information and had mixos remove it from the site. Contact hotwaterwizard directly and he can send it to you. MP
  11. MP1

    Alkaline Charger??

    I agree with the post by ante. I have seen nothing but problems with these. Do not use the NiCd project for Alkalines. MP
  12. MP1

    Scientific American Projects

    Yevgeni, Please feel free to attach the pdfs to posts. As many as you would like. This forum has a large audience. I am sure they will all be enjoyed by someone. MP
  13. MP1

    Waterproof??

    For a weatherproof container, the holes should be facing down. On the inside of the case, put a piece of cloth, thin padding, or other material that will allow sound through it. This should be placed (glued?) against the pvc where the holes come through. If the water gets in the holes, the...
  14. MP1

    60W Bass amplifire

    1. Are you using a heat sink? You should check the data sheet for this part and see at what point you must have a heat sink. 2. Assuming you are using a heat sink, check for shorts or a part with wrong value, etc. 3. Did you substitute any parts? Use different values, etc? MP
  15. MP1

    Voltage source at 60 Hz

    ...and the current requirement? MP
  16. MP1

    Bridge rectifiers

    Why not use a window comparator type circuit? You can adjust the ON limit and the OFF limit. Actually, if you are dealing with any substantial amount of current, you will probably use the window comparator circuit to turn a transistor on and off. One example is below: MP
  17. MP1

    lightbulb's role in car amp

    ...further to ante's answer, the resistance of the bulb changes as the voltage changes. More voltage across the filament causes the bulb filament to heat up and the resistance across the filament goes down. Seems they wanted a variable resistance to ground in parallel with this capacitor. (As a...
  18. MP1

    wil this work ok?

    Kevin, I think the point you are making is: If you have power supply ripple getting past the regulator, you should increase the *input* side cap, not the output side. The output side of a reg should already be a very low impedance, and adding caps to it beyond that needed to suppress HF noise...
  19. MP1

    European applience in North America, question

    Sasha, No one can answer this question without actually seeing the circuit. A 220 volt heating element should have no problem running on 230. Also, the frequency difference will not matter to the heating element. However, if this device has other circuitry where the voltage is stepped down with...
  20. MP1

    Car battery..........

    yourwins, What are you trying to accomplish? Are you needing a current limiter so as to not exceed 30 amps to something connected to this battery? Please state what you want to accomplish and I am sure others will be able to help with the circuit. MP
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