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  1. MP1

    produce electricity using quartz cristals...

    Siddu, this is very interesting. Do you know of a website with more information regarding this? Any schematic examples of designs used to do this? MP
  2. MP1

    Capacitance meter

    Yes, and please do not forget the one right here on this website.... Uses a 555 timer IC. http://www.electronics-lab.com/projects/test/006/index.html ;) MP
  3. MP1

    Labeling the project box

    Here is an update: VPC has it. From their description: ***3M discontinued Dynamark.*** Quick-Mark Quick-Mark has replaced 3M's Dynamark as the preferred method for short run, rapid, in-house production of durable, self-adhesive signs, placards. Quick-Mark is UL approved and is used by NASA on...
  4. MP1

    Need Datasheet for Sunplus SPCA711A

    Doom.com charges $50 per month for membership before they will allow you the information... :o Anyone have an account there? MP
  5. MP1

    5 volt regulated power supply HELP!!!!

    I do not think this is what they were referring to. I think it is a question about the LMXX schematic. However, I have not seen very many tansformers with a secondary of 7 volts that have much current rating. If current is a consideration, then perhaps we should know the current needed of this...
  6. MP1

    LM317 Variable power supply

    They are test standards of the parameters used by the chip manufacturer. Your application might very well be different. If your application falls within the generic specs, then sure. If you are pushing the edge, then you have to look closer. You can still achieve the manufacturer's specs if you...
  7. MP1

    my first design.. pls help

    Here I have made a small change on your board layout. MP
  8. MP1

    my first design.. pls help

    The 0 or center tap of your transformer should be connected to the ground or minus side of your output as well. MP
  9. MP1

    Big Datasheet Database!

    Wow! Nice Find. MP
  10. MP1

    5 volt regulated power supply HELP!!!!

    If you are looking for simple....
  11. MP1

    PCB Etching Tank - Do it yourself

    Nice pdf file, Billy. Looks just like mine on a smaller scale. You might want to add a bit of a warning in your article about heat. The best etch is done with the highest heat of the etchant, with one exception. Above a certain temperature, the etchant chemicals become airborne. Eveything in the...
  12. MP1

    help about inverters

    If you want 220 instead of 110, you can use a voltage doubler circuit after the transformer to achieve this. This is just diodes and capacitors. Mixos has posted a diagram somewhere on this site with a schematic for voltage multipliers. ...or just use a different transformer that will give you...
  13. MP1

    LM317 Variable power supply

    I actually have two data sheets on this device. One from BayLinear and the other from National. The National Data Sheet is dated May 2003. Both data sheets list the same specs. 3.5 mA as Typical minimum load current "Min". The BayLinear Data Sheet lists the Minimum load current" Max" as 5 mA...
  14. MP1

    Data Sheet K818, K819 and BD705, BD708

    Thanks John. That should get me started. I appreciate the help. MP
  15. MP1

    transformer core

    I think that would be a question for Jan, the author of the Transformer information in the Articles section of this site. I believe he has made the offer to help in another post somewhere on this forum. You can send him a message in this forum. MP
  16. MP1

    transformer core

    http://www.electronics-lab.com/articles/transformers/index.html MP
  17. MP1

    Data Sheet K818, K819 and BD705, BD708

    I have exhausted my sources for a cross on the above mentioned transistors. Any help would be appreciated....or if anyone knows the specs, I can find something similar from this information. Again, any help would be much appreciated. MP
  18. MP1

    A (simple) question about PSU

    First, I will have to assume you are talking about a power supply with AC output, since such a filter will do nothing with DC. Secondly, the frequency and phase of the circuit really are not relative to the voltage since they are related to the timing and lag of the signal whereas the voltage is...
  19. MP1

    LM317 Variable power supply

    Yes, the feedback resistor determines the current. A little about this can also be found in the LM317 data sheet. I am glad to hear that all is well. MP
  20. MP1

    negative impedances

    It is a little more complicated than that and the cure is dependent upon the characteristics of your circuit. It is a well discussed topic and I am not an expert on it. Using the search words, "compensate negative impedance", I find 83 pages of articles on google.com . Many are pdf files with...
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