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  1. MP1

    Electronics Magazine

    You should post your electronic magazine requests in the Electronics Resources forum on this site. You will get much more exposure in that forum. MP
  2. MP1

    car battery tester

    Well, I guess he did mention something about ineptitude...  ;D MP
  3. MP1

    car battery tester

    It says in the text of the project that it is a voltage monitor. I don't see anywhere in this topic where rabid wants anything more than that. If you are offering him an alternative....post it. MP
  4. MP1

    plz do reply

    Something like this? MP
  5. MP1

    MOVED: wild life watching -wireless night vision quetions

    Posted in wrong forum Moved to: http://www.electronics-lab.com/forum/index.php?topic=7178.0
  6. MP1

    circuit design

    Normally, you would use more current when loaded heavily. I am not following why you think you have a current limiting problem since two out of three of these circuits are working fine. Are you able to take a picture of your project? I was thinking the problem might be due to lack of heat sink...
  7. MP1

    car battery tester

    What would be the point? This one is no different than the voltmeters in the dash of cars. When you suggest that someone scrap their project, you should post the replacement that you are suggesting. Thus, a comparison can be made. MP
  8. MP1

    pnp vs npn?

    Yeah, but indulis is a lot closer to helping andrie use his mind in the right direction.  (right potential?  ;D )  Both circuits could float, etc. andrie: as you can see, it is not so basic. Go to the Electronic Resources forum on this site and download the free transistor theory books posted...
  9. MP1

    LED display voltmeter

    Are you building this one? http://www.electronics-lab.com/projects/test/007/index.html You just need to rectify the input with diodes just like you would with any circuit. Just diodes and a cap for ripple. Then adjust the pot so that it reads correctly. MP
  10. MP1

    circuit design

    You should use heat sinks on all of your L298 chips. Please refer to the data sheet for information regarding this. They run hot. In fact, I was just looking through the data sheet and found that you should not exceed 2 amps unless you use a bridge configuration (figure 7).  You should read it...
  11. MP1

    circuit design

    Leaving pin 8 open should not have caused a problem. There must be something else also wrong in the circuit or it is possible something touched a pin that caused a power surge to the chip. Perhaps you had one component that was wrong in this one circuit that was different than in the other two...
  12. MP1

    Knight Rider with Halogen Bulb

    I have to agree with Windoze, I don't like to add power transistors to car circuits. Especially where there will be multiple sets of this circuit. The Emergency Response agencies have already figured this all out. They use lots of blinking bright lights. They use relays to make these blink. If...
  13. MP1

    MOVED: PCB Design

    Since the topic was more to do about PC Board design than Circuit Request, I have moved it to Spice Simulation - PCB design. Please follow the conversation here: http://www.electronics-lab.com/forum/index.php?topic=7094.0
  14. MP1

    PCB Design

    Zak, it looks good. Nice ground plane and the traces look like they are far enough apart so that they will not cause interference. I was not able to check your schematic against the board layout, but the layout itself looks well done. MP
  15. MP1

    circuit design

    Possible. Which pin? Was it shorted to another pin or left open? MP
  16. MP1

    circuit design

    I would look to see if there is anything different on this circuit than the other two. Perhaps you ran a wire wrong or a component is different. This type of error is the most common. Can you post pictures and diagrams? It is hard to guess what might be the problem. Did you heat sink the driver...
  17. MP1

    DRC and net list

  18. MP1

    Soldering: what am I doing wrong?

    I use the Kester brand. Not sure if it is the same, but here is a picture and what it is made of... MP
  19. MP1

    Electromagnetic field interference.

    No myth...just "Common" sense  ;D That is what I said...a "Common" point. You do not have ANY point that is considered to be a "Common" point in this diagram. All systems are acting independently of each other and thus, they are all doing their own thing....not working in unison, if you will...
  20. MP1

    Paint &electronics.

    Wouldn't you have to keep up the bluing from time to time? Not trying to give you a hard time. I just do not know anything about gun bluing. I thought that this was not a one time process; that you have to continue to blue it from time to time. MP
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