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  1. MP1

    555 timer switch sequence

    Here is also a good link to a 555 tutorial if you want to learn more about the capability of this chip. Have fun! http://www.meridianelectronics.ca/gadgets/555/555.html MP
  2. MP1

    Unipolar Stepper Motor Controller using UCN5804

    I was looking at the following project: http://www.electronics-lab.com/projects/motor_light/004/index.html and in comparing the data sheet with the project schematic, it appears that there is an error. Pins 2 and 7 of the chip are internally grounded. Therefore resistors 1 and 2 are in the...
  3. MP1

    555 timer switch sequence

    The attached pdf file might get you started. This is 555 timers. There is a similar relay example in the doc. You will have to calculate your time constant with the formula provided. MP Timer_Circuits_-_555.pdf
  4. MP1

    LM317 Variable power supply

    You cannot get more current out of this one than the spec. You can, however, put two of these is parallel and get more current out. Also depends upon what you have available on the input side. As far as the build instructions, there is no difference. MP
  5. MP1

    old car dashboard gauge repair instruction books

    I think this site has a book that deals with this subject. http://www.looksees.com/car-repair.html MP
  6. MP1

    Electronic circuit box designs etc

    Steven, do you have a picture that you could upload to the group? It would be great to see the finished product. MP
  7. MP1

    Capacitane switch

    Normally, you would use ADC converters for connection to a microprocessor. There are many documents regarding ADC conversion with a search on google. I would recommend that you use a pulse to voltage converter and use the voltage to trigger your relay from a set point. (less circuitry involved)...
  8. MP1

    Open Schematics from the web

    I do not have protel, but it might be that you save the file, then change the extension to whatever it is for protel schematics. MP
  9. MP1

    Homemade metalic discharge globes

    Steven, I have seen several posts from you regarding the projects you are working on. Why don't you upload them to the forum? I am sure several others will be very interested in them also. If the upload area is not up, you can e-mail them to Mixos on this site. MP
  10. MP1

    Capacitane switch

    Yes, Like I said on the 18th, "...of course, there is also the old standby. A small float connected to a switch that activates a relay." This is much simpler to do. And you do not have to use metal parts for the float as Steven has indicated. Good luck with your project! MP
  11. MP1

    proportional temperature controller

    I think we need more information. You know a continuous 240 VAC at 20 amps is 4.8 Kilowatts don't you? You could burn down your house with this much power dissipation. Be careful. MP
  12. MP1

    Capacitane switch

    I looked around to see how others have done this. Here are a couple of links: http://www.parallax.com/dl/docs/cols/nv/vol1/col/27.pdf http://hawthorn.csse.monash.edu.au/~njh/electronics/watersensor/ These do not seem to be real simple switch methods, but might give you a platform to build...
  13. MP1

    Capacitane switch

    Alternating current will also corrode. :) MP
  14. MP1

    how can i find...

    You will need about 185 feet of wire. (The short answer). ;) MP
  15. MP1

    Capacitane switch

    I am not really following the change in capacitance theory on screws coated with plastic, but you did make me think of some other ways to accomplish this. You can use a pressure sensor with a tube from the transducer to the water. As soon as the water falls below the end of the tube, the...
  16. MP1

    cunonstant current load

    Then you are probably looking for application using a Transconductance Operational Amplifier (OTA) such as the CA3080A or similar. This device can be used like a variable resistor by the control pin. It is used widely in music applications for effects filtering circuits and VCA applications. MP
  17. MP1

    Hameg HM205 Oscilloscope Manual

    Yes. Believe it or not, they 'did' have this technology in 1984. ::) My scope is not much newer than this. How time flies, huh? MP
  18. MP1

    Monitor's Led blinking

    Did you also see the other post in this area regarding where to get monitor schematics? MP
  19. MP1

    Monitor's Led blinking

    I would suggest finding the schematic and check the voltage from the switch to the internal board. You need to know what the LED is connected to. If it is connected to the power supply, then it could be a power supply failure; even a bad on/off switch. If the LED is connected to the processor...
  20. MP1

    cunonstant current load

    I hope I am not misunderstanding you, but ohm's law is the rule no matter what the circuit is. V/R=I. You must take into consideration the resistance of the total circuit. If the resistance of your circuit changes or the voltage changes, then the current will change according to the formula. In...
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