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  1. Arouse1973

    Deer repelling sprinkler

    Render dont you mean reindeer :) sorry couldnt resist that. What can the sensor interface to. Do you know what type of output it has? Adam
  2. Arouse1973

    Help making pcb for this camera

    What is the pitch between the pads on the camera? Adam
  3. Arouse1973

    Homemade Battery monitor for 4 x 3.2V cells

    I like number 2, only because I posted this a while ago on another post. Measuring lots of series cells can pose issues with high common mode voltages. Adam
  4. Arouse1973

    Extending IR receiver

    The purpose of twisted pairs is to keep the induced noise common mode. You will get some cancelation because of the twists but anything that get through will be seen as common mode noise and should be dealt with by the receiver. Shield just help to limit the amount of induced noise. Adam
  5. Arouse1973

    Homemade Battery monitor for 4 x 3.2V cells

    But if you only have 12V how do you plan to measure upto 13V. Will you be using the potential divider mentioned in your first post? Adam
  6. Arouse1973

    Homemade Battery monitor for 4 x 3.2V cells

    The link works for me?? Try this Kris. http://www.szsunyuan.com/uploadfile/2012/201212/ISO%20V-4-20mA.pdf
  7. Arouse1973

    Homemade Battery monitor for 4 x 3.2V cells

    What battery type are you using and what capacity. Thanks Adam
  8. Arouse1973

    Summing amplifier

    Yes that makes sense Lvw. I see it now. Adam
  9. Arouse1973

    Summing amplifier

    Hey Lutz Yeah I wondered that. Adam
  10. Arouse1973

    Single Transistor FM Receiver

    This looks a bit strange to your norm. But it looks like a regen receiver, the basic types are a bit old fashioned. This is because the feedback used to to radiate back out the antenna unless you had some buffer on the input. I dont know the correct answer but I would try 4 turns of say 0.5 to...
  11. Arouse1973

    Summing amplifier

    Depends on the value of the other two. Vout would be your new V1, so this would add to the others. So I think what you will get is V2+V3+V2+V3. But thats a strange question so I might be wrong. But I think it would soon saturate. As it kept adding. Adam
  12. Arouse1973

    Hi all!

    Well what a bloody good idea to join us. I have looked at many forums and this ones feels like home, this is why I keep coming back. The main thing you will notice is that we are normal people willing to help, not stuck up our own bums like some. The guys on here have a wealth of info about them...
  13. Arouse1973

    SCR activation question

    No probs Daniel, nice to hear what your doing with them. Dont see them much now. Adam
  14. Arouse1973

    5 V to 1.7v (in SPI)

    Oh ok one way comms makes it much easier then :) Adam
  15. Arouse1973

    Controlling LEDs using the serial port

    This is how the PC converts the data you want to send into a serial stream of bytes. After all it's a serial port. The limitations of the serial port is speed which is where the other standards come into play. With the ever increasing amounts of data being used today and our ever decreasing...
  16. Arouse1973

    Free samples from semiconductor Mfgs

    But do this too often they might get wise and stop it. But keep going until this happens, if it ever does :) Adam
  17. Arouse1973

    Bending Radius of Lead when designing component footprint

    IPC-A-610 Rev D 2000 Section 7.1.2 Component mounting and lead forming. States: Leads for through hole mounting must extend at least one lead diameter or thickness but no less than 0.8mm (0.031in) from the body, solder bead or lead weld. Thanks Adam
  18. Arouse1973

    5 V to 1.7v (in SPI)

    It might be better to use a PIC16LF877 that can run from 2.4 Volts otherwise you are going to need a bidirectional level shift circuit of some kind. You can't put 5 Volts into a controllers input pins unless this is allowed, which I doubt very much. Adam
  19. Arouse1973

    SCR activation question

    Sorry Kris and Max I didn't read the question well enough. The SCR is like two diodes in series the PN junctions should act just like a diode. So the dynamic resistance will vary depending on the current the device is supplying. So for a silicon diode the resistance with 1mA of current is...
  20. Arouse1973

    Wireless remote bell push to ring wired bell system

    Oh ok you can get wireless extenders and extended chimes, I did look at this but wasn't sure you would want to fit a new door bell. Kris's idea is not a bad one if you are willing to do a bit of wring etc. Adam
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