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  1. Arouse1973

    Opamp to pic a/d

    You can't exceed any of the limits on any ports. You need to read the data sheet to find out what you are allowed to do with each port. Adam
  2. Arouse1973

    Opamp to pic a/d

    I thought you could measure negative voltages if your PIC has a -Vref pin. As long as you don't exceed the voltage range of the A/D then it should be fine. You will have to do some math in the software because if you have a reference supply of say +/- 1.5 V then at 0 V in the A/D will read half...
  3. Arouse1973

    Bit of quiz fun

    Yes I know. I am a qualified car mechanic also :)
  4. Arouse1973

    Bit of quiz fun

    It doesn't include the mechanical geometry. It's just the pattern. Like this pictures also.
  5. Arouse1973

    Bit of quiz fun

    It's the gear pattern in a manual car. R is for reverse :)
  6. Arouse1973

    RF balancing (50 ohm traces, baluns etc...)

    The first matching circuit is used to match the output of the device to the Balun. The Balun then converts the double ended balanced signal to an unbalanced signal both inputs and outputs need 50 Ohms matching. The other inductors form a PI filter and you would use them to match also. It's...
  7. Arouse1973

    RF balancing (50 ohm traces, baluns etc...)

    Sometimes you have to make sure you match the trace impedance to the load. This is normally done by the PCB manufacturer. But you have to tell them to make a particular trace say 50 Ohms. This will ensure maximum power transfer for that particular output. We need to see the PCB design files if...
  8. Arouse1973

    Bit of quiz fun

    R? Thanks Adam
  9. Arouse1973

    What is this SMD component?

    It might be a polyfuse? They often have a letter printed on them. See link. https://www.ebay.com/itm/10-Pcs-Littelfuse-SMD-SMT-PPTC-POLYFUSE-Resettable-Fuse-1206-0-25A-250mA-16V-/171615677010 Thanks Adam
  10. Arouse1973

    Help understanding solar panel and li-ion chargin

    The solar panel charges the backup battery and then you connect the battery to be charged to the backup battery using its charger. You will need a dedicated battery charger for the back-up battery i.e lead acid charger. Thanks Adam
  11. Arouse1973

    Help understanding solar panel and li-ion chargin

    Why don't you have a support battery like a lead acid type to buffer the current from the solar panel. This will give you a steady supply of energy if the solar panel were to output less energy due to partial lack of the sun. Thanks Adam
  12. Arouse1973

    Free online textbooks and video lectures

    Ok no probs, what you are doing is great, I wish I had this sort of thing when I was learning electronics. But as you know all components are susceptible to ESD damage, just thought I would mention it. Cheers Adam
  13. Arouse1973

    Free online textbooks and video lectures

    I watched your video on transistors which is ok ish. It would be worth pointing out about ESD precautions when touching semi conductor devices and that this is just a demonstration. Thanks Adam
  14. Arouse1973

    Free online textbooks and video lectures

    This sounds good Robert. I might just take a peek :) Adam
  15. Arouse1973

    Bitwise AND assignment

    Yes correct, that operation clears the 4 left bits but retains the right 4 bits. Thanks Adam
  16. Arouse1973

    Hello.

    Hello Mig192, welcome to EP. Adam
  17. Arouse1973

    Brain storming layout for safety lighting circuit. Help.

    Hello A voltage regulator would be needed to drop the voltage down to say 3.3 Volts to power the micro. You could then use a logic level MOSFET to switch on the LED bars. Thanks Adam
  18. Arouse1973

    RF sensor to detect cat

    What about a waterproof IR break beam that with detect the cat if it jumps up onto the window sill. A more advanced option would be to use a camera and some software to do pixel recognition. Thanks Adam
  19. Arouse1973

    A total beginner needs help on a simple 'beat the buzzer' project.

    Hi Jack, welcome to EP. To answer your questions. 1) No difference as long as oxidation of the wire you choose doesn't become an issue. 2) Tinned copper wire of suitable gauge would be my preference. 3) Not really, Choose wire thick enough so it maintains it's shape when being used and in...
  20. Arouse1973

    IR communication questions

    You can make your own protocol if you want, it will probably be the easiest way. Send it as short pulses with set time intervals for a 1 and a 0. Then you decode it the other end and you are done. Example could be each bit has a total time of say 1000 us and for a 1 you could send 700us on and...
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