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  1. Arouse1973

    Voltages - continuation of the discussion

    Thanks Harald!
  2. Arouse1973

    Voltages - continuation of the discussion

    Can someone link to the original thread please. Thanks Adam
  3. Arouse1973

    Lead acid battery - how long can it be left discharged?

    Yeah I agree.Also I would have thought your circuit would stop working by the time the battery is 80% discharged.
  4. Arouse1973

    Designing a four layer stack up PCB having nrf52832 SoC with chip antenna

    Show us the circuit diagram please. The rest of the circuit looks not too bad (waiting circuit diagram) You have some acid traps that need sorting also. I let you find out what that means :)
  5. Arouse1973

    Designing a four layer stack up PCB having nrf52832 SoC with chip antenna

    Turn your antenna and associated components through 180 degrees so the feed line from L1 is straight. Use this from my calculator to help you with your layout for the feed line. Thanks Adam
  6. Arouse1973

    EMI suppression

    Cool. Please let us know how you get on. Thanks Adam
  7. Arouse1973

    EMI suppression

    Here is something else that you might find helpful.
  8. Arouse1973

    EMI suppression

    It all depends on your application circuit and where the noise is coming from and its impedance. This will help you decide if you are best with a PI or a T filter topology. The inductance of a ferrite bead is not constant with frequency which is why they only mention impedance versus frequency...
  9. Arouse1973

    EMI suppression

    Hi Tim Not all ferrite beads are used in the power supply line. You find them being used on the output of digital circuits that may interface to the outside world via a cable as an example. If you just chose the highest impedance device you could find, you may have issues with insertion loss...
  10. Arouse1973

    Happy new year

    Same from me to all on EP. I hope everyone has a happy new year. Adam
  11. Arouse1973

    How to make a touch sensor replicate an on/off switch - HELP!

    So if it does it already what do you need to do? Thanks Adam
  12. Arouse1973

    How to make a touch sensor replicate an on/off switch - HELP!

    Please clarify. Press the switch once and the circuit activates, press it again and it de-activates. Or press and hold the switch and the circuit activate and release the switch and the circuit de-activates? Thanks Adam
  13. Arouse1973

    Making a set of quiz lights

    You can do this with logic gates. If you use LEDs then it makes the circuit less complex. I guess you want the light to latch on to let you know who pressed the button first? Adam
  14. Arouse1973

    One for the New Year

    I already have the worry LOL. I have AF and yes I have had two ECGs so got a rough idea of what I am looking at. The AD8232 is the type of device they use in loop recorders for monitoring your heat beat. With me I have an extra beat in my heart rhythm. The reason I am doing it is because I want...
  15. Arouse1973

    One for the New Year

    Mine is a simple one. Its an ECG using the AD8232. I have the PCB and electrodes just need to wire it up and put it in a box. Need to build a small regulator PCB as it runs from 3.3 Volts and I plan to power it from a USB battery bank. Then I can connect the circuit to my PICO scope and see my...
  16. Arouse1973

    Enlarging hole in reflector?

    Wrap some tape around the light just below where you want to cut. That will help hold it all together. Adam
  17. Arouse1973

    Enlarging hole in reflector?

    You could try a Dremel with a thin saw blade maybe? Adam
  18. Arouse1973

    Opamp to pic a/d

    You don't have to worry about the resistor values too much because you are using a buffer. In the region of 10 K will be fine. Add a small capacitor across the lower resistor to help stabilise the divider. A 1 uF should be fine. Adam
  19. Arouse1973

    Opamp to pic a/d

    It would be better to divide the voltage down with a potential divider as you mention and then buffer the voltage with an op-amp into the A-D.. Thanks Adam
  20. Arouse1973

    Thyristor question

    Look at Fig 6 graph on the data sheet maybe there you will find some useful information. Thanks Adam
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