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  1. Arouse1973

    UV Light box design

  2. Arouse1973

    UV Light box design

    Hi dalpets. It is really important to supply enough information so we can help. It was a genuine statement and not a late night throw away line as you put it. Which is why I wrote the rest of it. The thing is if we advised you incorrectly because of lack of information and you ended up damaging...
  3. Arouse1973

    Help needed for 12V lead-acid switched mode battery charger.

    Yes correct, but I would leave it for the moment. There are a lot of variations in core manufactures and quality. The gap reduces the inductance of the coil which counteracts the difference in the quality of the core. Wind two different cores with the same number of windings and they will have...
  4. Arouse1973

    UV Light box design

    Hello dal pets, lets get one thing straight here Bob is a very experienced member of this forum and he was only trying to help you by saying that there maybe an alternative method to what you are trying to do. But I guess from your response to him that you feel passionate about getting the LED...
  5. Arouse1973

    Help needed for 12V lead-acid switched mode battery charger.

    Hi OhMy I believe most ferrite core applications will need that gap. You need to look up your type of core N27. Different material will require a different gap. The gap is there to help to reduce core saturation from the magnetising flux. It also helps to even out manufacturing tolerances in...
  6. Arouse1973

    driving analog frequency through a digital component

    All signals are analog. As Bob Dobkin (CTO Linear Tech) said digital is just fast analog. Apart from certain micro processor inputs, is there a minimum time for a digital gate to switch? Adam
  7. Arouse1973

    Need help with a radio project!

    Hi django What do you mean mix my stereo into mono. I thought you wanted stereo? Or am I missing something. Cheers Adam
  8. Arouse1973

    Help needed for 12V lead-acid switched mode battery charger.

    Well done mate good to see a real project in action. Adam
  9. Arouse1973

    ECG circuit design

    As a PQRST responce that's not bad. The P and Q are a bit low and theT is too high. But very good. Adam
  10. Arouse1973

    Phototransistor question

    To speed up opto couplers I think you need to apply some base bias if you can connect to the base terminal. Adam
  11. Arouse1973

    Custom PCB

    For UK either PCB Pool or PCB train. You can order online with PCB train and up load gerber all in one. They will also assemble tricky parts for you like SMD components and all SMD caps and resistors are free. I have used them for many years. Adam
  12. Arouse1973

    Op Amp Stability

    Yes valid point Lvw. I am just used to working with d.c where this configuration is how it is mostly done, for as you say non a.c signals. I'll make a mention to this in the thread or change to split supply and then add some additional stuff on single supply operation to include this buffer...
  13. Arouse1973

    Looking for a good simulator

    I like Tina from Texas Instruments. Adam
  14. Arouse1973

    Phototransistor question

    Hi Rick When you say more sensitive. What do you mean? Do you want to increase the range between TX and RX or a faster response? Adam
  15. Arouse1973

    Op Amp Stability

    Hey Lvw I thought I would use the most common configuration of buffer seen in most text books and that is single supply operation and I figured most people would use this to buffer voltage higher than the common mode limit? Is this what you mean. Would you like me to mention about the...
  16. Arouse1973

    Op Amp Stability

    I have added something on buffers now. Thanks Adam
  17. Arouse1973

    increase pulse voltage

    Can we have an updated circuit diagram if there has been any changes. Where are you taking this measurement from? What do you have connected on the output is it just the scope?
  18. Arouse1973

    Is anyone using DesignSpark PCB?

    Sad to say I used It when it first came out. I found it a bit non intuitive as Kris mentioned. But using another program at work I didn't carry on.
  19. Arouse1973

    Measuring Batteries in Series

    Neat idea isn't it? Adam
  20. Arouse1973

    Measuring Batteries in Series

    I was involved in a recent thread regarding measuring the individual battery voltage of series connected cells. The original OP didn't have the experience to design or construct anything too complex, so he was looking for an off the shelf solution. Nothing could be found so he opted for taking...
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