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  1. Arouse1973

    Help with a project... board question (HDMI to ribbon cable)

    I wouldn't like to comment to be honest. Adam
  2. Arouse1973

    Help me finding capacitor

    ESR is frequency dependant so unless your frequency matches the data sheet test frequency you will get different results. ESR goes down with an increase in capacitance. So if you can go up in capacitance your ESR will go down and then you might not need a special capacitor type. Adam
  3. Arouse1973

    Measuring temperature and humidity

    What research have you done . What are you transmitting to? What RF bands are you allowed to use in your country, if you don't know then I suggest 2.45 GHz global ISM band. What range do you want? How big are the batteries and how long do you want them to last. How much do you want it to cost...
  4. Arouse1973

    Generate trapezoidal waveform for high power amplifier

    Good one Kris. Yeah what slew do they want, adjustable mark and space also? Adam
  5. Arouse1973

    Boom gate for car park

    Do you want to monitor the cars or the button. There is a difference. For actual car monitoring you would be better opting for an inductive sensing circuit that monitored the presence of the vehicle and the button press. If it's just the button monitoring and the assumption that a car has passed...
  6. Arouse1973

    Can this circuit works What changes I have to make to Drive 1w Leds on same circuit

    Looks like the LEDs don't have any current limit in the diagram. Is that right? Adam
  7. Arouse1973

    Help understanding solar lamp circuit

    Beat me again Kris :)
  8. Arouse1973

    Help understanding solar lamp circuit

    Bobs right! They often do this to run LEDs from 1.2 Volts. The upside down circuit takes some getting used to. Could someone turn it around? Adam
  9. Arouse1973

    need help fixing my record player

    Ok Ok I am going to ask, have you checked for any blown fuses? I guess you have. When was it last working? Has it been stored for a long time, anyone drop it by accident? Adam
  10. Arouse1973

    Help with a project... board question (HDMI to ribbon cable)

    Try Alibaba you might be able to get small MOQs or at least search for the name of the LCD. Might have some useful information also. http://www.alibaba.com/hdmi-lcd-module-promotion.html Adam
  11. Arouse1973

    4-20mA using XTR111

    Ok I see it now. It should be this from HERE marked on original post. 0.4=m+3b b=0.133 Put this back into the first equation (0.4=m*0.5+b) 0.4 = m*0.5+0.133 m=(0.4-0.133) / 0.5=0.534 Sorted! Adam
  12. Arouse1973

    Stranded Hookup Wire and Logic Circuits?

    Another point if they are selling them for the use on Breadboards, and trying to poke stranded wire into the little holes. This could cause the small wires to fray out and possibly cause faults on the breadboard making it difficult to find this stray wire. Adam
  13. Arouse1973

    4-20mA using XTR111

    Oh Sorry I didn't show how to get m without knowing any values. It uses simultaneous equations of a straight line graph. You can do this because the op-amp is linear as it is configured. You have two Vouts 0.4 V and 2 V and two Vins 0.5 V and 2 V Vout = m*Vin+b 0.4 = m*0.5+b 2 = m*2+b...
  14. Arouse1973

    Stranded Hookup Wire and Logic Circuits?

    Hi chopnhack The only reason I can think of is the flexible nature of the wire could mean they all touch. This would create capacitance between the wires causing interference. I can't see of any other reason. The other guys might know more Just a thought.
  15. Arouse1973

    4-20mA using XTR111

    Here's my attempt at it. God I hate rearranging formulas :) So I am guessing you chose the 120K first, and kept the value for RF low for stability purposes. And you knew you wanted 1/2 supply so the RABP(RA||RB) value is just 60K. Obviously standard values might of swayed you to your choice in...
  16. Arouse1973

    Capacitor discharges rapidly

    Why do you think it's the capacitor. There are other components that will cause a faster discharge that makes it appear as if the capacitor has lost capacitance. I think high pressure effects carbon resistors and it may well reduce the value, but I would have to look into this. Are you using...
  17. Arouse1973

    4-20mA using XTR111

    Ok I'll have a look. Cheers Adam
  18. Arouse1973

    common emitter amp design

    Simulations, real life and calculations will all have variations but 9 mA out seems quite a bit. Can you show us your calculations. Adam
  19. Arouse1973

    Two inputs simultaneously

    I removed one doped piece of N type silicon and one resistor :)
  20. Arouse1973

    New toys

    Ok I am Old, I am over 30 lol. What is 5 subject note book? I assume you program the bigger units is it not the same. Are they like the raspberry pie. Adam
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