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  1. Arouse1973

    Successive approximation ADC

    It's 12 bit so the next bit down is the 11th bit not bit 1. If it makes it easier start from 0 --------> 11. Every time you set a bit starting from zero it increments 244 uV.
  2. Arouse1973

    Minimum current for micro controller

    Not that I know of, why do you ask? Adam
  3. Arouse1973

    Successive approximation ADC

    If Vin is greater than half Vref (1 Volt) then MSB is set. This is then subtracted from the input voltage and the value checked again to see if it's higher than a quarter of the reference voltage. It then carries on until all the bits have been checked. Adam
  4. Arouse1973

    Successive approximation ADC

    No it's divided by (2^12) or 4096. I should have made it clearer. Adam
  5. Arouse1973

    Compact AA voltage booster

    That's a neat idea, I like that.... Although I rarely use bread board these days. Will it work with Vero board? Adam
  6. Arouse1973

    Successive approximation ADC

    Hello The resolution of the A/D is the reference voltage (1V) divided by 2 raised to the power of the number of bits. In this case it 2^12 = 4096. I believe the SAR takes as many approximations as there are bits to perform a conversion. So a 12 bit won't be as fast as say an 8 bit but it will...
  7. Arouse1973

    Transistor hfe

    Ok so I have had a reply back from the guy at Linear Tech. Basically he is saying that the transistors are not turning off fully to allow the regulator to reach regulation say you have a 1K load. This is the start up current causing the transistors to turn on. Unfortuanatly he didn't go into any...
  8. Arouse1973

    Bose Car Amplifier Repair?

    Hi John I would have a little clean first with some PCB cleaner. Might not be anything wrong with the IC or diode. Then have a look and replace if you feel it needs it. Cheers Adam
  9. Arouse1973

    Can anyone identify this component

    Ok yep agree Dave. So it looks like a rectifier of some kind. One like this maybe? http://www.onsemi.com/pub_link/Collateral/MBRB20200CT-D.PDF Adam
  10. Arouse1973

    Can anyone identify this component

    Have a look at MJD200G, It could be this part. http://www.onsemi.com/pub_link/Collateral/MJD200-D.PDF Thanks Adam
  11. Arouse1973

    Transistor hfe

    I hope the guys at Linear come back with something. Otherwise I will start my own research on the issue. Up until now it's all been educated guesswork. But it will be good to have a definite cause from the guys who design these things. I'll keep you posted. Adam
  12. Arouse1973

    Transistor hfe

    I think it's basically the transistors switching on faster that the regulator has time to settle. When the regulator first powers up the output tracks the input and current limit is at it's maximum. This allow the regulator to supply heavy current on power up. Now in your situation the regulator...
  13. Arouse1973

    Transistor hfe

    Ok I think I have found the issue. It a start up problem. If you give the regulator time to stabilise by adding a RC network after the collector of the pair it works with a 100R. So it must be that the regulators are sensitive to this. This is new to me so I am glad I now know. I think I will...
  14. Arouse1973

    Transistor hfe

    Ok I have managed to simulate your findings. But I dont know why its doing it at the moment. If I connect a 6K8 resistor on the input to the reg, I get 17 Volts on the output. If I then change the 100R to 47R it works. It maybe a start up thing but not sure. The 100R should be able to supply...
  15. Arouse1973

    Transistor hfe

    Thats good work, I will have a look at this later today. Adam
  16. Arouse1973

    Device that will allow specified voltage to pass through for a specified amount of time?

    Yes agreed. Adam
  17. Arouse1973

    Device that will allow specified voltage to pass through for a specified amount of time?

    Mono-stable is what I think you are after. You just need to tell us what voltage you want. Adam
  18. Arouse1973

    Confusing results from voltage amplifier circuit

    No probs
  19. Arouse1973

    Confusing results from voltage amplifier circuit

    Hello, welcome to EP. So what is your problem please? Adam
  20. Arouse1973

    Embedded microcomputer software structure

    Sounds like a job for RS485. They don't give you much info do they? So is the data and the analogue values the same thing or separate? Adam
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