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  1. Arouse1973

    OP AMP comparison,

    Couple of questions, the values you give for inductance and capacitance work out to be resonant at 169Khz, is this correct? Also the nand gate has a low threshold of 1.8V and a high of 3.3V. With no input will the gate not be in an indeterminate state if set to 50% of the supply. That's...
  2. Arouse1973

    impedance of a constant current source

    That's only constant current if you don't change the resistor value. If you want constant current you have to connect the LED's cathode and emitter resistor to 0V and use the collector as your sink pin for the current. I would not use LEDs for the reference as the voltage drop is not very well...
  3. Arouse1973

    Diode and Capacitor [Basic Questions]

    Do you have an example circuit. There are many astable circuit configuration. Adam
  4. Arouse1973

    Adjustable Voltage Regulator

    I thought you wanted 6V not 9V. What voltage do you want out? Thanks Adam
  5. Arouse1973

    Adjustable Voltage Regulator

    Yes the circuit is fine but the formula is wrong to his component labels I think. Can you look again. It's a give away when Iadj is apparently flowing in his top resistor. Thanks Adam
  6. Arouse1973

    Adjustable Voltage Regulator

    No read my post again. The labels R1 and R2 are wrong to your formula.
  7. Arouse1973

    Snowstopper

    Boeing do a bambini 47 sub-atomic weeney rectifier. Also known as a Boeing 747. You get inside and diverts you away from the snow to somewhere nice and warm. I'll see if I still have the plans, you can get most of the parts from eBay I think. Adam :)
  8. Arouse1973

    Phase shift full bridge SMPS problems?

    Look up EMC issues and noise. I think you will find they are better.
  9. Arouse1973

    OP AMP comparison,

    Can I ask for a bit more detail, what are the input levels and frequency and inductance value and what is the output you require. It looks like some kind of coil pickup. Is this supposed to be a differential amplifier? Adam
  10. Arouse1973

    Adjustable Voltage Regulator

    I think you have your formula wrong. You need to swap the R1 and R2 designators around if your going to use the standard formula shown. so for 6V out it's this. Vout= 1.25*(1+2000R/540R)+(50uA*2000R) = 5.98V. So it's your R1/R2 not R2/R1 and also Iadj*(your R1) not R2. Adam
  11. Arouse1973

    Help Designing Flow Sensor Circuit

    Put up a copy of the circuit so we can have a look out of interest.
  12. Arouse1973

    MOSFET protection help.

    In this instance you might be better off using an MOV where the diode is now. Look at this sort of thing. http://www.newark.com/bourns/mov-20d180ktr/varistor-metal-oxide-18v-20mm/dp/52W8481 Adam
  13. Arouse1973

    Voltage Regulator +Negative Voltage Generator

    Ok Cool
  14. Arouse1973

    Help Designing Flow Sensor Circuit

    This might work. Choose R2 and C1 for your time constant. Adam
  15. Arouse1973

    Large DC voltage at opamp inputs?

    These devices appear to have a balance pin. Have you terminated this properly. And as Harald says you could have stray currents somewhere. You have either current being pushed into the inverting terminal or current being pulled out of the non-inverting terminal. Re-check you wiring on the...
  16. Arouse1973

    MOSFET protection help.

    The first negative pulse coming out of the coil is going to be clamped by the diode. The Transorb will only conduct if it has a lower trigger threshold that the diode which I doubt very much. The diode should have a peak current handling of greater than the current flowing in the coil. Bear in...
  17. Arouse1973

    Voltage Regulator +Negative Voltage Generator

    Been looking for something like that myself John. I Can find one either, I asked Linear Tech and they said no never been asked for that before??? Let me know if you find something. I'll have another dig about also. Adam
  18. Arouse1973

    How to charge a 7.5v battery from a mini-wind generator of 12v?

    Absolutely Harald. It is very very dangerous to do what you are doing. Lithium batteries generally require a constant current / constant voltage charging system. They start off with a constant current and finish charging with a constant voltage and when the current is about 3% of the maximum...
  19. Arouse1973

    Meat Balls

    Loving it Guys, what a great sense of humour you all have. :)
  20. Arouse1973

    Meat Balls

    Brilliant Steve. :)
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