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  1. Arouse1973

    Help figuring out this switching driver.

    I am thinking of using an IC not an off the shelf module. This should give you a bit more scope for what you want. I'll see if I can find something tomorrow. It won't be until later, so some of the other guys might beat me to it. Adam
  2. Arouse1973

    Help figuring out this switching driver.

    No they should be constant current, that's how they work mostly. Adam
  3. Arouse1973

    Help figuring out this switching driver.

    Have you considered an LED driver?
  4. Arouse1973

    Help figuring out this switching driver.

    The simplest option might be something like this. You will need to read the data sheet to make sure it will do what you are after. You will need one hell of a heat sink if your running at full current. If it's a precision current source you need then that's a whole different thing. Much more to...
  5. Arouse1973

    Help figuring out this switching driver.

    Yep understood. Leave it with me. Adam
  6. Arouse1973

    Help figuring out this switching driver.

    No pin 3 is for frequency compensation of part of the circuit. The simplest option for current limit is a simple resistor. But do you want just plain current limit of current scalable constant current? Tell us what you are going to be doing with this and I might be able to suggest something. Adam
  7. Arouse1973

    Help figuring out this switching driver.

    Without additional circuitry you are only going to be able to adjust the frequency (Pin 6). The other two are set internally and it doesn't seen like there are any options to modify this from the IC pin out. Adam
  8. Arouse1973

    transformers back to back - why won't work?

    Yes I think your right Bob. This should be taken into account when the transformer is designed. Of course a real transformer falls from ideal which is total cancelation and it is said an Ideal transformer with an ideal core shouldn't draw any current in the primary off load. I think a real...
  9. Arouse1973

    transformers back to back - why won't work?

    Hi Hop That's an interesting question. As I understand it when a load is connected to the secondary of the transformer a current appears through the load. This creates it's own magnetic flux which circulates in the core but in opposition to the original flux from the primary. This tries to...
  10. Arouse1973

    transformers back to back - why won't work?

    Sorry I should have been clearer. The core will saturate if there is too high a magnetizing current. This is the current with no load. The load you put on the output doesn't have much of an effect on this because of the cancelation of magnetic fluxes. The cancelation should just leave the mutual...
  11. Arouse1973

    transformers back to back - why won't work?

    Hey Hop Without any magnetizing current the transformer wouldn't work. This is the current in the primary with no load connected. This is what sets up the initial magnetic flux in the core and is related to the integral of the applied voltage. This is the one that will cause core saturation if...
  12. Arouse1973

    Help with Gain

    Yes your right Kris. I am so used to working with definite levels in EMC I missed that one. Thanks Adam
  13. Arouse1973

    Help with Gain

    Yes I agree with Kris. If you only have voltages and nothing else then express this in dBV, using the formula as above #5. Adam
  14. Arouse1973

    transformers back to back - why won't work?

    I think it is mainly due to losses in the core material (Iron Loss) and conductors, both the reflected flux from the secondary and flux from the primary don't fully cancel out due to flux leakage. You also have to consider eddy currents and temperature increase which effect the permeability of...
  15. Arouse1973

    transformers back to back - why won't work?

    That's interesting, I thought saturation occurred when all the magnetic domains lined up due to excessive magnetic flux. This magnetic flux is related to the current and the turns of the transformers primary. But I guess current is linked to voltage anyway. Adam
  16. Arouse1973

    Help please - recording/playing device

    Hello Pavla. What you ask is achievable but it depends on how far you want to get stuck in. As you say you have no knowledge in electronics, I have tailored my response to you because of that. So some things that come to mind are a Dictaphone which could be used to drive a small set of powered...
  17. Arouse1973

    New & Willing to Learn!

    Yeah welcome. Adam
  18. Arouse1973

    Potentiometer characteristics

    Colin, please don't be so rude. The fact that someone cant spell should not be held against them. It really pisses me off when people are like this,because a lot of great people cant or couldnt spell either. Like these. Actually, Da vinci said "You should prefer a scientist without literary...
  19. Arouse1973

    help me to design simple buzzer

    Give it a go. Adam
  20. Arouse1973

    help me to design simple buzzer

    Your 10K resistor is too high to drive the buzzer in that configuration. Consider adding a transistor buffer to drive the buzzer. Adam
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