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  1. Arouse1973

    Voltage to current converter circuit

    Right, sorry for the delay. I have been busy the last few days. I have an Initial simple solution which I have attached, Input is 100 mV sine @ 5 KHz but should work at 20 KHz . R3 is your current adjust resistor. It has only been tried with a resistive load and works reasonably well. The main...
  2. Arouse1973

    "Has it got the Cobalt?" (story)

    Yeah Funny :)
  3. Arouse1973

    Another woofer re-wire

    It shouldn't hurt the driver ICs with out any load but if your worried you could just cut the cone out of the two satellite speakers so your just left with just the coils. That is if you don't want them anymore. I don't know about modifying the circuitry to increase the sound output, it might be...
  4. Arouse1973

    Voltage to current converter circuit

    Ok let me see if I can sort something out. Adam
  5. Arouse1973

    Voltage to current converter circuit

    Ok I am still in the dark about what you actually want the circuit to do. Can you explain again so I get it. You know you can't have a selectable constant current that varies between certain values without changing at least one other thing. If you want to cancel out the reactance of the coil you...
  6. Arouse1973

    Voltage to current converter circuit

    I have re-drawn you circuit to make it a bit clearer, hope you don't mind. Adam
  7. Arouse1973

    Fixed! PS3 disc

    Well cool, thanks for that. Adam
  8. Arouse1973

    Voltage to current converter circuit

    Hi Bob I did some calculations and got different results to you. Where have I gone wrong? Cheers Adam
  9. Arouse1973

    Another woofer re-wire

    Is it not an active sub? If you just disconect the two other speakers won't it work? Or is it you need it louder and are planning on just using the speaker. Cheers Adam
  10. Arouse1973

    Common mode noise ??

    Common mode noise is one of the most common forms of EMI. Most people dont actually understand it and it can be very tricky to get rid off. I once asked one of my friends Keith Armstrong one of the world leading experts in EMC what all this common mode noise was about. He told me it took him 10...
  11. Arouse1973

    Chicken Coop Door Opener

    I am going to tell you a funny story regarding fuse selection. This is real I was there. I was sat in a lecture on power electronics many years ago and two lads at the back of the class were larking about. One of them put a banana plug lead in the mains socket. The other one turned it...
  12. Arouse1973

    Chicken Coop Door Opener

    Absolutely perfect Kris.
  13. Arouse1973

    Chicken Coop Door Opener

    I think that's a very good idea Dan. I guess the fuse your on about is to protect your circuit and transformers secondary? You will have a fuse in the mains plug to protect the transformers primary? I don't know what you have in your plugs over there. To protect the transformers secondary your...
  14. Arouse1973

    Chicken Coop Door Opener

    Dan now I am worried, you have um um gone over to the dark side. Mechanical drawing packages. whats all that about? :) Adam
  15. Arouse1973

    Voltage to current converter circuit

    I doubt very much your wrong Bob. :) Adam
  16. Arouse1973

    Voltage to current converter circuit

    Good point Bob. But what will the amp see in this case, 3R or 20R? At 20KHz. The load might not develop 20W but the amp can only supply 20W. Adam
  17. Arouse1973

    Chicken Coop Door Opener

    Kris is the code master, lost me about 3 lines in :eek:. Glad I love transistors. :)
  18. Arouse1973

    Voltage to current converter circuit

    I must be missing something here then? Maybe he can draw a schematic to show what he means. Adam
  19. Arouse1973

    Voltage to current converter circuit

    What about an audio power amp like the TDA2004. It will be running at max though, 20W = 17R+3R =20R at 1 A. Thanks Adam
  20. Arouse1973

    Voltage to current converter circuit

    I don't know of a way to change the current in an inductor if the frequency is fixed and the voltage and the inductor. You will have to change one of them. I guessing the voltage or frequency would be the best option? I might be missing something here sorry. Adam
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