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  1. E

    alarm circuit using lm555

    what is a PUT?  ???
  2. E

    Microwave Transformer

    is clamper another word for thermal switch? never heard of it before.
  3. E

    transistor off

    :D even though it works perfectly in the sim i have to make something of my own creation, else i'm not learning so i'm going to try it now with a active current sink since i can use the gate voltage swing to my advantage. you've won this round *shakes fist* ;D
  4. E

    transistor off

    i'll try and figure out a way to lower the impendance. some heat wasted is ok, i only need 1 watt from each channel and the mosfet bias will come from the op-amp. question: to lower the impendance don't i have to raise the current or can it be done a simple circuit, i'm trying to keep a class...
  5. E

    transistor off

    is this output stage ok?
  6. E

    transistor off

    i am starting over  ;D btw that current source was working right then i pulled a resistor live and now i have two holes in my breadboard and two cracked fets  :-[  good thing i have more  :)
  7. E

    transistor off

    your right, i have it hooked up right on the board but wrong in the schematic, funny thing it works fine in the sim then when i put it right i got a jagged wave!!! so i got rid of the 317 and put a more flexable current regulator in, tell me what you think. still have to build this one but i...
  8. E

    transistor off

    here are the node voltages, i have a vom hooked up to the bottom of r8 and the voltage is hardly moving but something is giving me crazy bass from this regge song, sounds great! 6 ohm load, r1 is 4 ohms, have on a small lead acid battery. i had it as shown and worked great. clean sine waves to...
  9. E

    transistor off

    "Your OP37A opamp has a voltage gain of 19k/10k= 1.9 with a low impedance source, and a voltage gain of 19k/(4.7k + 10k)= 1.3 without an input. But the OP37A opamp is de-compensated and is unstable with a voltage gain of less than 5. It will oscillate." does it matter since i'm not using a...
  10. E

    transistor off

    i've made some changes again, the amp did oscillate but because the mosfet was actting as an anttena in the low Mhz. new mosfet, some changes. so far no problems from the op-amp, will look at the data sheet.
  11. E

    transistor off

    it's not really supposed to have voltage gain, it's a current amp  :) rev1.1: the op-amp is opa37
  12. E

    transistor off

    i'll be making some changes, keep the comments comming.  :D
  13. E

    transistor off

    direct link,
  14. E

    transistor off

    URL=http://imageshack.us] not bad considering i used whatever was laying around, tell me how i can improve it, spacificly how can i get the mosfet in the feedback loop?
  15. E

    The relationship of Amplifier vs Power vs Frequency

    it depends on the load.
  16. E

    lm317 as current regulator

    hooked it up wrong  :D
  17. E

    lm317 as current regulator

    on the data sheet it says you can make a current regulator by just putting a resistor on the adj and out pins 1.25/R = current out, why is it pulling 1.5A with a 100 ohm resistor?
  18. E

    LM338/LM318 Not enough power. Vref drops!

    maybe back emf is destroying your regulators?
  19. E

    transistor off

    thanks audioguru, i'll now proccede to made an amp.
  20. E

    transistor off

    "IRFZ44 has a minimum drain current of 31A if its gate voltage is 10V" so does it matter what the drain voltage is?
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