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  1. E

    transistor off

    i'll answer one, Vt is the voltage threshold, should be 0 to start off with but if you reverse bias the gate current flows backwards through it  :o
  2. E

    transistor off

    using split supplys if i keep the gate at 4 volts above drain it saturates, when gate equals 0~4 volts above drain it stays in linear mode (corresponds to Vgs for irfz44, which is what i'm testing). Id=2k[{(Vgs-Vt)Vds-Vds^2}/2] is how you calculate drain current in linear mode but here's my...
  3. E

    transistor off

    gate V to I is almost 1:1, so what is G used for?
  4. E

    transistor off

    ok i have 3 points gate voltage  current gain  Vd 4.6                  2ma              1.8 5.2                  13ma            2.2 5.6                  25ma            2.45
  5. E

    transistor off

    ok, i think i understand mosfets when they are in saturation mode but i'm having trouble figuring how to calculate gate voltage (Vgs) to drain current (Id) using G(transconductance ratio). in the schematic i just left generic values, i have a led in the place of r2 and i'm making a plot, but for...
  6. E

    transistor off

    will post a schematic in a day.
  7. E

    thyrsistors

    where can i get info on these?
  8. E

    I like to find someone to build prototypes

    :D
  9. E

    transistor off

    anything go's, i have two irf530's waiting to be used but i don't want to go it alone  :D
  10. E

    Electronic lab kits for learning?

    i'd get the 150in1 kit first, make sure you buy it new.
  11. E

    transistor off

    anyone want to build a one transistor amp for headphones? i mostly to compare notes. rules would be you can do anything but you can have only 1 active device (either a mosfet or bjt), no op-amps allowed. i'd like everone to agree on one type of transistor (something generic) but thier probably...
  12. E

    Class A amplifier Formulae help!!!

    40%, i don't what your doing i can get under 1% without even trying, i've seen 1 transisitor amps that got .01 thd.
  13. E

    Class A amplifier Formulae help!!!

    but the distortion will be mostly 2nd order so it will still sound good  ;D
  14. E

    A very Urgent Question

    he wants to change how long the led stay so you need to calculate the rc time constant, put a on capacitor on vo+ to ground, it will determine how long the transistor stays on for, also when the .47uf cap is down to .6v it's going to cause intermittent operation (a series of rapid clicks at the...
  15. E

    A very Urgent Question

    sorry i should have said that differently, keep the ir diodes on without the 555, measure vo on the detector and make sure that you have the detector in a black tube away from outside light and you'll find the problem. you need a 2200uf cap in front of that regulator if your going to use a relay...
  16. E

    A very Urgent Question

    that circuit needs some work, i'd trash it and start from scratch.
  17. E

    Class A amplifier Formulae help!!!

    what transistor are you using?
  18. E

    Finding Transistor State

    forward active mode? active mode = amp type circuit, between the cutoff and saturation mode. forward = the voltage flow in the base emitter junction.
  19. E

    Finding Transistor State

    what is forward act?
  20. E

    British Standards?

    buy a comparable device and read the tags.
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