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  1. autir

    i have a question

    Thanks.  :D
  2. autir

    Volt regulator & Battery

    Steveggz, what will be the maximum current flowing through the regulator?
  3. autir

    i have a question

    Anybody cares to explain how does the "150V input protection" part work? I am thinking of building a similar circuit for my computer. I don't care about output amplification and adjustment, I just want to increase the input impedance and protect my computer's soundcard from burning.
  4. autir

    Time division duplex led

    Hello all
  5. autir

    Choice of op.amp. model

    And the third...
  6. autir

    Choice of op.amp. model

    Just downloaded the TL071, TL072 and TL074 datasheets from ST. In TL071's datasheet the pinout diagram shows the existence of the two offset null pins. There is also the scematic displaying the proper calibration. In TL074 there are no such pins. In TL072's datasheet the output from the second...
  7. autir

    Choice of op.amp. model

    Can you propose a power amplifier IC family? (1- and 2- input). Also, can you please explain how can we calculate the value of the voltage-dividing resistors in your sketch? And why all these capacitors between V+, V- and GND?
  8. autir

    how to recharge ALKALINE batteries

    No. I've come across some circuits which claim to recharge alcaline batteries to a very small degree and for a very limited amount of times. But we don't want acid splashed all over our face, do we?  ;D Just take the batteries to a battery recycling bin and dump them.
  9. autir

    Choice of small signal BJTs

    They cost 0.05 Euros each down here. Want me to send you a hundred or two?  ;D
  10. autir

    Choice of op.amp. model

    Hello
  11. autir

    Choice of small signal BJTs

    For the second time you shock me completely. What about all these people who scorn at op.amps and ICs and design these very expensive class-A amps claiming to be Hi-Fi?
  12. autir

    Impedance matching

    Dear audioguru The fact that English is not my native language gives me the right to ask for clarifications regarding your previous answer  ;D What I understand is that I should go for as much high input impedance and as much low output impedance as I can? Like in the ideal...
  13. autir

    Choice of small signal BJTs

    I found the section describing the transistor curves in my theory book. Yes they are fake. Without any doubt.  >:( What I understand from your reply is that it is impossible to replicate with 100% accuracy the input signal? Even with class A?!?
  14. autir

    Choice of small signal BJTs

    Hold on a second people! As we know, the flock of characteristic curves in the Vce - Ic level signify the relation between the incoming (Ib) and the outgoing (Ic) signal. In order for the output signal to be an exact replica of the input (though amplified), the curves must be as parallel as...
  15. autir

    Impedance matching

    I am trying to design a class-A audio preamplifier. The very classic design we all know, with 1 transistor, 4 resistors and 3 capacitors. Should the ideal input impedance be of equal value to the output impedance of the previous stage (e.g. electret microphone)? Should the ideal output impedance...
  16. autir

    Choice of switching regulator IC

    Yes, that's what I want  :D Have you got any tutorials/ docs in mind? What should I read to know how to start?
  17. autir

    Need e-shop located in EU

    Thanks!  :D
  18. autir

    Choice of small signal BJTs

    Exactly what I used to do. But if I design a circuit and put it on the Internet, I cannot recommend a possibly cheapo, hard to find transistor type. So, audioguru, I take it as you recommend me to stick just with the BC546-550 family?
  19. autir

    Choice of switching regulator IC

    If you take a look at the datasheet, the adjustable output voltage version is what I have in mind. There is no ferrite core transformer in this circuit (or in any other circuits in this datasheet, if I'm not mistaken). Another problem: How could I provide the unregulated DC input voltage...
  20. autir

    Op.Amp. vs. Diff.Amp.

    So, as a rule, I buy Op.Amp ICs? And I decide whether I will use these ICs as Op.Amps or create with them a diff.amp. circuit?
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