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  1. Alec_t

    How Do I regulate 3v DC?

    You could try either.
  2. Alec_t

    Gate driver datasheet for IGBT

    No. If your input voltage is 220V RMS, that has a peak voltage of 311V. Your cap should be an X2 type rated for at least 350V.
  3. Alec_t

    Guitar Electronics .

    Attachment link is broken.
  4. Alec_t

    Attaching a terminal to battery

    Looks like the dead battery +ve tag was spot-welded onto the battery originally. You should be able to buy a replacement battery with tags already on. That said, I recently had to replace a similar battery and rather than send off for a tagged one I cobbled together a holder from a bit of...
  5. Alec_t

    Guitar Electronics .

    Use better quality tone and volume control components ;). What do you mean by 'enhance sound' exactly? What have you already got, which you think needs enhancing? Yes. If you want detailed answers you must provide more information as to the kit you already have and in what way it is deficient...
  6. Alec_t

    Attaching a terminal to battery

    Welcome to EP! Some sharply-focussed cloe-up pics would help.
  7. Alec_t

    More Range From 10 turn POT

    It's not ideal, but you could try getting better adjustment by connecting a ~1k5 resistor between pins 1 and 2.
  8. Alec_t

    Neon glow bulb (ne-2) arcs/flashes when powered

    Agree with steve. That 'k' is very important ;).
  9. Alec_t

    How Do I regulate 3v DC?

    The problem with a 470uF from an old VCR is that the 470uF will be old, too. Old electrolytic caps are likely to have deteriorated, so may not work well. But give it a try anyway ;).
  10. Alec_t

    How Do I regulate 3v DC?

    If we assume the 'equaliser' has some electronics which are sensitive to supply voltage ripple then a smoothing capacitor external to the AC/DC adapter may well help. You could try, say, 470uF (rated for >20V in case the supply gets inadvertently switched to its maximum voltage setting).
  11. Alec_t

    Help to reduce this schematic price (beginner)

    Those inductors would handle only tiny currents; not the big currents you would need for driving speaker loads of 8 or 16 Ohms.
  12. Alec_t

    Transducer AC mv/V to 0-5 VDC Conversion........... I think?

    Without the manufacturer's conditioner, how would you calibrate the torque sensor? The '1mV/V' spec seems meaningless to me in the absence of data showing the relationship between that figure and torque.
  13. Alec_t

    Capacitor / filtering for PSU

    Doesn't the datasheet show how they're used?
  14. Alec_t

    Kinetic Phone Charger

    If your generator is a series of piezoelectric discs then they have such a high impedance that you will get very little current out of them. Their output voltage gets attenuated dramatically by a low-impedance load. Their average output power is miniscule.
  15. Alec_t

    how pir sensor works?

    Depending on the spectral response of the PIR sensor you will probably need an IR LED, not a visible-light one, to test it.
  16. Alec_t

    pir..110v or 12v?

    After the heater has been off for a time when the room is unoccupied, how long does it take to bring the room up to a comfortable temperature, bearing in mind that the heater is only 1500W? If the time is excessive, then power reduction, rather than switching off the heater completely, might be...
  17. Alec_t

    EEG circuit - need help please!

    From what I read, EEG signals are ~100uV in amplitude, so with a gain of 89 you should ideally expect only ~9mV output from the 620.
  18. Alec_t

    remote controlled toy receiver ckt problem

    Welcome to EP! Without a schematic of your system it will be nearly impossible to give you a solution.
  19. Alec_t

    1.2w/10mA LEDs

    Nice. And does it meet with wifely approval?
  20. Alec_t

    EEG circuit - need help please!

    What frequencies are you hoping to detect? A PC sound card typically has a frequency response which drops off sharply below ~25Hz.
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