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  1. C

    0402 vs 0201

    There as so few components in the project that is not worth messing around with.
  2. C

    0402 vs 0201

    This first thing you do is feel each resistor to see if it is getting hot.
  3. C

    can I use this wire?

    400mA is far to small for a motor. It will fail prematurely.
  4. C

    DC Voltage multipliers?

    He is too young to be handling a voltage multiplier. ;)
  5. C

    Through-hole & SMD components.

    A lot of things like a BD679 are much better in through-hole format because they dissipate a lot of heat and it is much easier to put them on a heatsink. 1N4004 diodes are readily available in SM. Look on eBay and you can get 100 posted for $1.00 The same with all other SM components. They are...
  6. C

    240vac capacitor type?

    Are you aware the 2u2 will absorb something like 100mA @200v and do nothing for the quality of the output. It is just a worthless circuit that has never been tested.
  7. C

    Why does the current always remain the same in a series circuit?

    If you argue about CURRENT IN A NUMBER OF COMPONENTS IN SERIES, then you don't understand the basics of electric circuits. The current is the same in each component.
  8. C

    pass transistor...

    Maybe you are talking about an emitter-follower situation.
  9. C

    pass transistor...

    Only 3 components are involved in the explanation, the transistor, the base resistor and the rectangle containing the voltage regulator IC. The 3 emitter resistors are only needed to make sure each power transistor delivers the same current. It is called CURRENT SHARING . The IN voltage is about...
  10. C

    Shower-Busy Musical Alert Buzzer

    Just use a $15.00 wireless doorbell and a diode thermometer to keep the transmitter sending a signal every 20 seconds.
  11. C

    The virtues of under-driving leds

    25% of rated current is a bit too low.
  12. C

    Making a beacon

    At the same time the school can request the student make a new Sinclair computer the size of a matchbox and costing less than $30.00
  13. C

    Pot Core dismantling

    Try a fine blade to cut into the glue
  14. C

    question about ALPS potentiometer.

    Just get RP7 or CRC and with a long screwed shaft, spray into the pot via the shaft.
  15. C

    Electric motor - one rotation then stop

    Put your switch across the micro switch
  16. C

    Astable 555 Circuit Problem

    Does you beeper beep when connected to a battery?
  17. C

    Electric motor - one rotation then stop

    Simply use a cam and micro switch. The cam is long enough to allow for the over-run. That's all you need.
  18. C

    DIODE

    Many uses for a diode are covered HERE Diode - How A Diode Works
  19. C

    chinese car voltmeter calibration

    "What I said is still correct, " I don't think you are correct because if the circuit is as shown, the regulator will drop out of regulation when the supply is 5v. I think the chip has an internal reference.
  20. C

    chinese car voltmeter calibration

    "I might have this exactly the wrong way around -- I've not been up for long." Yes, you have it around the wrong way. The adjustment is the 1% resistors. Put 10k to 100k across either resistor and see what happens.
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