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  1. Hero999

    Low power solenoid?

    An electric motor with gears will do the job. Another possibility is a piezoelectric linear actuator.
  2. Hero999

    0-30V Stabilized Power Supply

    Try converting it to monochrome (1-bit per pixel).  Not only is it more clear but the file size has shrunk too.
  3. Hero999

    Success!

    Good! There are many excellent analogue oscilloscopes still around. They're something that should be treasured. Most models are no longer in production and sometime in the future will be difficult to get hold o of. Do you have any other oscilloscopes?
  4. Hero999

    electronics ebook

    Apart from the fact it contained copyrighted material so has been deleted.
  5. Hero999

    School Project : Weighted Timing Controller

    If you don't have access to shift registers or adders, then you'll have to make them, from the other ICs. Of course, the easy way is to use a microcontroller but you're probably not allowed to do that.
  6. Hero999

    how measure fuel level in bike as digitally

    http://www.electro-tech-online.com/threads/lm3914-calculator-and-build-questions-from-an-electronics-newb.107121/ http://www.kawasakimotorcycle.org/forum/mechanics-corner/113080-can-i-add-fuel-gauge-bike-doesnt-have-one.html http://www.electro-tech-online.com/threads/electronic-fuel-gauge.93732/...
  7. Hero999

    parallel bridge rectifiers

    It should help to improve current sharing, since the diodes connected in parallel are in the same module. Copper is a good conductor of heat, better than aluminium. The only reason why it's not used very often is because it's more expensive and heavier than aluminium.
  8. Hero999

    Looking to fix very old AC/DC sewing maching motor - for art project

    If you cut the cord and connected a standard mains connector, it would probably work. It wouldn't be safe, since the metal case wouldn't be earthed. The correct way of doing it is to use a three pin plug, witht he eartht conductor connected to the motor's case.
  9. Hero999

    Looking to buy pre etched pcb

    Check ebay. You can buy a TDA7297 amplifier moduel (all the parts and board, fully assembled) for less than that! http://www.ebay.com/itm/DC-6-to-18V-TDA7297-Power-Amplifier-Module-2-X-15W-Double-Channel-10-50W-/310735726006?pt=LH_DefaultDomain_0&hash=item48594ae5b6...
  10. Hero999

    Remote control using MRF49XA and pic16F628A

    I have not used the MRF49XA before. How did you build the prototype? According to the datasheet, board layout is critical, as with any circuit running at UHF.
  11. Hero999

    DC Timer

    More information is needed. The ICM7555 can probably do this but a potentiometer will be needed to adjust the delay. A microcontroller can be used to build a more flexible timing device but will need a voltage regulator (5V or 3.3V) and an output buffer to interface with the 18V devices.
  12. Hero999

    IC doesn't fit in pcb

    The potentiometer shouldn't be connected to the main power input. The volume control is nearly always connected to the signal input. A potentiometer varies the amplitude of the signal going in by acting as a variable potential divider. Since your circuit has two inputs, you need to have a dual...
  13. Hero999

    IC doesn't fit in pcb

    I thought he was using strip board but there's no way of knowing for sure without a photograph. As far as the potentiometer is concerned: you may have to solder wires to it but keep them short and they may have to be screened, if it's carrying a small signal.
  14. Hero999

    LM384N/NOPB-IC amplifier with heatsink

    That sounds about right. For bridged stereo there's the TDA7297. http://docs-europe.electrocomponents.com/webdocs/0a33/0900766b80a339df.pdf
  15. Hero999

    LM384N/NOPB-IC amplifier with heatsink

    You'll never be able to drive those speakers from with a power supply voltage of 20V is 25W but in reality the usable power will be half that so don't worry about blowing those speakers. How many channels do you need? If it's just mono, then I'd recommend the TDA2009 bridged, if it's stereo...
  16. Hero999

    0-30V Stabilized Power Supply

    A transformer with a dual 28V secondary winding will do. D11 will protect the output in case of reverse polarity. Another diode can be placed with the anode on +Vout and the cathode to the positive of the bridge rectifier to protect against brief positive high voltage spikes entering +V. You...
  17. Hero999

    Voltage Level Switch

    A comparator & voltage reference IC will do this. See links below for datasheets: http://ww1.microchip.com/downloads/en/DeviceDoc/22269B.pdf http://www.micrel.com/_PDF/mic841.pdf
  18. Hero999

    1-25 volt power supply

    It isn't the same. In my circuit, the output transistor is inside the negative feedback loop of the operational amplifier. In your circuit, there's negative feedback before the output transistor. In a power supply circuit, the power element (i.e. output transistor) should always be inside the...
  19. Hero999

    AC/AC power supply

    What's the output voltage of the AC/DC converter? What sort of PSU is it? Switched mode, low frequency transformer? If it's a switched mode power supply, it should be able to work from DC as well as AC and 277VAC has a peak voltage of 390V so it should be able to work off 390VDC. It really...
  20. Hero999

    0-30V Stabilized Power Supply

    Can you please save it and attach the file in plain text or PDF format, as the forum software doesn't allow Word documents.
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