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  1. Hero999

    How to rebuild a Li-Ion battery pack

    Using a higher Ah cell shouldn't cause a problem as long as the fuel gauge can be properly recalibrated. I think the whole article is a bad idea though. I doubt you'll save any money rebuilding a battery pack. If you're drawn to cheap cells available on ebay then think again; they're probably...
  2. Hero999

    0-30V Stabilized Power Supply

    Then use 15000uF or 10000uF with 2200uF in parallel.
  3. Hero999

    InNovation ProjeCt IdeAs

    You might  get more help if you post in English and not posting the same thing more than once. The latter is against the rules. Making duplicate posts is treating as spamming and repeat offences will result in a ban.
  4. Hero999

    What are the best small appliances for my future kitchen?

    How much cooking do you do? A microwave and toaster are all you need most of the time. Just make sure you get a decent brand not no-name Chinese trash.
  5. Hero999

    0-30V Stabilized Power Supply

    I don't see why it wouldn't work. The ILC7660 would need a voltage regulator to reduce the supply voltage to below 10V. Look at the datasheet of the ILC7660 for its maximum output current rating. Calculate the negative supply current taken by U3 when the output voltage is 0V. If it's above...
  6. Hero999

    High Voltage Buck Converter Challenge 100-28V Step-down

    What's the output current? Have you considered an off the shelf solution? A power supply designed to run of universal mains input will probably do. The Puls ML50.100 (datasheet linked below) may suit you; it will work from 85VDC all the way up to 375VDC, the output voltage can be adjusted to...
  7. Hero999

    THE LINK TELEPHONE CAPICATORS

    My guess is they're something like 100nF  but I can't be sure. This project is typical for this website: incomplete and may not even work. The use of opto-couplers where no isolation is required is bizarre and the circuit appears to be drawn an an almost deliberately confusing manner.
  8. Hero999

    Turn on lights and motor for different timed cycles.

    I think a programmable IC is a good idea, PIC and AVR microcontrollers and programming hardware can be bought fairly cheaply nowadays. Why not go for LEDs rather than a cold cathode tube? They're no nast high voltages to worry about and no mercury or glass.
  9. Hero999

    Design Help Needed

    How long to you want it to last for? You don't have large enough batteries to light that many LEDs for more than a couple of minutes at best.
  10. Hero999

    Design Help Needed

    Seams fairly simple to me. Connect the LEDs in strings of as many as the power supply voltage will allow, each with its own series resistor and use a power MOSFET to switch each bank of LEDs.
  11. Hero999

    Transformer coupled transistor amplifier

    Here's a simple push-pull transistor amplifier. It has a power output of just 250mW. With a few modifications and a higher voltage power supply, the power can be increased to 5W with a much lower quiescent current and lower distortion than a class A amplifier with a transformer...
  12. Hero999

    DIY problems--Capacitor Voltages

    It's always better to use a capacitor with a higher voltage rating than the intended power supply voltage. 16V is the minimum voltage rating for a capacitor connected to a 12V system.
  13. Hero999

    DC Power Supply (5V 10A) - Questions

    A DC motor doesn't need a regulated power supply. Buy a 6V transformer with the desired current rating, connect it to a bridge rectifier and run the motor from that. If you need a smooth DC power supply to run a microcontroller you can use a voltage doubler circuit and the LM7805 to dereive a...
  14. Hero999

    From Battery Operated to Electrical Point Operated

    Buy a 5V mains adaptor such as the sort used to power a mobile phone, cut off the plug and solder the wires to the battery terminals.
  15. Hero999

    Project (Simple Stereo Audio Amplifier)

    The answer is to use an audio amplifier IC such as the LM386, TDA2822,  TDA7052, TDA7053 etc. The schematic is on the datasheet which can be found using a search engine.
  16. Hero999

    DIY problems--Capacitor Voltages

    The voltage marked on the capacitor is its maximum voltage rating. Using a capacitor with a higher working voltage than is necessary is good practise because the component will be under less stress.
  17. Hero999

    Buying a soldering station

    Why would you waste money on 200W? Read the specification.
  18. Hero999

    Buying a soldering station

    Yes, as long as the transformer is rated to 70VA or more.
  19. Hero999

    1.2-15V 3A Adjustable regulated power supply

    The propper way to do this is to use a centre tapped transformer and draw the power from the centre tap when the output voltage is set below 6V.
  20. Hero999

    90VDC Motor Controller

    It's a dangerous design. The DC side should be isolated from the AC. The easiest solution in this case is probably to use an optically or pulse transformer isolated TRIAC to perform phase control on the AC side of the rectifier.
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