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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by ormo

  1. O

    Power Supply?

    I'm looking for a power supply to run my latest gadget (laser display with green laser and 3 rotating slanted mirrors). At the moment it uses a rechargeable battery pack "borrowed" from an old R/C car but this doesn't last very long at all. It's ok for showing it off but for longer use (ie. at...
  2. O

    Choosing the right transistor?

    I'm still rather confused by all of this, does this look suitable? **broken link removed**
  3. O

    Choosing the right transistor?

    Sorry, 5.5V, my bad
  4. O

    Choosing the right transistor?

    Down to the design of the rest of the project the 555 will be running on 3.3V - will the BD243c still work well here? The PWM frequency is about 145Hz
  5. O

    Choosing the right transistor?

    I am having trouble finding the right transistors to drive motors. I have 3 identical PWM circuits based on the 555 timer. Each one will drive one of these motors: **broken link removed** My problem is finding the right transistor to drive the motors. If it helps, the weight on the...
  6. O

    9.6V Battery to 3V Supply

    If I were to use a LM2576T-3.3 it should work well, yes?
  7. O

    9.6V Battery to 3V Supply

    Thanks for the advice... would a LM2576 be suitable for this application?
  8. O

    9.6V Battery to 3V Supply

    I have a 9.6V rechargeable battery pack. I need to use it to power a thingymabob I'm making that runs on 3V. I was hoping to be able to do something like this: Somehow halve the voltage down to about 4.8V and double the current the battery is kicking out. Then use a regulator to bring it down...
  9. O

    Flashing a lot of LED's.

    A NE555 timer with the output connected to an appropriate transistor should do the trick. You can tune the 555 times to just about any duty cycle you want.
  10. O

    super computer

    totally off topic but thats a great film :)
  11. O

    Audio tone control circuit

    Ok I've got no idea why but it's suddenly started working... maybe some leads were touching or something. Thanks anyway!
  12. O

    Audio tone control circuit

    Power to the TL074 is +/- 15V at about 230mA
  13. O

    Audio tone control circuit

    Hi, I am constructing the tone control circuit that is attached. Ignore the +/- 28V lines, they feed the amplifier this runs into. The 50K balance pot runs to the same point on an identical circuit below for the right channel. I am constructing it on a breadboard at the moment, and I've got...
  14. O

    Problems with dual supply rectifier

    The voltage regulators aren't connected yet, but I've used them from the same transformer before and it all worked so I guess they're suitable
  15. O

    Problems with dual supply rectifier

    I have replaced all 4 capacitors but now only have one each side. The one between 0 and +15 is working fine and the output is about 16-17V. The one between 0 and -15 is still heating up and the output is about 8-9V. I don't understand where the problem could be.
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