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  1. (*steve*)

    5v Voltage Regulator Help

    Also the 1A fuse, as shown, will blow when you draw in excess of about 700 mA. A 2A fuse (and by extension a 2A transformer) would give a maximum DC current of about 1.4A. For use as a USB charger, I would get a switch mode DC-DC buck converter module from eBay. Get one rated for 3 to 5 A...
  2. (*steve*)

    Accurate temperature control for water heater.

    The answer is a sous vide machine. There are various immersion type sous vide heaters that include circulating pumps. These devices typically have PID controllers and accuracy to a fraction of a degree. One of my colleagues used his sous vide cooker for tempering chocolate quite frequently...
  3. (*steve*)

    LED for electric heater (UK)

    I would be surprised as well. My guess is that what you saw wasn't what you thought you saw.
  4. (*steve*)

    LED for electric heater (UK)

    I would get a neon indicator with the appropriate series resistor wired to come on when the power is turned on.
  5. (*steve*)

    Super capacitor phone battery

    There are 4 basic problems to overcome: First is the voltage (and the way it drops steadily during discharge) A boost converter, as stated earlier in this thread is a simple and effective solution. The second problem is more tricky. Most supercaps have a very low maximum voltage (2.5V...
  6. (*steve*)

    Current sensing circuit help

    Edd, R4 looked like 1.44M to me with my bleary eyes.
  7. (*steve*)

    Current sensing circuit help

    There are a number of problems, but some of them won't affect you until you have an input. The problems you'll face without an input include: The gain of 400 is quite high for a single stage. This will amplify problems with offsets and reduce the frequency response. The input offset of 2 to 3...
  8. (*steve*)

    Opamp to pic a/d

    Depending on what you want to so, you might want to amplify the signal and then feed it into a peak and hold circuit. This then gives you a DC voltage to read which corresponds to the peak voltage on one half of the waveform.
  9. (*steve*)

    Dial cord slipping

    I keep taking this thing apart to try to fix it, and then have to put it back together to take it to the post office to chase up the insurance claim... I have put the pot back together, but it is too far gone. I found only a single replacement. They also have some collet knobs that don't...
  10. (*steve*)

    Electronics for prop control

    I have some experience with this... When I was being shown around a former workplace by Hop he was collared to explain some of the details of the operation of the linear accelerator there. I'm sure there's a lot in Hop's head that people want to decant. :) Keep healthy! My vote is for you...
  11. (*steve*)

    Capacitance of capacitors

    Yeah, when looking at it I considered that all the capacitors could be replaced with reactances an solved as if it were a network of resistors. After reading Laplace's reply it seems that is what he suggested (in a far more detailed manner)
  12. (*steve*)

    Interesting PCB production method

    After painting on the solder paste, I'm a little surprised the board wasn't just stuck in an oven (or even on a skillet) :-)
  13. (*steve*)

    It's my 1 year Electronics Point anniversary!

    Happy anniversary. :-D
  14. (*steve*)

    Power supply series connection

    Diodes rated at moire than 30V and more than 5A would be best. Even some 1N5408's would probably be fine. They will be called on very rarely (if at all) and their short-circuit failure mode will probably protect the power supply (as long as it is protected against short circuit) if s large...
  15. (*steve*)

    DC step down

    No (typically). Many buck converters have one output (ground) in common with the input. If you can find one with totally isolated outputs then you may be able to do this. But the problem is the input voltage. Or use something like this.
  16. (*steve*)

    DC step down

    Find a buck DC-DC converter with an input range which includes 48V, an output range which includes 32V, and a current capacity greater than 5A.
  17. (*steve*)

    Debris under base of Sony Projection TV

    Assuming the leafy bits are dry, I doubt it will do any damage. They shouldn't stop you testing the TV. The electronics is mostly away from the screen in rear projection TV's that I've seen.
  18. (*steve*)

    What's this called (knob attachment)

    That would be lovely. Who are you people? Do I know you?
  19. (*steve*)

    Power supply series connection

    If you connect two power supplies in series, then short the output, it is like connecting two power supplies together positive to negative and negative to positive. This is worse than simply shorting the power supplies. In this case, rather than the positive rail being forced to ground, it is...
  20. (*steve*)

    Dial cord slipping

    That's the one with the dial cord attached. It controls the main dial.
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