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  1. (*steve*)

    Photo sensor

    I think @Tony Gunk should start by explaining, as best he can, how he thinks the circuit operates. Even better if he can then come up with some limitations. And then we could discuss improvements to address those limitations (or maybe decide that those limitations are things we can live with...
  2. (*steve*)

    Electric skateboard

    That should be fine. Make sure those switches can handle the current, and preferably have them arranged so you can't turn both of them on at the same time. A changeover type switch would be better.
  3. (*steve*)

    Transient Voltage Spike

    The TVS diode has a defined behaviour in the breakdown region. It should not be in use as a rectifier, and replacing it with one would be a bad idea. It's a bit like replacing your steering wheel with the spare tire. They're both wheels, right?
  4. (*steve*)

    Is this something fixable?

    My guess is that the capacitor failed short circuit. Hopefully the damage is more cosmetic than it appears. I would remove the failed capacitor, and possibly the one next to it and clean up the board as much as you can. Isopropyl alcohol on a q-tip would be my first method. If there's...
  5. (*steve*)

    LED street lights

    It looks like a street light.
  6. (*steve*)

    MOSFET Circuit Help

    This problem sounds akin to someone complaining that the steering wheel on their car causes the car to change direction when driving, and then asking which steering wheel cover will prevent this from happening.
  7. (*steve*)

    Cleaning Soldering Iron Tips

    Yeah, there are several things that will improve your soldering that have nothing to do with skill. Good solder A good tip Everything else And I'm not really sure about the order of 1 and 2. :-) If the question involves cleaning other than removing excess solder and oxidised flux, I'd think...
  8. (*steve*)

    How to run BLDC motor from an old printer

    That appears to require 24V. The other connections may require other voltages (e.g. 5V) or may need to be grounded, or may require a signal (I don't know which). The motor itself appears to have just 3 wires. Those 8 wires connect to a controller that does all the hard work of driving the...
  9. (*steve*)

    First alert security camera power source

    That's pretty normal for an unregulated wall wart. And surely you know not to.
  10. (*steve*)

    LED schematic diagram

    You'll have to upload the image. What you've provided is invalid. When you reply to this, click on "more options" and you'll find the link to upload a file. Use this to upload your image.
  11. (*steve*)

    Please help me... FM Bug transmitter

    Then why did you ask?
  12. (*steve*)

    Please help me... FM Bug transmitter

    I imagine his thoughts were along the line that this appears no different to a multitude of electronic clock mechanisms.
  13. (*steve*)

    Clarification of terms S:N

    I have liked the above three replies because I am simply impressed that you guys found something in @tedstruk's word salad post which could be answered. On another point, I would consider hum to be noise, simply on the basis that it's not signal.
  14. (*steve*)

    555 pwm controller.

    Assuming that this transformer is what was supplied with the drill, then a simple PWM controller based on a 555 should be fine. When you say "nail drill", I'm assuming it is some sort of device used for cosmetic purposes by a "nail technician". I can quite easily see that something like this...
  15. (*steve*)

    Newbie here need help

    Sure. Connect the buzzer between where pins 2 and 3 are and remove all the stuff from between pin 1 and ground. The buzzer will get about 4.5 volts. If you want to increase that to closer to whatever the supply voltage is, remove D10 (you'll get the supply voltage less a few volts). There may...
  16. (*steve*)

    OP amp guidance for newbie

    Yeah, read the logic value on pin 7 before you display. If it's high, go ahead an display. Otherwise, blank the display.
  17. (*steve*)

    Beginning electronics, understanding whats actually happening

    My general advice for anyone reading H&H is to ignore chapter 1 on your first skim through it. Chapters 2 to n are interesting, informative, and maybe even inspiring. Chapter 1 is really dry and a great read if you can't sleep. However, you really need to understand what's in chapter 1, so...
  18. (*steve*)

    N channel Fet v npn

    The answer (for all of these devices) is "place the correct voltage on the control terminal." However, that voltage will vary between devices (even if the same type), change with temperature, and be vastly different between devices of different types. Typically, you either use the device as a...
  19. (*steve*)

    Solar to battery to tv, fan etc

    But it's so cold there that you can open the chest freezers to warm your house, right? :-D
  20. (*steve*)

    SPI ADC/DAC with 8051

    You are still taking a specific case and assuming it is general. The first sentence of your second paragraph is great. The second sentence generalizes enough to be wrong. The third sentence is a truism, but at least it's not wrong .the next sentence is wrong (and doesn't have a full stop)...
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