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  1. Hero999

    Random Q's: Audio Overlay,

    Does the radio have an AUX input? If so connect it to that, you can safely connect the left and right channels together. As audioguru said connecting outputs together is a recipe for disaster.
  2. Hero999

    question on power supply

    Take it you mean 30kWh per day? That's an average of 1.25kW. Firstly you need to cut down on the electricity usage as much as possible. Have you done the following? Replaced all heating appliances with gas. Installed smart master/slave sockets to cut down the number of devices on standby...
  3. Hero999

    Bubble memory cartridge for Sony/Tektronix Model 370 Curve Tracer

    Bubble memory? Does that thing use valves (tubes)?
  4. Hero999

    0-30V Stabilized Power Supply

    It is possible to do that but we can't do it, only the administrator can.
  5. Hero999

    analog ammeter

    Here's a cheaper meter. It's probably not very accurate so will need calibrating. http://www.maplin.co.uk/Module.aspx?ModuleNo=5635
  6. Hero999

    thermo electronics

    It's actually pretty simple. He already knows the heat input. All he needs to do is calculate the power output which is as simple as connecting a resistor, measuring the voltage and current, and applying Ohm's law. Then he'll have the power in and power out, enabling him to calculate the...
  7. Hero999

    220 to 110 V convertor advice

    The normal way to do this is to use a transformer but you might be able to use a cheaper and more compact method depending on what you're doing. I agree with the others: your diagram doesn't make much sense and needs more detail.
  8. Hero999

    analog ammeter

    It's not cheap though, you could buy a decent DVM for less than that. A 1Ω resistor would also dissipate 100W at the full range of 10A. You're better off using a 50
  9. Hero999

    analog ammeter

    Look it up on Wikipedia: http://en.wikipedia.org/wiki/Ameter This is more of a mechanical project than electrical. Care to mention the current range? You might need a shunt resistor in parallel with the coil but that's about it.
  10. Hero999

    final year project: a blind stick that uses different sensors, help needed

    That's right, you got there in the end.
  11. Hero999

    final year project: a blind stick that uses different sensors, help needed

    That's pretty far out. What value did you calculate? Look at the datasheet for a comparator IC such as the LM393, do you really think it can directly control a motor? Yes.
  12. Hero999

    IR Thermometer

    We've already told you, perhaps Mr Caps Lock will make it more clear: NO IT IS NOT POSSIBLE TO USE AN INFRA-RED RECEIVER AS A TEMPERATURE SENSOR.
  13. Hero999

    IR Transmitter/Receiver

    Stupid question, how can it measure temperature, it's a microphone? Don't be silly, it measures sound not temperature.
  14. Hero999

    final year project: a blind stick that uses different sensors, help needed

    The calculation for R2 doesn't look right to me, the correct calculation can be found in the Wikipedia article I linked above. With R1 = 10k and R2 = 4k7 the trigger voltage will be 1.6V. As for RV and RL: I don't think you've given this enough thought, you're not supposed to copy the...
  15. Hero999

    IR Thermometer

    It depends on what you're trying to do. It's pretty easy to just trigger a comparator when a sensor is exposed to heat or cold. Here's an example, Th1 is in a parabolic reflector such as that used by a torch (flashlight in the US), Th2 acts as a compensator, the comparator activates the LED...
  16. Hero999

    final year project: a blind stick that uses different sensors, help needed

    What have you been doing for the last month? When is the deadline? Here's a comparator tutorial. http://home.cogeco.ca/~rpaisley4/Comparators.html Here's a couple of sites to help you with the potential divider. http://en.wikipedia.org/wiki/Voltage_divider...
  17. Hero999

    IR Transmitter/Receiver

    Why not use FM radio? You can buy little FM mic' transmitters which have a greater range than IR would.
  18. Hero999

    Brightest LEDs on the planet?

    Colour temperature is the equivalent to the light emitted by a black body at that temperature. The filament of a typical incandescent bulb is around about 2700K, a halogen filament is hotter about 3000K. It's a matter of opinion, I hate daylight bulbs, they don't emit daylight but a horrible...
  19. Hero999

    A computer power supply unit component missing

    Sorry but if you need to ask such a question then you probably shouldn't be repairing it. Please don't be offended I would feel bad about myself if you got electrocuted and I didn't say anything to discourage you from doing something dangerous,
  20. Hero999

    audio amplifiers

    It looks like it should work. Have you looked at the datasheet for the LM3876/86?
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