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  1. Chemelec

    capacitor

    Yes but the Simple Answer is available on Google.
  2. Chemelec

    555 pulse generator

    How are you Measuring that output Voltage? A Multi-Meter is Not very good for LOW Frequency. An Oscilloscope would be Best!
  3. Chemelec

    Diode across Peltier to prevent reverse function

    Adding the Series Diode Will prevent Back flow into your Drive Circuit, But it will Not improve efficiency. And "I seriously doubt it could affect the Circuitry of your System". And it is not possible to re-route this power back into the Peltier.
  4. Chemelec

    need help please

    And are they really VALAD, Especially to your Problem?
  5. Chemelec

    need help please

    Why do you think a DIODE will Filter out that Noise?
  6. Chemelec

    Capacitor Voltage Divider

    They do not have applications in the car as manufactured. Forgot to mention, They also have applications in some Computers to help in keeping the Microprocessor Cool. I have numerous Catalogues with Data, but they are physical books, so not easily posted here. I have not had any problems with...
  7. Chemelec

    Capacitor Voltage Divider

    Usually these Peltier devices are Typically used for Small Coolers in cars or campers. Some Special ones are used for Cooling Slides on Microscopes. So to keep Frozen sections Frozen while viewing them..
  8. Chemelec

    Capacitor Voltage Divider

    At 50 or 60 HZ, you would need VERY BIG Capacitors to Pass 5 Amps and they would need to be Rated at Considerably Higher than the Line Voltage. They should also be NON-POLARIZED. I Do Not know Specifically Which ones you have?, But I Think you will find that If you supply 12 Volts to your...
  9. Chemelec

    Capacitor Voltage Divider

    QUOTE: Thinking out loud (I know mains is not something to mess with) but a pair of capacitors and diode rectifier to AC source sounds a simple (and apparently efficient) way to get a fixed DC voltage. Maybe that could be an easy way to get 15V...? If it works of course! NOT VERY PRACTICAL at...
  10. Chemelec

    Capacitor Voltage Divider

    Here is some Info for you: http://chemelec.com/Projects/PWM/PWM.htm Have you ever used Peltier devices Before? Where do you Live?
  11. Chemelec

    Capacitor Voltage Divider

    Or build a PWM Circuit to drive the Peltier.
  12. Chemelec

    Resistor Replacement

    It seems Strange that such a High Value Resistor would Burn Out. Unless it has HIGH VOLTAGE on it.
  13. Chemelec

    Looking for advice for an LED flag project

    Chances are if each color comes from One Batch, they are usually fairly Close to the same specs. I Don't mean: Red, Whites and Blues are the Same Batch. BUT, All Reds from one Production Batch. All Whites from Another Production Batch. All Blues from Another Production Batch. And If you buy a...
  14. Chemelec

    Looking for advice for an LED flag project

    QUOTE: Would it just look average to bad or is there some fundamental flaw that I'm not understanding that would cause a section of the LEDs to go out? Possibly you supplied too much current.
  15. Chemelec

    Looking for advice for an LED flag project

    Your Calculations don't appear Correct. 1) It appears those LED are all rated at 20 mA. So you need to determine How Many of each, you can put in a Series String so they add up to Somewhat Less than your 18 Volts. Note Different colors also have Different Voltages. 2) Than you need to Add a...
  16. Chemelec

    Buck converter help

    Remove some windings to get a Lower Output Voltage. Probably Better than using a Regulator.
  17. Chemelec

    Looking for advice for an LED flag project

    18 Volts, But I Don't see Where it gives a CURRENT RATING?
  18. Chemelec

    Lamp: Will it burn my house down and kill me?

    These Bulbs also Create Ozone. No problem if you just use them Occasionally, But it is Not good to get too much Ozone.
  19. Chemelec

    Please explain circuit

    I Designed up a similar circuit back in 2004. The 4 Digit Combination MUST be entered in Proper Sequence. And hitting any Reset button, Resets it. Can be built with Switches or Touch pads, and Switch Bounce is not a problem. The Schematic. http://chemelec.com/Projects/Lock/Lock-1.png Complete...
  20. Chemelec

    Resistors or not?

    Resistor, Not Likely it is built in. Mainly because the resistor will depend on your Supply Voltage.
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