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  1. Externet

    How many 12 volt Batteries would I have to hook up to run a clothes dryer and two sum

    If you are trying to use your domestic clothes dryer, look at the plate in the back; it will tell you how many kilowatts the power source has to be capable of. It is about watts, not volts. A battery bank would be that many watts capable for the hours of operation, plus conversion losses...
  2. Externet

    Phone Jack light!

    Many ways to do it. From simply connecting a up to 40mA LED directly to the telco line at the proper polarity, and render your telephone line inoperative in exchange to have a pretty light on; or other ways, as to tell if the line is busy ; by connecting a 15 V zener and a resistor in series...
  3. Externet

    a simple alarm

    :) ---> http://www.amazon.com/ZOMM-Wireless-Bluetooth-Speakerphone-White/dp/B003N3J6F6/ref=sr_1_7?ie=UTF8&s=wireless&qid=1282623927&sr=8-7
  4. Externet

    Using a computer monitor as a tv?

    :) ---> http://www.amazon.com/Digital-Atsc-HDtv-Tuner-Receiver/dp/B001IWOB36/ref=sr_1_1?s=electronics&ie=UTF8&qid=1282623633&sr=1-1
  5. Externet

    A project on piezoelectricity

    ----> LTC3588-1 :)
  6. Externet

    LED shirt - Need help

    Get your bib on, you will drool... ---> http://www.dealextreme.com/search.dx/search.shirts Or buy one to dismantle to pieces to see how it works.:rolleyes:
  7. Externet

    Chi Mei LCD panel inside TV

    Hi. Thanks for replying. Sorry, have no camera, or I would have done it. The circuit is an upconverter to supply LCD circuits, nothing to do with high voltage nor backlighting. Probably around 12-24 Volt out:confused:. Packed in about 15mm x 15mm of board area. No electrolytics, only the...
  8. Externet

    Chi Mei LCD panel inside TV

    Hi. Feels painful to dump it; found a couple of smoked parts -Coil and transistor in a DC-DC upconverter circuit.- Of course they blew up to protect its surface mount fuse nearby on the display panel board (Not the receiver main board) I know the DC-DC chip takes 5.1V input and upconverts to...
  9. Externet

    555 timer internal working

    This may be of help: http://www.unitechelectronics.com/NE-555.htm
  10. Externet

    simple light circuit

    OK. 4 activating NO switches, 4 resistors, 4 leds (---|>|---), one buzzer disabling NC switch, one buzzer +12V------------NOswitch-----------A----------1Kohm resistor-------------|>|----------------(-) A-------------------(Anode)1N400x(cathode)--------------------B A connects to A...
  11. Externet

    Mystery mark on battery pack

    Probably temperature sensing terminal, to control charge/discharge rate.
  12. Externet

    simple light circuit

    Hi. +12V------------NOswitch-----------A----------1Kohm resistor-------------|>|----------------(-) A-----------NCswitch------------buzzer*-----------------(-) (A connects to A) * =...
  13. Externet

    Sears VCR

    Have you confirmed if the reels are really stopped or moving ? Can be bad casette, the motor, the brake did not release, the supply to the sensor, the sensor, the sensor signal recognition, the stop actuator...
  14. Externet

    Heater element control

    :) ----> http://www.quasarelectronics.com/smart-kit/1134-automatic-mains-light-dimmer-230vac-2kw.htm
  15. Externet

    normal closed switch interface+status led

    Left schematic: The led in parallel to the switch as you have it is fine, but, The switch would not dissipate energy. The resistor would dissipate ~5mW, and the led would barely turn on with 4.7K when the normally closed switch is pushed. The level at GPIO would not be 5V when the normally...
  16. Externet

    Relay Help - 8.5 VDC

    Your +8.5V------------|>|---------|>|--------|>|----------6 V relay---------------gnd
  17. Externet

    Making lights flash to music?

    If the led light bars are meant to work on 14 V DC car power, this may work: Connect the light bar to the car battery and measure the current at the (+) led bar wire. Connect a bridge rectifier ~ and ~ to a car speaker wires pair Connect the bridge rectifier output (+) and (-) to the...
  18. Externet

    Music Response LED Necklace

    You only need an audio amplifier. Depending on its output level (and power supply) you connect leds in series or in parallel to it. All leds should be paired in counterparallel. Audio (+)----------------|>|-------------------(-)audio Audio...
  19. Externet

    LED circuit help?

    Hi. Put your bib on, pick one, find the clear tube. ---> http://www.dealextreme.com/details.dx/sku.9073 ---> http://www.dealextreme.com/details.dx/sku.39240 ---> http://www.dealextreme.com/details.dx/sku.41523 ---> http://www.dealextreme.com/details.dx/sku.13087 --->...
  20. Externet

    how to make a circuit to detect a certain frequecny?

    I do not have your explanation clear enough. If all 4 transmitters are active, you want to know which are reahing the receiver, or want to decode the modulation of one of them ? In other words, the receiver is getting one or more signals; do you want to discern which is/are being received...
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