Recent content by black_wing

  1. black_wing

    need help on noise protection

    >>audioguru by the way sir.... the circuit is not for ECG...its for EMG.. the circuit's original design is to generate a sound when you contract your voluntary muscle...i just replaced the two 250Kohm pot with two 1Mohm pot. i also removed the Q3, R13, and the speaker... i could not...
  2. black_wing

    need help on noise protection

    >>audioguru here are the immages of what i have made... the device will be connected to the computer via the parallel port.. it accepts input by connecting it to the human body by the use of an electrode..
  3. black_wing

    need help on noise protection

    i created a project for my subject in my school and found out that it was prone to noise comming from other devices especially cellular phones. when ever i try my device on my home, it works perfectly, but when i brought it to our school in a room with other computers and aircons and with some...
  4. black_wing

    amplifying voltage produced by muscle movements

    can anyone help me... does any one knows how to make a circuit that can amplify the voltage produced by the movements of our muscles that is easy to make and is low cost, so that if I connect it to a transistor switch or other switching devices, it can triger somethig to move... if you know any...
  5. black_wing

    part replacement

    is there any part that can replace LM353? because, there is no part like that here in the philippines. i'm asking this because i want to build the stereo mixer in this website http://home.maine.rr.com/randylinscott/may20.htm and LM353 is no where to find here thankyou....
  6. black_wing

    turnign an led on using ic

    how do you make a logic high(1) on a 74LM86 (XOR) ic so that it can turn-on a simple led using a 5v input on inputs pin 1 and pin 2 and the output is on pin 3? how do you connect the 5v supply on the two inputs? is the +5v connected to the input pins? where will you connect it? and also where...
  7. black_wing

    relay

    it's ok now, i have decided to just use a 12V relay, becouse its hard for me to find for a 5v relay in my place. MP I did use a transistor for turning the relay on/off.
  8. black_wing

    relay

    is there a relay that if feeded 5V it will be turned on and 220V will be the voltage to run through the relay? if there is what can you suggest? i'm asking this because i'm making a device that will connect to the parallel port (aka printer port) of a computer that will controll a bell (bells...
  9. black_wing

    operational amlpifiers

    can any one tell me the different manufactureres of op amps and their codes for them. thanks....
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