black_wing

>>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 cound the website where i found the pdf file, but i still have it...i just dont know where to uplod it so i can link it from here

>>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.. [img width=680 height=510] [img width=680 height=510] [img width=680 height=510]

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 people using their cellular phones, my device didnot work well, can anybody tell me how to create an easy to build shielding for my device? my current casing is an acrylic glass because they required me to use a see through casing... thank you very much..

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 websites that can tell me more about it. thank you verymuch...

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....

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 will you connect the ground for the 5v input? the only thing that i'm sure of is where to connect the power for the ic (on ground on pin 7 and +Vcc on pin 14) but i don't know how to put the input source. can you help me out? thank you....

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.

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 that are used in schools). the relay is the only one left that i have no idea what to put. please help me, its just a school project for me. i'm just new to building this kind of stuff. thanx....

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