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  1. Steve_hi

    Help With Ground Please

    Hi I made an ECG and when I do a continuity test for the positive battery terminal and the # 8 pins of the TL072's i have continuity, but not on the center tap of the 2  9 v batteries, and when I check for continuity of the negative terminal and the number 4 pins of the op amps ihave continuity...
  2. Steve_hi

    Laying out a strip board

    Hi I would like to know if there is a shareware program that i could use to layout the components of a circuit on a computer and print out the actual layout of where to place the components because a schematic doesnt show where to place them in real life. I hope you know what I'm trying to...
  3. Steve_hi

    Timer with Beeper for Intravenous Drip

    Does any one have a schematic for some sort of timer that could recieve an input such as 17 then beep 17 times per minute. I would like to have something like this to assist in setting the drips for an intravenous it would be easier than trying to watch the second hand of a watch and count the...
  4. Steve_hi

    Using a power supply salvaged from a DVD player

    Hi. I have a power supply from a DVD player which has 2 grounds, 5V+, 12V+, 12V- and another 5V+ and another pin for CN 1)  what is the cn pin for? 2) Can I tap into the 12V+ and 12V- and make a junction to have 9V + and 9V- what components will I need? 3) Can, and if so what should I do to...
  5. Steve_hi

    Capacitors

    I read that a capacitor should have a value of at least twice the input voltage does this mean that only the capacitance is important and the voltage could be any value as long as it is twice the input voltage? and with resistors does it matter if it's .25 watt or 5 watt as long as the...
  6. Steve_hi

    PerkinElmer Cetus 480 Thermal Cycler

    I bought a thermal cycler from a lab auction for 10$ the company that made it wants $5,000.00 For a service manual YES $5,000.00 Any ideas as to how to get a copy or something from someone else what would you look for
  7. Steve_hi

    Microwave Transformer

    Could someone tell me what the output voltage & current of a transformer from a microwave would be and how to connect it Thank you
  8. Steve_hi

    Where does a beginner begin

    Where does a beginner begin. I would imagine that I'm not the only one who has decided to take up electronics as a hobby so perhaps this topic will be of interest to other as well. I have spent most of my life as a machinist/mechaic operating my own business and now I'm taking nursing but I want...
  9. Steve_hi

    E.C.G. Schematic

    Hi. I have put this cicuit together and checked it many times and cant get it to work. It's supposed to hook to a computer through the sound card and using a program provided by the author of the schematic show a wave form on the monitor but I cant get it to work I have gone over my circuit...
  10. Steve_hi

    PH meter

    Looking for schematic and parts list to make pH meter capable of measuring 0 to 14 ph preferably with a 12 vdc power supply Thank you
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