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  1. Steve_hi

    0-30 Vdc Stabilized Power Supply

    I've been reading this thread and I see that there has been a significant amount of problems with this project heating up, with the schematic that is posted in the projects. I also see that audioguru has provided an updated parts list can some tell me why the person who maintains the projects...
  2. Steve_hi

    0-30 Vdc Stabilized Power Supply

    Hi I think I would like to try to make this 0-30Vdc power supply does anyone have a rough idea about how much it might cost
  3. 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...
  4. Steve_hi

    PH meter

    also it is asking for 100k resistor + 3500 ppm Note 12 style 144 I dont know what this means
  5. Steve_hi

    PH meter

    I checked digi key for part LM4040D1Z-2.5but they have no listing for it is there some thing that could be substituted for it Also the resistors that are listef for sale do not match those asked for by the schematic what does one do for this situation choose the closest one to it or is there a...
  6. Steve_hi

    PH meter

    I have one but there are some parts that when i try to order them from futurlec they dont seem to have them there are all kinds of resistors that dont have the same values and a diode too
  7. Steve_hi

    Electronic lab kits for learning?

    I considered buying the kit with 300 projects. But when you see what you get, it a fancy breadboard with very few electronic components I opted for choosing a project from the web I just completed my first project an electronic stethescope "with a lot of help from Audioguru" Thanks. Audio. Any...
  8. 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
  9. Steve_hi

    Electronic Stethoscope

    Hi Guys Just to let you know I just completed Stethoscope 2 and it works well I do have however a constant hum coming from my hesdphone does anyone know if it would be resolved with a better headphone or would it not accomplish anything. thank you for your reply
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