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Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by cowboybob

  1. cowboybob

    Circuit including a solar cell?

    Thanks for the catch, rj... Corrected schematic: .
  2. cowboybob

    Circuit including a solar cell?

    Typically, the forward voltage of an LED is between 1.8 and 3.3 volts. Judging by the battery complement above and that the , I'd guess 3.3VDC Within limits. Generally, max LED output is determined by rated max forward voltage of the LED The ground symbol () is only shown because the...
  3. cowboybob

    Circuit including a solar cell?

    Welcome to ETO, Kwells7504! How much are you willing to spend? Reason I ask is that **broken link removed** is probably the cheapest you'll find with all the parts needed to make what you have described. And no soldering necessary, just "wire nut" it all together: Its $19.95 plus shipping. I...
  4. cowboybob

    Quick electronic repair question

    Point taken, Nigel. I was in a bad mood day before yesterday... But in my defense, I would have straightened the resistor's leads to make right angles... :wideyed:. Well, I interpreted this comment: as indicating that the cradle had at least been working for a while (who knows for how long).
  5. cowboybob

    Quick electronic repair question

    The noted component below (R3) has been replaced with the external resistor (rather sloppily, IMHO) and the replacement has obviously gotten pretty hot. A properly designed circuit would not normally over heat the components. Perhaps the baby monitor's battery is defective? The replacement...
  6. cowboybob

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  7. cowboybob

    Help me choose a linear actuator

    Since it is a sliding gate you're intending to automate, you'll need (obviously) an actuator that has the "reach" (or "throw") that will fully open/close the gate. That said, Amazon has a product that seems to meet your specs and at a very reasonable price....
  8. cowboybob

    TV Remote eating batteries

    Welcome to ETO, Manaco! Where were you 11 years ago??? :rolleyes: Anyway, thanks for proving the point... :)
  9. cowboybob

    Summer time = desoldering time (mass removal by heat gun)

    Proper ventilation: ideally, a ventilation hood. Even though they may be invisible, the stuff that off-gases from PCBs is very bad for your lungs... And did I mention a ventilation hood?
  10. cowboybob

    Confused about witch job style to follow ?

    Obviously very difficult for us (or anyone, for that matter) to advise you on a career choice. Just off the top of my head, I'd suggest keeping the "Methods" job (had to look that one up... :)) since you're already trained in that. Then start the task (on your "off time") of becoming competent...
  11. cowboybob

    CAPACITIVE TOUCH SCREEN

    Glass thickness is an issue. That will determine to what degree the circuit will respond, if at all... Best to just try it and see what happens.
  12. cowboybob

    Part Identification

    Welcome to ETO, rb! We'll need more context to even guess. What is the function of the board it is on? Can the board be identified (part number, etc). Is there a schematic available for the board? I was unable to find any data from the numbers on the device.
  13. cowboybob

    110V ACDC PCB - change to 220V

    Can you provide us with a another JPEG (same dimension) of the reverse side of the board? It would allow an examination of the circuit and an estimate of any possible changes that might meet your goal.
  14. cowboybob

    110V ACDC PCB - change to 220V

    This seems like a cheap and easy solution.
  15. cowboybob

    Converting Current output from DAC to voltage using op-amp

    I'm really just guessing, but the circuit looks like it would respond (as you wish) by adjusting Rx and/or Ry, thereby altering the voltage division ratio.

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