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  1. (*steve*)

    transistor equivalents

    Measure those resistors both ways around whilst in circuit. Replace them if the reading in either direction is more than 105% of the marked value. The one right near the zener (if open) may be your problem. But I bet you wont be that lucky.
  2. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    I'm just leaving for work...
  3. (*steve*)

    transistor equivalents

    R29 and R36 are worth a look at too.
  4. (*steve*)

    transistor equivalents

    R8, R10, and R18 appear somewhat discoloured. Are any of them damaged?
  5. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    I am now
  6. (*steve*)

    HELP: project not working

    Try 1k
  7. (*steve*)

    transistor equivalents

    It's probably better to troubleshoot than to just replace stuff until the fault is fixed. Has the fault changed at all with all the replacements you've made?
  8. (*steve*)

    transistor equivalents

    These parts are now obsolete (try going to digikey and search for topfet). Finding them may be tricky. You need to be sure they have failed, and if so, they won't fail again immediately you replace them.
  9. (*steve*)

    HELP: project not working

    Well, that datasheet tells you what you need to do.
  10. (*steve*)

    transistor equivalents

    Can you post the datasheets and indicate the purpose you're using these devices for.
  11. (*steve*)

    Usb to 232 driver problem

    Google for "prolific USB serial win 8.1 driver"
  12. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    Yeah we know you're in a funny place. Get back to us when you can. Don't hurry on our behalf.
  13. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    Now you have a working 317 circuit, you can use it with the 9v battery (and probably with one of the burnt pots) to check to see if any of your discarded 317s are actually OK. Then we'll do some simple tests on your 2N3055's to see if they're ok or toast. I'll draw something up this evening.
  14. (*steve*)

    Can you identify this lifeform?

    No, that is the Sonic Manipulator with his Claudatron Mk:2. I have assisted in a very small way in some of the microcontroller stuff.
  15. (*steve*)

    Electronics certification

    Yes, that's right.
  16. (*steve*)

    Electronics certification

    Do you have the faintest idea of what you're doing? Because I don't.
  17. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    It's something good to know about your meter. On the internet it can be even more useful to know it about other peoples meters. Perhaps we need to get people to measure batteries using the AC range on their meters whenever we have these sort of issues.
  18. (*steve*)

    50Hz sine wave

    If you have 50Hz mains then you could use a transformer.
  19. (*steve*)

    HP 54510A X-Y Mode

    Check this. (Sorry, Keysight, not Agilent) Looks like the math functions are +, -, invert and vs (see page 15). The last of these is the X-Y function.
  20. (*steve*)

    Help with circuit (voltage doubler)

    The even simpler way to describe it is to imagine all caps are discharged. Then consider the case on Vin being negative wrt ground. C1 is charged to -Vin (the negative end is at the point labelled Vin) Now, when the point Vin is +ve, this voltage is added to that on C1 is seen by C2. After a...
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