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  1. CircutScoper

    Problems with touch captive sensor

    Did you perhaps mean "capacitance" touch sensor?"
  2. CircutScoper

    Is this motor driver controller IC capable of reading position info from potentiometer?

    Technically, yes, because no tolerance on "9VDC" is stated. Practically, however, it's fairly unlikely that a "9V" adapter would be regulated anyway, so you're probably safe using an unregulated one in this case. However, if "5V" or "12V" were stated, then the likelihood of needing an...
  3. CircutScoper

    Is this motor driver controller IC capable of reading position info from potentiometer?

    An issue that I don't think has been mentioned (sorry if it has and I missed it) is that some adapters are internally regulated and will therefore produce an output that's within a few % of the number on the nameplate, while others are not and won't. The potential for disaster when mixing and...
  4. CircutScoper

    6-V to 5.2V linear regulator

    That's good news. Then all you have to worry about is its temperature coefficient -- about -0.01V/oC if it's lead-acid, although you didn't say..
  5. CircutScoper

    Diode help and general question

    Overnight charging shouldn't be too much of a problem when the source is a solar panel, anyway. :)
  6. CircutScoper

    6-V to 5.2V linear regulator

    PS: Having no idea what you think a "normal 6V battery" might be, I used 1.5V alkaline D cells as an example of a fairly "large" battery. Their typical nominal amp-hour rating is ~15AH. But as you can see from the graph above, a 6V battery made from four of them connected in series would drop...
  7. CircutScoper

    6-V to 5.2V linear regulator

    Then even if it is a LARGE battery, you will likely NOT have a true 6V for input to the regulator -- at least not for long. For example, here's a typical discharge curve for an alkaline D cell. Note the immediate drop when the load is first applied. To see what reality holds in store for...
  8. CircutScoper

    6-V to 5.2V linear regulator

    Hi, Pete Question: What's the source of your 6V input and how stable is it? For example, if it's unregulated or coming from a battery, it would be pretty fanciful to imagine that it's stable to 0.8V (13%) in the first place. Have you measured it under a 3A load or is this all theoretical?
  9. CircutScoper

    Why doesn't my circuit oscillate?

    Try decreasing R3 to 1k.
  10. CircutScoper

    I would like to power a table radio with 12V DC instead of 110V AC

    Hold the phone! Looking at the schematics you've provided, it turns out that your radio already has extensive power conditioning built in, including a voltage limiter (Q7 etc.) and a switching converter (U2 etc.). Nothing further should be necessary and a direct connection to your car battery...
  11. CircutScoper

    I would like to power a table radio with 12V DC instead of 110V AC

    So called "inverters" that convert 12VDC to 120VAC are pretty cheap...
  12. CircutScoper

    Need help repairing Microwave oven

    It seems unlikely that any fuses, relays, or interlock switches exist that would block power from the turntable and fan while still letting the magnetron run. So my guess is that age, use, and moisture have caused a simple connector or splice to corrode and fail somewhere in a circuit path...
  13. CircutScoper

    Design of multistage audio amplifier

    LOL! Don't look now, but methinks WHONOES's 2.484 was considerably closer to correct than your 121. Your 2.848 ain't too terrific, neither. Meanwhile, a MOSFET H-bridge output topology could probably (just barely) do the trick from only 5VDC.
  14. CircutScoper

    Design of multistage audio amplifier

    Shouldn't that constant for Vpp from Vrms = 2 x sqr(2) = 2.828?
  15. CircutScoper

    Design of multistage audio amplifier

    I suggest you start by calculating the peak-to-peak output voltage required to push 1W RMS into your 12 ohm speaker. This, combined with the 20mVpp output of the mike will allow you to calculate the necessary cascaded voltage gain of your gain and output stages, and the minimum supply voltage...
  16. CircutScoper

    Projector Power Supply

    You'll probably need to buy two supplies -- one for each of the two different voltages, then splice them into the projector's connector. Here's a selection from one random source -- Amazon...
  17. CircutScoper

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    You're a girl? Well, at least that explains your interest in hairdos. And salads.
  18. CircutScoper

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Sadly, no. You present an irresistible temptation. :mad: For example, here -- where you seem to have forgotten that my comment about "silicone" came AFTER, not before, yours about salad bowls and trolling.
  19. CircutScoper

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Of course. When you continued to persistently and ignorantly babble about irrelevant resistor tolerances even after I had correctly identified the actual problem with the inaccurate simulation (a bogus model with an erroneous trigger voltage) I should have been much more patient. After all...
  20. CircutScoper

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Was I? True. My response to your polite comments about salad bowls and trolling could have been much more civil. Please forgive me.
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