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  1. AnalogKid

    74LS160 COUNTER - 0 to 999999

    In the upper schematic, you have Vcc dead-shorted to GND. Also, the six WR- inputs are connected together, but that net is not connected to anything. ak
  2. AnalogKid

    74LS160 COUNTER - 0 to 999999

    Another hint, just so you know the size of the final circuit - you are looking at around 15 IC's. ak
  3. AnalogKid

    How to boost 2v - 4v, 50mA - 100mA to 5v 500mA?

    The product page says the conversion efficiency is 97.5%. It is not. That is a theoretical maximum based on a specific set of input and output conditions, *none* of which is specified. It should be able to deliver 80% efficiency, but as above, 87% will be tight. ak
  4. AnalogKid

    In need of direction...

    The delay part can be as simple as 1 resistor, 1 capacitor, and 1 small MOSFET. But The light will not snap on after the delay, it will come on slowly enough to see that it is coming on slowly. If you want it to snap on crisply after the delay, then for a simple one-off project I would go...
  5. AnalogKid

    In need of direction...

    How long a delay? User-adjustable? Led part number / datasheet The switch action you describe is called alternate-action. This can be done mechanically in the switch, of with an electronic circuit that takes closures from an ordinary momentary switch and produces a signal that toggles on and...
  6. AnalogKid

    Basic transistor switch

    Back in my PIC days . . . I won't say it was the hardest part, but the part I least looked forward to was figuring out all of the register configurations at the start of a project. Yuk then, yuk today. ak
  7. AnalogKid

    WallWart conversion...

    No, it does not. Why do you think it does?
  8. AnalogKid

    WallWart conversion...

    Post #18 has 11 statements, and 9 of them are incorrect. ak
  9. AnalogKid

    WallWart conversion...

    It does not. The output impedance of your wall wart is less than 1 ohm. ak
  10. AnalogKid

    WallWart conversion...

    I wouldn't. Please post a clear image of the power connector area on the camcorder. Also, somewhere on the camera body, maybe on the bottom, there should be a sticker, plate, or molded-in text defining the input power requirements and model number. With a clear image of that we might be able...
  11. AnalogKid

    WallWart conversion...

    There are many ways to decrease the value of a voltage source, and they all fall into two categories: linear and switching. Both dissipate heat, one more than the other. With *any* linear technique, the power dissipated in the voltage reducing circuit will be, worst case, 2.88 watts. If this...
  12. AnalogKid

    WallWart conversion...

    Yes, but not well. The rating on the wallwart is its max continuous output current. Your device will draw less than this, and depending on the wallwart's internal circuit, the output voltage may vary inversely with it. The main issue is that the device current will not be constant. For...
  13. AnalogKid

    Automatic DC supply selection?

    Post #2 Shottkey diodes are a first step, but they will not give you the protection you want during change-over. There will be a point when both diodes are conducting because the output voltages of the two groups of panels is almost exactly equal. This is done on purpose when current-sharing...
  14. AnalogKid

    Need a little help understanding the way my class AB power amplifier works.

    R10, R11, and Tn3 perform as a zener diode. This replaces the diode-bias technique you are familiar with. The temperature tracking is not as good as four diodes in series mounted on the power transistor heatsink, but you can adjust the resistor values so the voltage drop across the transistor...
  15. AnalogKid

    Identify 1960's Diode Manufacturer By Logo?

    I forgot the question.
  16. AnalogKid

    Timer circuit

    A better analogy is that there is a fixed amount of total money (heat), and you get the same amount of money over 8 hours, whether you take all 400 in the first hour, wait 3 hours and take200 per hour for 2 hours and then wait another 3 hours, or take 3 per hour for 7 hours and then379 in the...
  17. AnalogKid

    Timer circuit

    The good news is that absolute maximum efficiency in a system such as this is not a critical requirement. Thus, a superfluid is superfluous. ak
  18. AnalogKid

    Timer circuit

    I mentioned that. Another real-world factor that is the flow rate through the heat exchanger, whatever it is that imparts heat to the water. The slower the flow, the more the water heats up; the more the water heats up. As the water heats, the delta-T between it and the heat source decreases...
  19. AnalogKid

    Timer circuit

    Actually, Alec is correct. It gets hotter because its average flow rate is lower, and that matters. As a physical quantity of heat, the calorie has been around since the 1820's, and for much of that time it was defined in terms of a quantity of water. If you have a large amount of water, such...
  20. AnalogKid

    Timer circuit

    Per kelly's suggestion: https://www.ebay.com/sch/i.html?_from=R40&_nkw=programmable+timer+relay&_sacat=0&_sop=15 ak
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