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  1. AnalogKid

    find resistance r1 and r2 if only vin and out is given?

    I understand how a homework forum functions. My point is that the guidance in post #8, which I quoted in post #9, is incorrect. ak
  2. AnalogKid

    find resistance r1 and r2 if only vin and out is given?

    ?? ? ak
  3. AnalogKid

    find resistance r1 and r2 if only vin and out is given?

    Yes, they do. Show us your work, your calculations, and explain your method, and we will advise you. ak
  4. AnalogKid

    find resistance r1 and r2 if only vin and out is given?

    If the circuit does not have to deliver any significant current (for example, it is driving only a volt meter), then there are an infinite number of resistor value combinations that will do what you want. If you stick to only resistor values you can buy, then there are approximately 331,000 1%...
  5. AnalogKid

    Keyless and contactless Reset switch

    I like it and I'm going to use it blatantly and shamelessly. ak
  6. AnalogKid

    Keyless and contactless Reset switch

    Stolen. ak
  7. AnalogKid

    Solar Panel School Project

    The only way for us to discuss your circuit in detail is for us to have all of the information you have. First, post a schematic or wiring diagram showing all of your components and their connections. A circuit is almost impossible to discuss in detail using only text. Next, post datasheets...
  8. AnalogKid

    {computer}: How to add a monostable to PC PWR/Reset button?

    You are correct about the power button. An "ATX" power supply has all of the main outputs plus a small internal "housekeeping" supply that always is on even when the system is off. It powers the circuit that watches the ON/Standby" switch/button and enables/disables the main supply when you...
  9. AnalogKid

    Noise Activated Switch, with a Difference.

    A standard shortcut in most electronic schematic drafting packages is that the suppress power and ground pins. This goes back to days of discrete digital logic with dozens or hundreds of symbols on a sheet. Eliminating the stuff "everybody knows" removed a ton of clutter to make things...
  10. AnalogKid

    Removing DC offset

    Nowhere do you say what the peak-to-peak amplitude of the attenuated pulse is (sitting on the 2 V pedestal). ak
  11. AnalogKid

    Removing DC offset

    The -200 mV level could be a scope misalignment. Even if not, it is not a large enough undershoot to cause problems with a PIC input. So I don't think you need the series diode. A text description doesn't convey enough information. Please post a schematic showing the signal source...
  12. AnalogKid

    Resistor in TTL Circuit

    Are you sure the original IC for that Lab was a 7400? Two things ... 1. A 7400 quad NAND does not need a pull up resistor on any output. However, some other part that was RTL or DTL might. 2. A true 7400 gate needs a lower resistance to GND to guarantee a logic 0 at an input. The classic...
  13. AnalogKid

    Photo sensor

    What is the "analog output" used for? ak
  14. AnalogKid

    Quiz Show answer box --- Why won't second bulb come on?

    When S2 is pressed, Q2 saturates. This makes the voltage at the Q2 collector approx. 0.1 V. The Q2 collector also is the voltage source to turn on Q1 when S1 is pressed. BUT, if S1 is pressed second, there is only 0.1 V available to turn on a transistor that needs 0.6 V at the base. Thus...
  15. AnalogKid

    Switch for 110V 16amp AC

    Bouncing around digi-key, 24 A limit switches are more common than 20 A pushbutton switches. A more industrial distributor like Newark or Allied probably will have more of both. Ak
  16. AnalogKid

    Airplane transmitters/receiver

    CTP - where in the world do you get your information. No one repairs anything on an aircraft while it is in flight. Ever. Air traffic communications do not use GHz carrier frequencies. Neither does anything else interacting with an airplane in flight. The speed of an aircraft does not affect...
  17. AnalogKid

    Switch for 110V 16amp AC

    Carling, Arrow-Hart, Switchcraft, Eaton...
  18. AnalogKid

    My old high school gym

    Go down to the corner, turn left, go 2 miles. It will be on your right, just past the gas station. You can't miss it. ak
  19. AnalogKid

    Boost low volts at a few amps

    To reduce heating problems, use a module that can deliver twice your required output current. If you need 3 A out, use a module that can deliver 6 A. Several reasons for this, but #1 is that the #1 killer of electronics is not plugging it in backwards, or static electricity, or even power-on...
  20. AnalogKid

    Boost low volts at a few amps

    $5, free shipping, 100% overrated - that's where I'd start. ak
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