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  1. (*steve*)

    Resistance and Inductance

    Or for calculators with dubious handling of precidence but having a memory: 1 / 100 = STO 1 / 22 = + RCL = STO 1 / RCL = I love my RPN calculators. It makes all this nonsense redundant.
  2. (*steve*)

    Telequipment S51B Oscilloscope

    Replacing like with like is the best thing. If you have pictures of the old one we can try to confirm the type.
  3. (*steve*)

    Where to buy EPROM window stickers?

    Look up "copper foil tape adhesive" on eBay. It looks like it could do the trick nicely. I've seen it in a lot of widths 3mm, 6mm, 20mm, 50mm, 100mm,... 10mm would probably be ideal, but my brief look didn't show any. Beware that there seem to be w wide range of prices for what seems to be...
  4. (*steve*)

    Motion detector circuit

    You could make a regular 555 oscillator and is the part of the circuit driven by the photo transistor to control the rest signal of the 555. This way the 555 will not issue until the been is broken. If you want to use a buzzer then the 555 is almost superfluous
  5. (*steve*)

    A simple way to make an oscillator+amplifier+antenna circuit for very low frequencies?

    At 100Hz, an optimal antenna will be about 750km high. A ground plane of about 2 million square kilometers should be sufficient.
  6. (*steve*)

    Driving a VFD Display

    One other detail is that there is typically a specified range of current (as well as voltage) for the segments. The voltage range ensures that the segment will light but is low enough not to flash over to other segments. The current determines the brightness. Too low and the entire segment...
  7. (*steve*)

    Schmitt Trigger Help

    I found the examples in the TI datasheet to be clearer. Looking at both datasheets will give you a better idea of what's going on.
  8. (*steve*)

    Help - Hardware suggestions for programatic PWM

    Look at stepper motors. They will allow you to make a reasonable conversion between steps and distance, but errors will accumulate unless you can periodically reset your location to a known place.
  9. (*steve*)

    Help me design a water heater circuit that automatically turns-off when the heater reaches a boiling

    You need to be very careful about setting the upper temperature to 100°C. If inaccuracies or drift cause it to increase, you may have the problem of it not turning off. Setting the upper limit to (say) 95°C can save you headaches and energy. Heating water is not exactly exotic, you may be...
  10. (*steve*)

    Schmitt Trigger Help

    Firstly, always sure the positive rail at the top, and the negative rail at the bottom. The next thing to do is to look up the LM311 datasheet and see what to do with those two outputs. Then you can do the normal magic to create a Schmitt trigger. Please feel free to discuss what you find...
  11. (*steve*)

    Resistance and Inductance

    No.
  12. (*steve*)

    Creating a HID USB device

    An Arduino isn't as different from a microcontroller as you may think. Many microcontrollers these days have a native USB interface.
  13. (*steve*)

    Telequipment S51B Oscilloscope

    http://www.digikey.com/product-detail/en/avx-corporation/SV07GC473KAR/478-4049-ND/1144427
  14. (*steve*)

    Where to buy EPROM window stickers?

    Unless you're planning to leave the EPROM out in the sun, paper stickers (or no stickers at all) should be fine. Do you want metallic stickers for that cool look, or something else?
  15. (*steve*)

    Motion detector circuit

    I use digikey's schemit. It's good for display purposes
  16. (*steve*)

    Address bus and program instructions

    Yep.
  17. (*steve*)

    Address bus and program instructions

    The program memory is 24 bits wide, so the next address is 0x0002. A very quick google search would have revealed this. You want the first sentence on page 2.
  18. (*steve*)

    how to overclock a usb plasma ball?

    Really?
  19. (*steve*)

    Motion detector circuit

    Here's a better drawn schematic: And immediately it becomes obvious that if you reduce R3 to the minimum you will fry the 555. And here is the solution: I will leave it to you to redraw the first one to make it easier to understand. Even if you can't read a circuit diagram, I hope...
  20. (*steve*)

    Motion detector circuit

    No, Look in the circuit in your original post and do what I suggested. I DID NOT suggest you remove R1 or Q2. edit: AND you changed the wrong circuit!?!?! Our understanding (and probably yours too) will be improved if you make your layout neater. Vcc and Rst in this case can be drawn at the...
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