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  1. Herschel Peeler

    555 IC not amplifying enough

    Maybe something like this for the output. I haven't tried it yet. A lot depends on what timing you want. The capacitor charges while the output of the 555 is low and discharges when the output goes high. So the 555 timing should be appropriate.
  2. Herschel Peeler

    555 IC not amplifying enough

    I think what he is trying for is a strong output pulse from the discharging of the capacitor at the output, but when the output of the 555 goes low it kills that.
  3. Herschel Peeler

    Exam question help please?

    Keep it simple. It is a basic class. Turning on the switch makes the light go out. (And blows up the transistor?) Bad example of a question.
  4. Herschel Peeler

    555 IC not amplifying enough

    So when the output of the 555 goes low what is supposed to happen?
  5. Herschel Peeler

    Oscillating Leds circuit anywhere?

    Oscillating LEDs? Do you mean blinking? Or are you talking about the color of the LED as the oscillating frequency?
  6. Herschel Peeler

    555 IC not amplifying enough

    The 555 looks like a good circuit. I'm not sure what you are trying to accomplish with the rest of the circuit. What do you mean "amplify"?
  7. Herschel Peeler

    Solar yard light stopped working

    The LED probably won't light at 1.2 V. The 8-pin IC may be the answer, Does it have a number on it like LM3909? This is an LED flasher chip that adds a charge on a capacitor to the 1.2 V battery to blink the LED.
  8. Herschel Peeler

    Clarification on LED millicandela and light output

    Fascinating!
  9. Herschel Peeler

    Clarification on LED millicandela and light output

    Calculations are a theory only. Forget the math and adjust the resistor until you get the brightness you want.
  10. Herschel Peeler

    Test Rig, Need Advice

    Sounds like time to visit a junk yard and buy a door and BCU.
  11. Herschel Peeler

    Specification for my custom CPU

    I'm not a gamer but that doesn't sound like a state-of-the-art (2017 era) system to me. Considering it will take you a year to get into production. By the time you got it built it would be obsolete. Find out what systems are being designed for next year and build for that.
  12. Herschel Peeler

    Complete electronic virgin!

    Did you have a target price in mind for this? Maybe $4,000?
  13. Herschel Peeler

    Location devices

    One or both ends battery powered? How long for the batteries to last? A low power RF link sounds appropriate for this. Do you imagine this as a product for sale or just one personal item? Did you have a cost in mind? How about size?
  14. Herschel Peeler

    looking for feedback on feasability of this idea...

    If it doesn't look like a solar cell is going to be cost effective for you a line powered system is simpler. How many plants are we talking about?
  15. Herschel Peeler

    looking for feedback on feasability of this idea...

    A 2,300 mA Hr battery can supply 100 mA at 12 V for 23 hours (or equivalent, maybe 1.2 watts per plant to a few plants for a few of the coldest hours per night). As mentioned, water is a good idea. Heater in water might work. Pure distilled water does not conduct electricity.
  16. Herschel Peeler

    looking for feedback on feasability of this idea...

    For a starting point on solar cells and batteries, here is a solar cell suitable for outside use and a battery pack. These from Electronic Goldmine. You can google that to get a web site.
  17. Herschel Peeler

    looking for feedback on feasability of this idea...

    Available power is the problem. The solar cell only puts out about 0.1 Watts. (3.5 V at 20 mA). What you need is a few watts. A circuit is no problem. A modified night light circuit is attached. The sensor is changed, as suggested. A negative temperature coefficient sensor is used. As...
  18. Herschel Peeler

    Regarding diodes

    1) Nothing special. The output is still the same. 2) Yes, it would but would only work at a low voltage and current. Like 4 V and 20 mA. And be a high loss rectifier dropping far more than 600 mV a diode would.
  19. Herschel Peeler

    Help needed on simple short circuit protection

    Not intended to be anything other than a starting point. Another problem is the source of power to the chips. Is 6 Volta available? A simpler but slower solution is a self resetting fuse. At a certain current (heating point) they pop into a high resistance, then return to normal low resistance...
  20. Herschel Peeler

    What do people stick their self-adhesive breadboards to?

    I stick mine to a small board. 3" x 6" x 1/8". This board screws down to a wooden box with power supplies and other circuits. After a lot of use the breadboards start having problems with pins that get damaged and the board needs to be replaced. It would be a pain if the breadboard itself were...
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