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  1. Herschel Peeler

    Super Simple Circuit questions

    Next step then. Attached is a data sheet for the LM555. It can be configured to create a string of pulses or a single pulse. Shown is the basic single pulse deign. Timing is controlled by the 470 uF capacitor and the 390K resistor. Pin 3 is the output. It goes high when the trigger input is...
  2. Herschel Peeler

    Super Simple Circuit questions

    Retriggerable? Why? LM555 is okay and cheap. Battery powered? What LED did you have in mind? Here's a starting point. With a 390K timing resistor I get about 2 1/2 minutes. With a 430K I get about 3 1/2 minutes. Specifics depend mostly on how close your 470 uF cap is. Total cost for parts shown...
  3. Herschel Peeler

    Math Question, How Do You Really Figure This Out

    Good observation. Forget precision. Settle on any one. Use a 13 ohm 5% resistor and let the current settle where it will.
  4. Herschel Peeler

    LED Circuit Help.

    Something like this?
  5. Herschel Peeler

    SAFE Regulated Power Supply

    I don't see any that look like 800 Watts. That is about 67 Amps at 12 V. Googling, they run about $200.
  6. Herschel Peeler

    Old IC chips

    Not much unless you have pounds of them. There is only a breath of gold on them.
  7. Herschel Peeler

    Hello, Welcome! (Introduce yourself)

    Welcome from Herschel in North Las Vegas. A retired slot machine tech and teacher.
  8. Herschel Peeler

    Old IC chips

    DG511 sounds like a FET switch. NS54LSxxx is military quality temperature range of 74LSxxx. Most of the others I couldn't read. an you post text of what is on them? I have a lot of references for old chips, non-74xxx TTL, DTL and such.
  9. Herschel Peeler

    Hello, Welcome! (Introduce yourself)

    That would be difficult I think. There are broad categories, military, aerospace, industrial and commercial. The parts used in slot machines are about the same as those used in personal computers, voting machines ...
  10. Herschel Peeler

    Creating 5V DC

    Yes, 4 nimh D cells (about 10,000 mAhr), or 3 D cells alkaline. 4.5 V is close. D cell alkaline are capable of 10,000 mAhr. How many heaters did you plan to run?
  11. Herschel Peeler

    I want to design using by cascading 74*163 ic

    Pins 1, 2 and 9 have no input. Yes, they need to be connected together, but they need an input from something. The Preset inputs need to be either high or low, not floating. If this example is good for you, I have most TTL and CMOS chips done up this way. I used to teach this stuff. [MOD...
  12. Herschel Peeler

    Shift Register circuit validity

    I had to try it to test it. Yes, it will probably drive the display as is, depending on the efficiency of the display.
  13. Herschel Peeler

    Hello gents

    Bad capacitors.
  14. Herschel Peeler

    power supply

    Many possibilities but most likely is the lighting that lights the screen, or the high voltage converters that drive the lights.
  15. Herschel Peeler

    Shift Register circuit validity

    4094 can only drive about1 mA high. What is your 7 segment display like? You might get a little brightness out of it.
  16. Herschel Peeler

    xmas present: blinking ring

    Same source as the LED, Electronic Goldmine. G16909.
  17. Herschel Peeler

    Drone followers

    How long a flight time does your drone have?
  18. Herschel Peeler

    Do timers timer?

    The 555 is not a Timer in the sense as the term is used in a microprocessor.
  19. Herschel Peeler

    2N3055's and heat

    I have never seen an LM317or LM338 working at over 35 V in.
  20. Herschel Peeler

    Advice needed for an 100W LED

    I don't know if it applies to your LEDs but I use a lot of high wattage LEDs (10 to 20 watt range) and I just use a regulated voltage, adjustable when desired. The 10 watt LEDs are said (by the distributor) to run on "9 V to 12 V". 10 Watts I take to mean at about 1 Amp. For a dimmer I use a...
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