Recent content by Herschel Peeler

  1. Herschel Peeler

    Responding to an older post on the MC1385P.

    I have a pinout and application example if anybody is still interested. All Electronics has them at about $1.00 each.
  2. Herschel Peeler

    Project for interested novice that will give him most taste of electronics?

    In away you are right about starting with a big project. It depends. You can look at big project as a lot of little projects.
  3. Herschel Peeler

    Transistor voltage measurement

    If you want to measure the voltage between the emitter and the collector that is where the meter leads go. Is your question more complicated? Start with a data sheet for the transistor in question.
  4. Herschel Peeler

    Input on a DIY build

    Lets get more specific here. You want a variable voltage you can manually adjust, over what range? And you want three outputs that w\indicate when the voltage is at some certain level? What levels? Light an LED? To indicate when a voltage is within a certain range (between x and y), or just at a...
  5. Herschel Peeler

    74HC390 table of pin connections?

    The 74xx390 is two divide-by-ten counters. Each section has a divide-by-two and a divide-by-five part. So all you have to do is break down the count you want (in your case) into 2's, 5's, and 10's and use the sections as they are designed. Take another look at the data sheet, more closely this...
  6. Herschel Peeler

    74HC390 table of pin connections?

    Even simpler. Five fives. One last time.
  7. Herschel Peeler

    Judging white LED brightness.

    Speed is not so much a concern for me, just relative brightness. I found the SFH206K at DigiKey for a buck and small change. Next time I place an order to them I'll get one. I didn't have anything similar in stock. No need for the 100 MHz op amp. An LM358 or such is probably what I'll use. A...
  8. Herschel Peeler

    Judging white LED brightness.

    Super! Shopping.
  9. Herschel Peeler

    Idea for an Ultra cheap Power Supply - will this work?

    Results might vary but I tried it with some 12 V supplies I had and it works.
  10. Herschel Peeler

    View angle -Phototransistor

    "Not stated" kind of implies "isn't consistent". Try it and see if it works.
  11. Herschel Peeler

    Questions resect plastic of electronics

    Yes, plastic decomposes under heavy UV exposure. No resolution is possible,
  12. Herschel Peeler

    74HC390 table of pin connections?

    Divide by 25 reconsidered.
  13. Herschel Peeler

    74HC390 table of pin connections?

    OOPs! After looking at it the Divide by 25 doesn't work. I will have to reconsider that.
  14. Herschel Peeler

    74HC390 table of pin connections?

    See attached pdf.
  15. Herschel Peeler

    Judging white LED brightness.

    Is there a better way to judge LED brightness? I have a black plastic tube about 9 inches long and 8 ,, in diameter (internal) with a CdS cell at one end. I put the other end over the LED and measure the resistance of the CdS cell. My most powerful LED is said to be 220,000 mcd a 100 ,mA. That...
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