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  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

    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...
  3. Herschel Peeler

    Modified meter lead for breadboards.

    I often have need for more than one meter on breadboard projects. I modify the leads with pins that fit smoothly into the breadboard. Jameco part number 185421. Cost about $0.07 each purchased in quantity of 10. Crimp, solder and heat shrink. Favorite meter currently is from Electronic Goldmine...
  4. Herschel Peeler

    Voltage on a white LED.

    Just because the data sheet says 3.5 V at 20 mA it does not mean it must be used that way. Here is an exercise riving a white LED at different currents. Above is the schematic used. I started at the low end and increased current until the LED lit up. To my surprise the LED was almost always lit...
  5. Herschel Peeler

    List of CMOS digital devices, CD4xxx

    Included are devices in the 74xx family greater than 6000. .
  6. Herschel Peeler

    List of older 74xx devices

    This is an older list (2014). Let me know if I missed anything. 74xx devices greater than 6000 are in the CMOS (CD4xxx) devices list posted elsewhere.
  7. Herschel Peeler

    Presettable counters

    Presettable counters let you set a starting count. You can restart at that count by monitoring the outputs of the counter and feeding it back to the Load* input, as on the 7416x family. Data sheets will often, not always, include application examples.
  8. Herschel Peeler

    JFETs as a current source and a question.

    Getting to play with Junction FETs, discovering them as a current source. I had three on hand; 2N3819 N-JFET, PN5433 N-JFET and 2N5462 P-JET. I did the attached exercises in the configurations shown in the schematic. Each exercise means building it with all resistors, 10 ohm to 1 M ohm and...
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