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Recent content by AnalogKid

  1. AnalogKid

    ac current limiting

    No, you don't. Charging lithium batteries is more complex, and *much* more dangerous, than charging other battery chemistries. Also, charging a string of them in series is not the best way to do things. Variations in aging of individual batteries causes uneven charging, where some batteries...
  2. AnalogKid

    Simple LED Analog Clock Idea

    Only if it is guaranteed that only one LED will be on at any given time. Also, this technique puts a reverse voltage across the off LEDs, Because the circuit voltage is only 5 V, this is not a problem. In a 12 V circuit, the reverse voltage could be great enough to cause reverse breakdown of...
  3. AnalogKid

    Simple LED Analog Clock Idea

    A minor nit. I would go with only one orientation for all resistors. Consider one or two vertical columns of shift registers down the center of the board, and two vertical columns of 30 resistors each outside the shifters; very much like your schematic layout. This will make things easier to...
  4. AnalogKid

    Why can't I breadboard this oscillator?

    In that context - which we know *nothing* about - what is it you are trying to achieve? (both practically and electronically) ak
  5. AnalogKid

    Curved lines in PCB design

    Nigel - it looks to me like everything can be done with a single-sided board; no need for any copper on the component side. Did your post mean to say that the copper pour is on the bottom (typo)? If so, then . . . Leaffraun - Please clarify your question. Are the copper traces on the same...
  6. AnalogKid

    Photo interrupter Connections

    Without knowing the voltages / circuits connected to pins 7, 6, and 2, it's kinda hard to say. ak
  7. AnalogKid

    how do we find the period?

    Because that is the length of one cycle. If a waveform or chart has a repeating pattern, and each pattern is the same, then the period is the time from the beginning to the end of one pattern. That is the agreed upon definition, and has been in place for way over a century. In electronics, a...
  8. AnalogKid

    how do we find the period?

    If the waveform is a constant frequency, then the period is the inverse of that frequency. The period is the time between two identical points in the waveform, one cycle apart. For example, the time from one rising edge (such as at -5) to the next rising edge (at -1) is the period. ak
  9. AnalogKid

    Op Amp not working and overheat

    The negative end of the 1 V DC input must be grounded. Note that when the circuit is working, it will not be able to operate at a gain of 10 because that would mean a 10 V output with only a 5 V rail. ak
  10. AnalogKid

    help please

    So, back to the original question - what are the power supply output voltages and currents you want? ak
  11. AnalogKid

    help please

    What do you mean by "CD"?
  12. AnalogKid

    help please

    The video you linked has links to other construction pages. The first one has schematics for a power supply that makes +/-20 V unregulated, and +/-10 V regulated. If you are building the same project, why do you need +/-12 V and +/-15 V? ak
  13. AnalogKid

    help please

    Both what? You need to be much more specific about what you want, because we do not know your application / system / whatever. Input voltages Output voltages Minimum and maximum output currents *per voltage* Temperature range - max heatsink sizes - are fans allowed - enclosed or open-air -...
  14. AnalogKid

    help please

    Without a more detailed review, the schematic looks fine at this point for +/-12 V outputs. The outputs can not be adjusted up to 15 V. What is your question? What addition do you want to make? Do you want to add 15 V and 5 V outputs to this supply? Also, what is the source of the...
  15. AnalogKid

    LED circuit for 1/6 scale diorama

    The problem with #32 and other posts is that Light and Ridiculous should stay on continuously once illuminated. One way to do this is to use a shift register instead of a counter, with the third output enabling an oscillator for Ludicrous. Fun fact: the CD4017 used in several posts is actually...
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