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  1. gorgon

    PWM Online Battery Charger

    You don't need anything extra between the power and the battery, IF the charger don't load the battery when turned off. If so use the diode in Electrobrains schematic. Another thing is that you should disconnect the load from the battery if it goes below 10.5V loaded. If not you may ruin the...
  2. gorgon

    PWM Online Battery Charger

    As long as the power don't output more than 13.8V, AND depending on the ambient temperature, you could use the power directly as a trickle charger for a lead acid battery. Personally I would be more happy with 13.6V, but it all depends on the ambient temperature. The higher the temperature, the...
  3. gorgon

    i want to learn to code but.....

    And, as far as I remember, it was released on april 1st. :D TOK ;)
  4. gorgon

    i want to learn to code but.....

    Offer them to sign a NDA, at least if you represent some type of company. I've had to do that some times, to get detailed data. Such limitations on product data does not increase the number of users of that chip, since you as a designer is responsible to get approvals on the end product...
  5. gorgon

    Help with a logic LED testing circuit 4049 IC question.

    Yes, I've edited my response. There are small differencies from brand to brand, I've seen limits as low as 13V on some. Still, the logic levels will still be inside the Vdd envelope as normal, with a switching point around Vdd/2. TOK ;)
  6. gorgon

    i want to learn to code but.....

    There is a difference between a datasheet and what is called a 'reference manual' on a more complex part. Today many companies combine the two and leave out a lot of information needed for the programmer. If it is included, it is put into a complete different chapter than the one it should be...
  7. gorgon

    i want to learn to code but.....

    After programming assembler on a number of different MCU families for over 30 years, I've added C to the list for microcontroller programming the last 3-4 years. The one thing I've found during this time is that the problem is mostly never related to the program language, but the bloody IDE each...
  8. gorgon

    Switch Types

    If I understand you correct this is to activate something inside the coaches? How about something as simple as a magnet on the outside, activating 2 reed switches, one after the other. The direction of the activation will determine the sequence. Connect each reed switch to the 'set' and 'reset'...
  9. gorgon

    Help with a logic LED testing circuit 4049 IC question.

    OK, I yield and 'remove' my comment after looking through a number of different datasheets. @Steve: You are correct in your comment. However since I found the voltage limitation in a datasheet last night, there may be differences between the brands, and any such use should be done after...
  10. gorgon

    Low drop out voltage regulator.

    You don't say anything about your charging current or the max voltage input range. The efficiency you have is also not listed. I stipulated the following: Vinmax = 12V Vinmin = 3V Vout =5V Ioutmax = 1A Just for fun I put this into webench designer from TI/NS and came out with the...
  11. gorgon

    Can anyone identify these capacitors?

    From what I've seen before the value is based on uF, not pF in this case. 331 is 330uF TOK ;)
  12. gorgon

    Need help understanding V drops and Current

    Thats a rotten power supply you have there. A normal 12V power supply rated for 300mA, will supply 12V up to a load of 300mA. What happens if you draw more than 300mA is another history. The output voltage may fall, so the max current is kept to something above 300mA. (There will normally be...
  13. gorgon

    Relay Keeps Sticking Randomly

    We are then down to what do you switch with these relays, and how do you get 18V from a 9V battery. A schematic would clear some fog, I hope. :D TOK ;)
  14. gorgon

    simple question

    4.7uF is a standard value, and you don't want to use a capacitor up to its max voltage. I would never go further than 80% of the voltage on a regular basis. You should also know that most elecrolytic capacitors has low accuracy, and may have 10-20% more 'uF' than the marked value. So if you...
  15. gorgon

    Synchronous Counter Circuit with "mystery output."

    You should put a capacitor of some uF, like 47-100uF on the 5V supply entry, and a 100nF over each chip's supply pins. The 7805 regulator need a capacitor on the output, and the large capacitor will serve as a reservoir for powerspikes from the LSTTL chips. The 100nF will remove the high...
  16. gorgon

    Ignatron triggering Circuit: Troublesome NPN Transistor

    I wonder what 'high' speed means here? To get real high speed you should get rid of the pullup resistor, and add a transistor to pull up too. How about a proper buffer (inverter) from some high speed logic family? TOK ;)
  17. gorgon

    Relay Keeps Sticking Randomly

    The only relay I could think of that could fit into this description, at lest partially is reed relays. But they are not made for power applications, so the point is moot. TOK ;)
  18. gorgon

    USB converter B type female to A type female

    1.a) Ohm and verify contact between all terminals on A and B connector. A hairline fracture is not easy to see. TOK ;)
  19. gorgon

    help in programming long press button

    Just a couple of comments on this, based on what is discussed. Generally it's a bad idea to do large globs of code inside an ISR. If you want a timer, just increment a tick counter inside the ISR, and do the processing outside. If the timer interrupt is very fast, you could make a precounter...
  20. gorgon

    Synchronous Counter Circuit with "mystery output."

    Why don't you use the last half 74ls76 to clean your clock. I suspect that the 3 clocks does not act equal to the circuit, or the clock input itself is glitching, making more than one puls each time. If you collect all clocks through the last jk-flipflop, it should be better. Decoupling and a...
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