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  1. C

    Capacitor 1950 µF

    You can get this for $15.00
  2. C

    Automatic Switcher between 12 volt and AC supply

    Use a 12v really.
  3. C

    Charging/Discharging circuit for multiple 18650 batteries

    18650 cells have to be individually monitored when fast charging. When on say 14-hr rate, they can be charged in parallel an an overall detector used. Just use the $1.00 module for each pair and remove the cells in pairs for charging.
  4. C

    Voltage Drop across NPN BJT C&E?

    I think he probably means C9018.
  5. C

    Voltage Drop across NPN BJT C&E?

    "Repeat this experiment with a 1 kΩ resistor between the collector and Vcc and raise Vcc to 10 V so you can get 10 mA of collector current at saturation. Depending on the "gain" of the transistor, you may be surprised at how low a value of base resistor is needed to drive the collector into...
  6. C

    Voltage Drop across NPN BJT C&E?

    I don't agree with a lot of the things you have said in #1 and in some of the other posts. Some of it is quite incorrect. I am surprised you are saying things like this.
  7. C

    Charging/Discharging circuit for multiple 18650 batteries

    Charge each cell individually with a $1.00 controlling module that operates from USB port. That's $1.00 spent. Put 2 cells in series and use diodes to get 5v. That's another $2.00 spent. Or use a 7.4v to 5v module for $2.00 Put everything in a plastic box. That's another $35.00
  8. C

    Can you help me test a transistor

    You need to put the transistor in a circuit with a 12v car globe (one of the globes for the inside light. ) Put 4k7 on the base and the 12v rail. The lamp will illuminate. If it was a normal transistor, the lamp would not glow. This is a Darlington.
  9. C

    Newbie Project

    The best thing is to use a piezo to detect vibrations from the printer and turn on a 120dB siren for 5 minutes.
  10. C

    Led sequence of 10

    1,2,3,4,5,6,7,8,9,10.
  11. C

    Reading PIC ports

    Here's the subroutine. It's now only 10 lines. Once you get this working, you can add toggle.
  12. C

    Reading PIC ports

    "A jump table is better than either of the methods discussed in this thread." Ok. I will produce a table. table addwf PCL,F ;02h,1 add W to program counter retlw b'00111111' ; "0" -|F|E|D|C|B|A retlw b'00000110' ; "1" -|-|-|-|C|B|-...
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    Reading PIC ports

    Yes, of course, I was not thinking. I was really thinking along the lines that you haven't really achieved much in the test as you still have to go through all the testing eventually. Your method is suitable for large numbers as you halve the possibilities with each test. With mine, each test...
  14. C

    Reading PIC ports

    I am talking about this particular case and the first test. bit 0 will have 0000 0010 0100 0110 1000 1010 1100 1110 that corresponds with the last bit being zero and you haven't done much by just testing for bit zero.
  15. C

    Reading PIC ports

    Each bit has 4 different possibilities in this case.
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    Reading PIC ports

    Main CLRF PORTB movf portA,0 ;put the port value into w movwf tempPort ;put port value into a file MOVLW 0Fh ;to only use the lower nibble ANDWF tempPort,1 ;only lower nibble remains in tempPort...
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    Reading PIC ports

    There are 7 possibilities with xxx0 0000 0010 0100 0110 1000 1100 1110
  18. C

    Reading PIC ports

    Your code requires 7 tests.
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    Reading PIC ports

    NorthGuy. Please don't come in. You don't know what you are talking about. There are 16 results from 4 bits. Bit testing a single bit does not tell you anything as each bit has 4 different possible results.
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    Reading PIC ports

    You have to set up the micro with switches and leds so that you can turn on a LED when a particular switch is closed and turn off the led when the switch is open. When you have done this and it works, you can add the DTMF chip There are 16 results from 4 bits simply take the port value and...
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