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Recent content by arjob

  1. A

    8051 port1 current problem

    The pins in Port 1 has internal pull-ups when used for input. The Mosfet is off and the drain is pulled high using an internal pull-up resister. I connect and ammeter and see that the current (IL current) flowing to ground is about 15uA. I inferred that the value of the internal pull-up...
  2. A

    Why is base current not what it should be?

    Yes, thanks. I realized the mistake I was doing in calculating the Ib.
  3. A

    how to analyse a darlington pair?

    Thank you. Yes i realized that now.
  4. A

    Why is base current not what it should be?

    My multimeter shows: Ib=218\[\mu\]A why? But my calculation shows, it should be: 8.5\[\mu\]A I used the formula: Ib=(3.1-0.7)/(10k+271k) [I have \[\beta\] = 270 ] What is the problem? Please help
  5. A

    how to analyse a darlington pair?

    Is the LEFT circuit of darlington pair, equivallent to the RIGHT transistor circuit? Is my asumption true? I replaced the two transistors in darlington pair with one; having beta equal to the product of betas of the two transistors, and the voltage from of 1.4 (0.7+0.7) across Base and...
  6. A

    Open circuit voltage is not what I expected.

    Thank you so so much.. Should a more expensive multimeter solve the issue?
  7. A

    Open circuit voltage is not what I expected.

    I did this circuit in real and found that that the voltmeter is not showing want I expect. I tough the voltmeter should be showing 5.1 volts. Why is it showing 4.6 volts? Note: I am using a digital multimeter. And I tried with a 3.3 v battery, then I am getting 2.8 v.
  8. A

    at89s51 programmer for laptop

    I can get USB to RS232 cable. Will it work? Is there any good serial programmer schematic?
  9. A

    at89s51 programmer for laptop

    I guess, I will buy a USB programmer..Oh I so wanted to build the programmer myself. :( Thanks.
  10. A

    at89s51 programmer for laptop

    I an a newbie so please tell me how to program At89s51 chip using ISP. I will use laptop and so I do not have parallel port. I have searched a lot on the Internet , but either I got a 404 or it uses a DB25. Will a USB-DB25 converter cable will work? Thanks
  11. A

    [SOLVED] IC Input and Output Currents

    thanks so much. you made it clear enough!
  12. A

    [SOLVED] IC Input and Output Currents

    Hello guys, I am new to electronics. While i was experimenting with 74LS series ICs, I saw the peculiarity, that the I/O current does not match the specifications for the IC. For example the 74LS00 IC specification says, that its Output High current is -400 micrcoA, But I am getting close to 170...
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