Digital Circuit Design

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Digital circuit and logic questions (ie. Logic, Gates, I2C, USB, 555 Timer, etc.)

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Page 1 of 51
  1. Kelvin Lee

    Adding resistor to protect the MCU

    Kelvin Lee, Nov 10, 2018
    Last message by R!f@@ Nov 18, 2018 at 11:53 AM
    Replies:
    30
    Views:
    302
  2. Zorac

    Door sensors randomly triggering on a Raspberry Pi

    Zorac, Apr 7, 2018
    Last message by Zorac Nov 17, 2018 at 6:43 PM
    Replies:
    17
    Views:
    1,206
  3. AmirRashedi

    Driving Unknown 64x128 Monochrome LCD

    AmirRashedi, Nov 16, 2018 at 7:39 AM
    Last message by atferrari Nov 17, 2018 at 9:37 AM
    Replies:
    3
    Views:
    145
  4. MrMule

    Simplest way to replace a variable resistor with a digital equivalent

    MrMule, Nov 16, 2018 at 7:57 AM
    Last message by Alec_t Nov 16, 2018 at 10:05 AM
    Replies:
    7
    Views:
    107
  5. Buzzer25

    Variable Timer for relay switching

    Buzzer25, Nov 15, 2018 at 6:29 AM
    Last message by Buzzer25 Nov 16, 2018 at 2:56 AM
    Replies:
    9
    Views:
    125
  6. sc0tch

    Schmitt Trigger to clean square wave

    sc0tch, Nov 14, 2018 at 3:09 AM
    Last message by crutschow Nov 16, 2018 at 12:15 AM
    Replies:
    14
    Views:
    225
  7. Kelvin Lee

    How to wire a 3 pins IR receiver with NPN/PNP transistor

    Kelvin Lee, Oct 24, 2018
    Last message by ebp Nov 16, 2018 at 12:12 AM
    Replies:
    32
    Views:
    642
  8. jack2001

    Not Enough Time to Close the Circuit by Relay. How to address that?

    jack2001, Nov 15, 2018 at 1:42 PM
    Last message by jack2001 Nov 15, 2018 at 2:32 PM
    Replies:
    5
    Views:
    80
  9. kelumsd

    Dual D-Type Flip Flops of 74ALS74 and 74LS74

    kelumsd, Nov 14, 2018 at 11:53 PM
    Last message by MrChips Nov 15, 2018 at 11:41 AM
    Replies:
    9
    Views:
    147
  10. sc0tch

    Parallel to Serial on Loop

    sc0tch, Nov 11, 2018
    Last message by sc0tch Nov 12, 2018 at 9:19 PM
    Replies:
    11
    Views:
    198
  11. BWBW

    NPN and PNP with Comparator

    BWBW, Nov 9, 2018
    Last message by ebeowulf17 Nov 12, 2018 at 7:34 PM
    Replies:
    7
    Views:
    189
  12. Lime4

    Common Mode Rejection Ratio

    Lime4, Nov 11, 2018
    Last message by danadak Nov 12, 2018 at 6:25 AM
    Replies:
    3
    Views:
    77
  13. raja2n

    Water leak detection using sensing cable

    raja2n, Nov 5, 2018
    Last message by sc0tch Nov 11, 2018
    Replies:
    10
    Views:
    207
  14. bug13

    555 timer latch on when trigger hold low

    bug13, Nov 8, 2018
    Last message by bug13 Nov 9, 2018
    Replies:
    11
    Views:
    198
  15. Sheik Abdul Rahman S

    Convert Active low signal to Active high signal 3 to 5v

    Sheik Abdul Rahman S, Nov 9, 2018
    Last message by AlbertHall Nov 9, 2018
    Replies:
    4
    Views:
    128
  16. jfour

    ESD Foot Strap Test Circuit design

    jfour, Oct 12, 2017
    Last message by jbeng Nov 8, 2018
    Replies:
    10
    Views:
    574
  17. danadak

    Stable Clocks ESP8266 Nodemcu

    danadak, Nov 8, 2018
    Last message by danadak Nov 8, 2018
    Replies:
    0
    Views:
    59
  18. georgedb

    4040 and 2716 EPROM; is this the way to set it up?

    georgedb, Oct 23, 2018
    Last message by georgedb Nov 8, 2018
    Replies:
    41
    Views:
    569
  19. z7d8tsg87oh2g92h9p38fh

    Need Help Converting 150,000hz 3.3V 19.38mA DC Square Wave into 20Volt .2A A.C Square Wave

    z7d8tsg87oh2g92h9p38fh, Oct 26, 2018
    Last message by z7d8tsg87oh2g92h9p38fh Nov 7, 2018
    Replies:
    17
    Views:
    372
  20. Vipul Kumar 1

    Electret Condenser Microphone Preamp

    Vipul Kumar 1, Nov 4, 2018
    Last message by Alec_t Nov 6, 2018
    Replies:
    5
    Views:
    135
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