1. K

    Clock edge detector using capacitor and resistor problem

    I have watched recently this video: At the end of it he describe a way to make edge detector by using capacitor and resistor. The thing is i don't see it being discharged in any way. Would't it make it impossible to charge again and in consequence make current flow through the resistor and make...
  2. MrsssSu

    Can this relay handle 2 circuit?

    Hi all, :) I found a relay datasheet at here. Just Wondering, can this relay handle 2 seperate circuit or just 1 circuit as highlighted in my diagram below?. Thank you :)
  3. MrsssSu

    Delay On and Delay Off

    Hi all :), The circuit on the left is a delay off circuit using NE 555 whereas The circuit on the right is delay on circuit. For hobby purpose, lets consider this scenerio. When light is off, the led will turn off after a 3 seconds delay whereas when the light is turn back on, the led will turn...
  4. MrsssSu

    Delay Timer using NE 555 circuit

    Hi all, :) I am trying to simulate a circuit at https://elonics.org/adjustable-auto-on-off-delay-timer-circuit-using-555/ for delay timer in NE 555. I have replaced the switch with a mosfet, however I don't get the correct output :). I have attached my LT Spice file below. I am not sure what I...
  5. MrsssSu

    Measure Earth Magnetic Field using Hall Effect

    Hi all :), This is about Hall Effect from here. The voltage across a metal will change based on the strength of the magnetic field. I am wondering whether this will be accurate in reading small magnetic field such as the earth's magnetic field to point to the NORTH. From my knowledge, since the...
  6. MrsssSu

    TL 431a voltage regulator circuit

    Hi all, below is a TL 431a voltage regulator circuit. Just out of curiosity, what can I do to replace TL 431a with its internal discrete components circuit so that I can better understand how a voltage regulator works :) I have posted my LT Spice file below so that you can unzip and simulate it :)
  7. MrsssSu

    Beautiful rain drop lights using discrete components.

    Hi all, I saw this chip at here which is able to make beautiful rain drop lights and searched for the datasheet here for its internal circuits. I have searched the web that can do the beautiful rain drop lights using discrete components but could not find any. Does anyone know how to do the rain...
  8. MrsssSu

    Stepper Motor not get enough power

    Dear readers, I followed this code at here and built its circuit. However, the stepper motor does not get enough power or even torque or speed so that when I can stop the wheels easily by slightly touching them? Are there any solutions for this? I have checked that my battery are all...
  9. MrsssSu

    Discrete Half-bridge driver

    Hi readers:), I found datasheet for HALF-BRIDGE DRIVER IC here . I was hoping to find the IC discrete components circuit from which it was built upon using transistors, diodes, resistor only but its not in the datasheet. I tried to search the web for it but it offers H-bridge with negative and...
  10. MrsssSu

    LM 393 discrete components circuit

    Hi all, I saw this article at here . I tried to simulate it in LT Spice, however, not an expected output. What mistake have I made? . I have attached my LT Spice below for amendment. Thank you for reading and have a nice day :)
  11. MrsssSu

    H-bridge using IR2184 chip.

    Hi all, I want to implement a H-bridge driver circuit. May I know how to make some changes to the circuit above so that it forms a full-H-bridge using transistors. I attached my LT Spice file below :) Thank you for reading.
  12. MrsssSu

    Generate triangle wave with phase shift from square wave

    Hi all, I am trying to simulate the circuit above in LT Spice but the output is not the same . It can be found here . What mistake have I made :) ? I have attached my LT Spice zip in the folder below for easy amendment. Thank you
  13. MrsssSu

    Led dim to bright then bright to dim in a flip flop ne 555

    Hi all, above picture is a ne 555 flip flop circuit (1 off, 1 on) and vice versa. Lets say the red led receives an input (1) that is a constant dc voltage, how do I make the red led to go from dim to bright and then from bright to dim and vice versa with the blue led? Are there any schematic...
  14. A

    Output of OP-Amp circuits

    Could really use some help with this, thank you all :)
  15. MrsssSu

    How to fix this circuit (IR 2184) ?

    Hi all, I refer to this website at here . This circuit should give a complementary square waveform (R1 square wave & R2 inverted square wave). However, I did get a good square wave across R2 but R1 did not get any square wave. Does anyone know how to fix this? I have attached my LT spice below...
  16. MrsssSu

    IR2184 gate driver LT spice file

    Hi all, can anyone share IR2184 gate driver LT spice file with me that can be downloaded ? Thank you:)
  17. MrsssSu

    Half-Bridge Inverter (IR2184) chip connection

    Hi all, I bought this IR 2184 which is used in half-bridge inverter. Will the peak voltage of PWM of GS of mosfet as shown in green will be according to Vcc which means in this case, if I use a Vcc (12V) and PWM of 8V peak (IN), it will output a 12V peak square wave at GS of both mosfet? And...
  18. G

    Replacing Tactile Switch

    Hi, I need help determining which switches to use to replace the ones that are intermittent on the controls for my electric blanket. I believe it's this one, based on how it looks, but I don't know whether or how to determine if it's 24v or 12v. The switches don't always work when pressed...
  19. MrsssSu

    Small pull-down resistor for mosfet (fast switching, high capacitance)

    Hi readers, When I used this IRF 3205 which has high capacitance between the Gate-Source of the mosfet, whenever I add a lower pull-down resistor, the switching becomes faster and faster (visible nice square wave). For my case, for IRF 3205 to fast switching at 20kHz (nice square wave), it would...
  20. MrsssSu

    PS2501 optocoupler LT Spice Library File

    Hi, is there anyone having this PS 2501 optocoupler library from LT Spice. Pardon Me, I couldn't find on the internet :). Please attach it below. Thank you