transistor

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...

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...

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 :)

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

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...

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

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...

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...

Is the second pole in the node marked in red? I am not sure

Dear readers, Above is taken from here . Can anyone recommend transistor Q1 (npn) and Q2 (pnp) to me for driving a mosfet at a 100kHz or higher. What are some of the common best fast switching Q1 and Q2 that can handle high current and high frequency PWM at its base ? Thank you :)

Dear Readers, I got this PS2501 optocoupler datasheet at here. In the image shown, the rise time and fall time is microseconds and I am afraid it's not suited for my needs as it will produce some switching losses in H-bridge circuit running at 100kHz minimum. Are there any very-high speed...

Hi readers, :) I found this at Click here This is an example of a disconnect and reconnect circuit using NE555. This means that the state of load will be (High, then, Low, them High). However, when I simulated using LT Spice it just give me (Low and High only). Does anyone know how to make the...

Hi People :), The reason why I will be needing an oscillating dc waveform is because I need it to be fed into the input of a comparator to produce high frequency square wave dc signal. I built this Wein Bridge Oscillator and it works fine to produce quite a high frequency sine wave. However, I...

Hello, I was hoping to get some help/advice on a personal project I'm working on that requires quite a bit more electronic hardware involvement than I'm used to. I can manage code, computers, microcontrollers etc fine but I'm not very well educated in general electronic hardware at all besides...

I have a similar question to click here. However, in my case i am using ne 555 for logic gate inverter :). I have generated the complementary PWM and it works totally fine. My question is how to add a dead time between the pulses. From click here, people suggests to use an RC network, how do I...

Hi People:), I am trying to build a synchronous step-down converter but my LT spice simulation shows poor efficiency. The picture above is at Here . I have attached my LT spice below for reference. May I know if this is the right way or anyone can correct my LT spice file and send it in the...

Lithium ion cell are charged at 5V and 2A max. Following Ohm's Law, 5V/2A would mean at least a 2.5 Ohm internal resistance of battery. However, Lithium ion internal resistance is only about 0.28 Ohms. How is that possible :)?

I'm trying to make a biphasic functional electrical stimulator using the circuits in this paper. But I modified it by using MPSA BJT transistors instead of MOSFET. I'm in the middle of developing a Multisim simulation for it. The boost converter worked fine and could climb up/down to around +-40...

Hi People :), This is a step up dc to dc converter. This schematic inputs a 15V and outputs a 22V DC. However, I want the input range to be between 3V to 50V and all gives the same constant 22V DC output current. How can this be done with UC 3845. I have attached the schematics below and spice...

Hi readers:), Click here . This link refers to making a lithium-ion battery charger using a BC 547. Question: How efficient is this circuit in (%) that is useful output power/ input power to charge a battery? I am planning to build a 4.2V charger but with a much higher ampere limit by...