resistance

Hi all:), I have been trying to find circuits to make my own DIY walkie-talkie. Referring to video at here, the Jumper wires(yellow), is it just a wire connection from 1 to 2 ? If so, why need Jumper? Does this circuit works by converting our audible frequency sound to higher frequency sound...

Dear readers, if I want to reset an NE555 timer (by pushing a button within a time frame) at the point where the output signal is at the end of the high voltage as highlighted in the diagram. How can I accomplish this? Thank you for reading and have a nice weekend:)

Dear all, I am looking for a circuit that can on an led by pressing the same button for 3 times? Thank you for reading and have a nice day:)

Above is related from here but this ic only allows the led to be on at the same time interval. Is there a circuit which can help to activate 3 led consecutively for different time intervals. For example, led 1 will on for 3s (the other 2 led will be off), followed by led 2 will be on for 2s (the...

Hi all, does anyone have the 74HCT.lib with the square symbol of 74HCT.lib :)? Do you mind sharing it because I am having a hard time googling the one with a square symbol as shown above? Thank you and appreciate it :)

Both pictures are quoted from here and here. I am trying to simulate it in LT Spice using Logic gates as the Level Triggered D Type Flip-flop and this circuit converts f to f/2 that is halving the input frequency. However, I got the error timestep is too small in LT Spice. May I know how to...

Above is quoted from here. This circuit produces beautiful rain drop led. May I know how do I actually increase the deadtime which means all led are off for a longer period for all the 4 led as shown above? My LT Spice file is below. Thank you :)

The above is quoted from here and I have build the circuit in LT Spice for simulation. The output (highlighted in pink) is as expected that is complementary PWM. However, the question is how do I actually position the wave so that it has same amount of dead time between both waves because it...

This LT Spice circuit is recreated from the IR2184 datasheet on how to make a complementary PWM signal with dead time. However, the problem I am facing now is the PWM fed into the 2 mosfets as shown in the diagram above, the dead time between the 2 signals does not increase even if I increase...

Hi all, I purchased a AM FM Radio Receiver DIY kit CF210SP and the tutorial is here. The problem I am facing now is handling the small ic cd 9088, which is too tiny for me to handle haha. So, I am searching for a bigger version of cd9088 that can be mounted on a breadboard for convenience, but...

I have a garage door and the controller board had a few dead components that i replaced, but the only one part is difficult to find bc it's dead and i cant measure it, is this a "10 kOhm 1W" resistor or a "10 Ohm 1W" or is it a really different one?.

Hi people, It has been quite a long time since I posted anything lately :) Refering to the XOR gate schematic and truth table above from here, I have designed them in LT Spice. Higlighted in green are the 2 inputs and purple is output.However, to my surprise, when A and B are both true (A=5V ...

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 :)

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...

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...

The water tank level indicator display has broken in my van. There are four resistor-based sensors in the tank and I'd like to replace the display with an lcd or led type designed for batteries. Powering from the 12V nominal lead-acid or LiFePo4 battery (it needs to work for either) in the van I...

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 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 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.

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