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hi to all for usefull discution.
in this discsstion i undersand some points. which i going to use.
1- its better to use CC digit rather then CA.
2- for driving CC digit to i going to use NPN transistor (BD139)
3- remove collector resistence and use 500R (470R) on each segment for 20mA and 2Vf ...
hi, all i need some suggestion about 7 segment display. i make circuit its work fine but for some time its start dim some segment and in the end its damege.
i share schmetic diagram diagram i operate with arduino.
i use 10k resistence on pnp transistr base and 10R on digit comman point.
hi,
1- use power tracks wide for minimize voltage drops
2- use separate path route of power track and CPU track, from regulator or power source.
i learn these points from you, thank,
and yes i always use revers diode parallel on coil load , and use 100uf capacitor parallel on...
Hi, I'm really thankful for your guidance. I truly consider your advice, but unfortunately, I did not apply it to this PCB. I will keep it in mind for the next time. I just need tips for future circuit designing:
Use FETs over optocouplers because they are more reliable for the long term and...
yes i know , its low stander design , i have some limitation , i draw only one side pcb bcz of local manufacture not able to print double side, and i use module bcz of easy solution, i have one question , i have 2 gournd one is for outside of controller and one is innternal controller, so i...
Hi, I appreciate your answer. You are right about everything. The optocoupler is not reliable for a long time. On my side, I have no issue with the price, and it's not for a highly sensitive machine. My concern is only electromagnetic noise.
So, this time I found the problem. It's the 5V relay...
Thank you for guiding me.
I use an optocoupler for every digital input and output. The reason is to isolate the main controller board from the external circuit.
Basically, my controller card reads and controls a machine that has a magnetic conductor and an AC induction motor. Everything is...
Yes, I tried to isolate the ground with the microcontroller, but for the ADC, I must use the same GND. This is a confusing issue, and I don't have a solution for this.
Earlier, I used an SSR module which had a BJT transistor but it didn't work with a 3.3V signal. That's why I used an...
-> 24V supply: An external supply is used, which is the supply of another discrete IC card where I obtain analog signals. Earlier, I operated the main controller board using this 24V supply, but now I'm using the HLKPM01 220 to 5V module.
-> I'm trying to isolate the controller and digital...
Hi,
Yes, I understand what you're saying. Thanks for guiding me. I've redrawn the complete circuit. First, I'll post the schematic, and then I'll start PCB routing.
I've redrawn everything for practice and learning. Kindly take a look at my schematic and guide me regarding EMI noise and how to...
Hi kalus thanks to replay.
U said solid plane. For this u mean plane top copper side. ?
I make one side pcb that is why i draw pour on bottom side and connect to external ground.
Proper bypass
And
EM compliant circuit desing
kindly guide me for this.
I have not much experience in professional...
Hi,
I try to drive electromagnetic contactor with esp32 controller and display some data on JHD 2x16 i2c (pcf8574)lcd. An d 2 button for some function.
For this i schematic and made pcb.
But issue is that when electromagnetic contactor on or off . My circuit is disturb.moslty lcd start showing...
i m in testion phase and my load current is 1 amp , when i use high current load then i use havy track and wire.
problem is fet getting hot on samll amount of current and behave different in both direction with same freq and pwm.
i think my bootstrap cap value is wrong.
what is the best value...
i m using this circuit and trying to Drive DC motor , i generate 61 Khz PWM frequency for speed controlling . bootstrap capacitor i use is 1uf.
but when motor ran farword speed change but in above 50% pwm circuit short, when run revers no shortage but speed not vari , and on 1 ampare load...
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