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I tried a IC LM7805 LDO but It still noise from 24V SMPS
1712115495
I have oscilloscope to catch noise. My issue is if I replace normal SMPS 24V by meanwell 24V then It is work . How to filter noise from normal SMPS 24V ?
No I mean that if I use a pulse power supply 220VA-24VDC via a buck circuit using LM2576 to 5V output then It is noised
This is buck circuit i used
And this power supply that cause noise
1711900010
For * electrical supply voltage ripple . This noise . Do you have solution for this
Hi Everyone,
I got issue with SRF05 distance measurment module . If I use batterry supply then the module measured distance correct but If I use a pulse power ( 220VAC => 24VDC ) then the module got noise and can't get correct distance
Maybe power supply is noise lead to IC OPAM LM324 is not...
So what is capacitor value that you used for LM2576 ?
Do you think about switching power supply ? This power supply often have noise . is It ok if around environment have motor electric device. Does it impact ?
Sorry I corrected again schematic
1665308867
It happen spontaneously in operation . The length bus is about 70-80m.
Why is the component is destroy when without overvoltage protection because VCC for 485 IC is 5V ?
The Switch power supply often have current leakage and sock when touch in...
Hi All,
I have a RS485 network with 32 nodes
This is my circuit
This issue here is My board some days is burn some component on board
I use switching power supply like this to supply 24V for all nodes on bus
And Here is picture components is burned
on The bus have 32 nodes but just have...
I update schmatic again
1663209753
is It okay with 9600bps speed and multi node on bus ?
1663209756
is It okay with 9600bps speed and multi node on bus ?
Hi all,
This is circuit for 485 auto direction
Everyone can explain why it worked ?
When a bit of TX signal is low level then DE,RE pin is at low. It will disable transmit and at receive mode. Is this circuit work ?
If this circuit work well then can It apply for about 32 node ?
Is Best...
You are wrong my mean . I mean that I want to control direct from STC11 ( above schematic ) . As SRF04 or other ultrasonic module , It is using a microcontoller that programmed. Thus I want to know how to that microcontroller work. As above schemtic , Why does It use 3 pin P5.1 and P5.2 instead...
Hi all,
This is circuit for module SRF04
Why do The everyone know 2 pin P5.1 , P5.2 from STC11 connect to Max232. The STC11 will generate 40Khz on P51 , P5.2 both to ultrasonic 40T ?. If only using a pin of ultrasonic 40T and left pin connect then is it ok ?
How to code for STC11 or...
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