Discussion in "Hardware" started by    tutu10    Mar 12, 2019.
Tue Mar 12 2019, 07:13 AM
#1
Hi...

My firmware upgradable code lock seems to be ready soon :shock:
Now i use PowerPCB to build the circuit. Before that i want to ask something...

EMC is pretty nasty phenomena, which usally is forgotten when design e.g. MCU-based appliction. I had some really weird problems caused by EMI.

I found this Atmel's AppNote 042, which suggest following aids to decrease EMI. I just have problems of finding proper coil of 47nH. Can i replace it (L1) with 100nH coil? Still i wonder is L1 and C3 somekind of LC-circuit? Thus changin value of L1, may significantly decrease LC-filter efficiency or may reduce transient current too much. Shoul'd C3 value then recalculated? Am i right?
Wed Mar 13 2019, 02:32 AM
#2
Hi
I looked at
" Atmel AVR042: AVR Design Considerations " but did not
see the values you asked about.
In general ,I don't think the filter values are critical and so a 100nH coil should be okay
without changing other values.



[ Edited Wed Mar 13 2019, 07:26 AM ]

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Wed Apr 24 2019, 12:30 AM
Kenneth Evans
Kind Regards,
ExperimenterUK
Sun Apr 14 2019, 10:52 PM
@hassan malik post your problem in the "General help Guidance and Discussion" forum
Sun Apr 14 2019, 05:06 PM
RAJESH MAPARi
please send me code to interface atmega32 with 24c1024 serial eeprom
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hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.please any one help me
Sun Apr 14 2019, 01:32 PM
hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.
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Sat Apr 06 2019, 05:59 PM
@deshrar. Please post your question in 8051 forum
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deshraj
hallo mam.. i have downloded gsm notice board code its running fine on lcd but how so send msg to the module . i mean format of password and msg.. thank you
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Can i see the circuit diagram for the music tone library 8051 project?
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@Prudhvi. Please post your request in 8051 forum
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Prudhvi reddy
Can you please help me writing code for gsm to send a particular SMS after pressing a key in 4×4 keypad ..in 8051

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