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Thanks for your valuable reply. I want to use some mic that does not require any supply. I want mic inside only of a traditional P.A microphone. Is this available on market and what kind of mic it is?
Why Connecting Electret mic to a P.A amplifier not working. What kind of microphone will work with P.A systems ?. I am making a P.A system based intercom.
I tried max485 on 9600, but if connected more than 5, started receive failure on some MCUs. So to avoid complexity, I switch to pulse mode experiment, which can reduces complexity, cost and current consumption. Working so far fine on 300mr.
One disadvantage of daisy chain method is, if one node failed, entire will fail after it. So I am thinking of putting a foreward diode too between incoming pin to outgoing pin, so that even if one intermediate mcu failed, it will not affect the others after. I see a clash chance on failure.
I am working on an existing public address infrastructure in an school. I have already done wiring, CAT6 in addition to the traditional 100V line matching speaker lines. Some 80 speakers are there in 4 independent groups. ie 20 to 25 in a line, having a length below 200mtrs.
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Thank you very much for your valuable suggestion. But I am confused with UART will reliably work over some 200mtrs and for some 25 MCU slaves simultaneously. Any way, I will try it and reply on some ultra low baud rate.
Thanks for your prompt reply.
I just tested now with a point to point 300mtrs long cat6 cable, works fine while applying a toggling pulse every 1ms for speaker 1, 2ms for speaker 2 and a 100ms for 100th speaker and vise versa. Have to connect and test with more
Low noise environment
No idea on...
Addressable speaker system 1 wire long distance PWM like communication
Hello Folks,
I am working on an addressable speaker system project on which some 25 speakers are connected, each with a PIC MCU inside and want to select one at a time. CAT6(8 wires) cables are connected. two pair for power...
Dear dick_freebird, I tried both Industrial grade (80 degree) and Extended (125 degree). And was monitored for weeks, and think it is not a heat related problem.
Thank you very much for your kind suggestion Klaus.
Got a filter circuit from another thread https://www.edaboard.com/threads/341214/
https://obrazki.elektroda.pl/2437872500_1437359410.png
and a buck converter circuit with protection diode from https://www.edaboard.com/threads/256116/
I...
Dear friends,
I am developing an In Car security system using PIC16F886 but facing random failure
I am new to automotive design and I am using a traditional 7805 regulator to power up a PIC16F886 mcu and some sensors.
Everything works fine but after running few days, randomly crashes the...
I have developed an on-line vehicle tracking system using SIM900. Everything works fine in local network, but while roaming, SIM900 always shows (AT+CREG:2) ,searching for a network. On a mobile phone the same sim card works fine on roaming. I also tried on the latest SIM800 module, that also...
I am using a ready made board based on XL6009 to convert 12V to 19V. Just make a google search for it
https://www.google.co.in/search?q=xl6009&rlz=1C1LENN_enIN516IN516&oq=xl6009&aqs=chrome..69i57j69i59l2.4487j0j7&sourceid=chrome&es_sm=93&ie=UTF-8
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