RE: Electronics Question

["Keith Doxey" <lists.diyha@xxxxxxx>]

Will work fine but remember that the two halves of the circuit must be powered from different power supplies otherwise you dont have isolation.

 

Keith

-----Original Message-----
From: Stuart Poulton [mailto:swp@xxxxxxx]
Sent: 26 February 2002 14:03
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Electronics Question

Ok, time to ask for more help.

I need to opto isolate serial signal, for reasons which will become
apparent, if I say that the project in question is related to a phone
connection.


So heres what I think I need, remeber serial is only 1200 BPS


           
TTL Signal--------Opto-isolator-------MAX232-------PC Serial Port

Cheers

Stuart





On Sun, 2002-02-24 at 22:21, Ian B wrote:
> Look on my site for a piccy of just that and with 2 wire LCD if wanted.
> Circuit diagram and PCB layout available if you want them (and even in
> Proteus)
>
> Ian
>   -----Original Message-----
>   From: Keith Doxey [mailto:lists.diyha@xxxxxxx]
>   Sent: 24 February 2002 09:23
>   To: ukha_d@xxxxxxx>   Subject: RE: [ukha_d] Electronics Question
>
>
>   The MAX232 I posted to the list yesterday includes voltage doublers and
> converters all in a single 16pin DIP.
>
>   In fact I was building a test board last night with a MAX232 and PIC
> 16F628.
>
>   Keith
>     -----Original Message-----
>     From: Dr John Tankard [mailto:john@xxxxxxx]
>     Sent: 24 February 2002 06:50
>     To: ukha_d@xxxxxxx>     Subject: RE: [ukha_d] Electronics Question
>
>
>     > Hi,
>     >
>     > I'd like to take a data signal clocked at 1200 Baud, from a battery
>     > powered deivce (power is 3x1.5V AAA) for connection to a
>     > serial input at
>     > either 5V or RS232 levels, any suggestions on the best way to do this.
>     >
>     > Note I only need to read the data.
>
>     I assume the question you are asking is how do I get the required
>     voltage to run rs232 ? If that is what you want then you could look at a
>     DC-DC converter, mamim do them from memory
>     http://dbserv.maxim-ic.com/PowerSupplies.cfm
>
>     Or if you don't heed a higher voltage for any other parts of you design
>     you could look at a rs232 driver with voltage conversion built in. Again
>     Maxim do loads of theses but I can't remember the part numbers, take a
>     look on the same site under interface.
>
>     John



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