alternatives of max232 in low budget projects - do it easy with scienceprog
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8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
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1/9/2014 Alternatives of MAX232 in low budget projects - Do It Easy With ScienceProg
http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/ 1/12
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Ease H-Bridge on MOSFET IRF7105
transistors
AVR-DDS signal generator in-line ASM
explained
Alternatives of MAX232in low budget projects By ScienceProg| 6 December, 2006 | Free Hobby Electronics Circuits
Sometimes when you work on low
budget projects of dont want to go
shopping for max232 or similar IC you
can save your time and money by using
other TTL to RS232 converter. We
usually used to use MAX232 chip likethis:Dock Station 2
Hd Sata E Ide
3,5 E 2,5 Usb ...
Comprar
R$ 96,50
Windows 8.1 - 8
Pro 32/64 Bits -
Original - Vitali...
Comprar
R$ 89,89
Licena
Windows 8.1 - 8
Professional - ...
Comprar
R$ 89,89
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Max232 IC is a specialized circuit which makes standard voltages as required by RS232
standards. This IC provides best noise rejection and very reliable against discharges andshort circuits. If your project is more advanced and has to reliable you must use specialized
RS232 to TTL converter ICs. As I said Specialized are more expensive than other solutions.
One of such solution is Transistor based interface:
Transistors can be any general purpose transistors. This circuit is very easy and works
without problems. It is cheapest solution as it require couple of transistors and four resistors.
Two transistors does a trick to get a negative voltage as required by some PCs. When the PC
does not t ransmit data, its TX pin is stuck to a negative voltage. The negative voltage is
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Ease H-Bridge on MOSFET IRF7105
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AVR-DDS signal generator in-line ASM
explained
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David Fowler28 August, 2007 at 9:47 am
uCHobby has an article describing how the two transistor RS232 converter works.
You might find it interesting to reference.
http://www.uchobby.com/http://www.scienceprog.com/considering-solid-state-relays-ssr-for-your-projects/http://www.scienceprog.com/simulating-mosfet-based-bidirectional-3-3v-to-5v-logic-level-shifter/http://www.scienceprog.com/interfacing-microcontrollers-to-external-devices/http://www.scienceprog.com/electret-condenser-microphone-amplifier-for-use-in-microcontroller-projects/http://www.electronics-lab.com/blog/?p=28http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/http://www.scienceprog.com/avr-dds-signal-generator-in-line-asm-explained/http://www.scienceprog.com/ease-h-bridge-on-mosfet-irf7105-transistors/http://www.reddit.com/submit?url=http%3A%2F%2Fwww.scienceprog.com%2Falternatives-of-max232-in-low-budget-projects%2F&title=Alternatives%20of%20MAX232%20in%20low%20budget%20projectshttp://www.reddit.com/submit?url=http%3A%2F%2Fwww.scienceprog.com%2Falternatives-of-max232-in-low-budget-projects%2F&title=Alternatives%20of%20MAX232%20in%20low%20budget%20projectshttp://twitter.com/search?q=http%3A%2F%2Fwww.scienceprog.com%2Falternatives-of-max232-in-low-budget-projects%2Fhttps://twitter.com/intent/tweet?original_referer=http%3A%2F%2Fwww.scienceprog.com%2Falternatives-of-max232-in-low-budget-projects%2F&text=Alternatives%20of%20MAX232%20in%20low%20budget%20projects%3A&tw_p=tweetbutton&url=http%3A%2F%2Fwww.scienceprog.com%2Falternatives-of-max232-in-low-budget-projects%2F -
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http://www.uchobby.com/index.php/2007/06/11/ttl-to-rs232-adaptor-explained/
Reply
Dan Philips 12 February, 2008 at 11:51 am
Hi,
Good to know about this article. However if you need the full 5-pin interface and
are working with long RS232 cables at high speed it may still be useful to use a
MAX232 IC.
You can get the following quite cheap:
http://www.tronisoft.com/4201.php
The thing like is the PSU is built in so you can power the circuit and you Microchip
PIC projects in one go. Great for breadboarding!
Dan
Reply
Scott29 March, 2009 at 7:17 am
Great all-in-one-place article!
I was about to use a Max232 to translate old vintage computer current-loop to
RS-232. This is called a 20ma current loop digital interface. NOT to be confused
with more contemporary 4-20ma current loop analog interface. (Did I get that
right?).
Is there a simple sans-Max232 circuit for this (adapting 20ma current loop to RS-
232)?
Scott
Reply
honda4life 19 April, 2009 at 12:29 pm
The MAX232 schematic is wrong (at least it didnt work for me)!!!
I used this schematic
http://www.captain.at/electronic-atmega-mmc.php
http://www.captain.at/electronic-atmega-mmc.phphttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=752#respondhttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=750#respondhttp://www.tronisoft.com/4201.phphttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=749#respondhttp://www.uchobby.com/index.php/2007/06/11/ttl-to-rs232-adaptor-explained/http://ajiexku.wordpress.com/2008/11/18/alternatif-pengganti-ic-converter-max232-yang-murah/ -
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Reply
scienceprog 19 April, 2009 at 1:53 pm
Max232 works for me. Could be other factors that cause failure.
Reply
James 22 December, 2009 at 1:35 pm
Hi, Im building an unlocker cable for my cellphone but I dont have access to a
MAX232 which is required. Can I use any of the above alternatives instead ??
Thanks.
Reply
scienceprog 23 December, 2009 at 12:49 pm
Sure you can try. Most computer will work fine with any converter. But some may
be sensitive to different RS232 signal level. Just give a try.
Reply
Sami Levian 16 January, 2010 at 6:10 pm
Hi
What is different between MAX232N and MAX232 ?
Thanks
Reply
Aisha 3 February, 2010 at 11:29 am
Thanx =)
Reply
http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=760#respondhttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=759#respondhttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=758#respondhttp://www.scienceprog.com/http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=757#respondhttp://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=754#respondhttp://www.scienceprog.com/http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/?replytocom=753#respondhttp://leandron.wordpress.com/2010/02/12/arduino-na-protoboard-parte-1/http://solderintheveins.co.uk/2009/12/max232alternatives/http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/94640-remake-ic-components.html#post758755 -
8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
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8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
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1/9/2014 Alternatives of MAX232 in low budget projects - Do It Easy With ScienceProg
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8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
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ScienceProgon Programming AVR fuse bits oscillator settings
Gatimon Programming AVR fuse bits oscillator settings
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8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
10/12
1/9/2014 Alternatives of MAX232 in low budget projects - Do It Easy With ScienceProg
http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/ 10/12
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8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg
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1/9/2014 Alternatives of MAX232 in low budget projects - Do It Easy With ScienceProg
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