alternatives of max232 in low budget projects - do it easy with scienceprog

8/11/2019 Alternatives of MAX232 in Low Budget Projects - Do It Easy With ScienceProg

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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

transistors

AVR-DDS signal generator in-line ASM

explained

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Pingback: Electronics-Lab.com Blog Blog Archive Alternatives circuits of MAX232

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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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Pingback:Alternat if pengganti IC converter MAX232 yang murah Weblog gw

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


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Windows 8.1 - 8

Pro 32/64 Bits -

Original - Vitali...

Comprar

R$ 89,89

Dock Station 2

Hd Sata E Ide

3,5 E 2,5 Usb ...

Comprar

R$ 96,50

Licena

Windows 8.1 - 8

Professional - ...

Comprar

R$ 89,89
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