Re: [Gumstix-users] TTL to RS232 converter

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If you double-check your diagram you should see polarity on the
capacitors - that means electrolytic.

Put  .1uf electrolytics in your circuit and you should be OK.

=20

___________________

Michael D. Black

bl...@es...

________________________________

From: gum...@li...
[mailto:gum...@li...] On Behalf Of
Michael Caughey
Sent: Monday, July 30, 2007 4:45 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] TTL to RS232 converter

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No I didn;t use electrolyis caps.  I just realized that I have .01 uF
caps.  The diagram requires .1 uF or 1 uF.  Thats likely my problem.  I
did have a diagram that showed .01 uF but I cannot find it now.  I
ordered 2 of the devices from sparkfun for now.

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My voltage is coming from a DC to DC converter.  I have a Mean Well
SKE15A-05 converter which I can either feed with a 11.2 LiPo battery or
12 V suply from the wall.  It gives a constant 5V.  I double checked it
anyways and I do have 5 volts.  This feeds my gumstix and XPress
Ethernet bridge as well.

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	----- Original Message -----=20

	From: Black, Michael <mailto:Michael.Black@EssexCorp.com> =20

	To: General mailing list for gumstix users.
<mailto:gum...@li...> =20

	Sent: Monday, July 30, 2007 5:26 PM

	Subject: Re: [Gumstix-users] TTL to RS232 converter

	=20

	What's your power supply?

	I assume you did use electrolytic capacitors?

	Do you indeed have 5V at pin 16?

	=20

	Sounds suspiciouslyi like your capacitors are wrong somehow.

	=20

	Can you post a schematic of what you did and maybe a picture
too?

	=20

	___________________

	Michael D. Black

	bl...@es...

=09
________________________________

	From: gum...@li...
[mailto:gum...@li...] On Behalf Of Pat
Winn
	Sent: Monday, July 30, 2007 3:58 PM
	To: General mailing list for gumstix users.
	Subject: Re: [Gumstix-users] TTL to RS232 converter

	=20

=09
http://www.sparkfun.com/commerce/product_info.php?products_id=3D449
=09
	Works quite well.

	On 7/30/07, Peter Vandrish <pet...@gm...> wrote:

	www.acroname.com has lots of level shifters ready to go

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	On 7/30/07, Michael Caughey < mi...@ca...
<mailto:mi...@ca...> > wrote:=20

	=09

		Has anyone been able to buy or make a TTL to RS-232
converter? =20

		=20

		I purchased a ST232 chip and some .1 uF capacitors and
tried to create one, but it's not working.  the places where the voltage
is supposed to be doupbled pin 2 +10 Volts and pin 6 -10 Volts its
reading +/- 3.2 volts.

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		Thanks,
		Michael

		=20

		"In the beginner's mind there are many possibilities. In
the expert's mind there are few."
		-Shunryu Suzuki

		=20

		=20

		=20

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