Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 558946 for flyrotary@lancaironline.net; Tue, 07 Dec 2004 10:06:45 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iB7F6D4S029981 for ; Tue, 7 Dec 2004 10:06:14 -0500 (EST) Message-ID: <001801c4dc6e$094a3cf0$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: A/F Indicator Circuits Date: Tue, 7 Dec 2004 10:04:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01C4DC44.203FB770" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C4DC44.203FB770 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Nice to Have Re: ECU oxygen sensorJoe, unable to = quickly find my own diagram (might have lost if when the harddrive = crashed a month ago), but here are some URLs to circuits like the one I = used. Some even have part numbers and range from printed circuit boards = to hand wired. Let me know any questions you may have. This first one does not have a diagram but shows the bar LED which I = prefer, but others may use individual LED bulbs (your choice) http://www.markvanderkwaak.com/dbbp/tech-tips/mm.html This one is a simple version that uses a voltage regulator to maintain = stability (but not absolutely required) http://www.ffp-motorsport.com/tuning/o2meter.php?id=3D6 similar ones http://www.students.tut.fi/~eppu/dev/EGO-bar.html http://crash.ihug.co.nz/~nickf/images/o2meter.gif This one shows the two resistors as variable resistors so you can vary = brightness of the LEDs as well as adjust the voltage reference point = (useful as the O2 sensor ages). Note you can have the LED display as = either a single dot or as a bar depending on whether pin 9 on the LM3914 = chip is open or connected to V+ http://www.euronet.nl/users/fo_elmo/afdisplay.htm They are all pretty much the same based on the LM3914 chip. Hope one will be the right one for you {:>) Ed Anderson ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, December 06, 2004 11:20 PM Subject: [FlyRotary] Re: Nice to Have Re: ECU oxygen sensor Be Glad to, Joe. Its a fairly easy circuit with one easy to wire chip and while you can = use individual LED diodes, I would recommend one of the 10 LED bars - = much easier to wire up in my opinion that 20 tiny wires from 10 LEDs. I'll need to dig around in my files and come up with it. Send me a = reminder if you don't hear from me in a couple of days. Ed ----- Original Message -----=20 From: Joe=20 To: Rotary motors in aircraft=20 Sent: Monday, December 06, 2004 8:40 PM Subject: [FlyRotary] Re: Nice to Have Re: ECU oxygen sensor Ed, Would you mind sharing any of the electrical specs and / or wiring = diagrams for you LED A/F indicator? Thanks, Joe ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, December 06, 2004 7:59 PM Subject: [FlyRotary] Re: Nice to Have Re: ECU oxygen sensor I think the one Tracy sells is as good and inexpensive as they = come. All of the ones that I am familiar with use the same basic design = (except for the latest ones that use the new (and expensive) so-called = broad band sensor). I personally like the ones that use the 3/4 wire = sensor (these have their own heating element) as you do not have to wait = for the exhaust gas to warm up the sensor before it start working. They = are a bit more expensive that the 1/2 wire sensor may $10-20 more. I built my own LED A/F indicator and integrated it with my fuel = monitoring system. But regardless of whether you build or buy, they are = well worth having, in fact I would rather lose my EGTs than my LED A/F = indicator. Ed ----- Original Message -----=20 From: Bulent Aliev=20 To: Rotary motors in aircraft=20 Sent: Monday, December 06, 2004 3:18 PM Subject: [FlyRotary] Re: Nice to Have Re: ECU oxygen sensor On 12/6/04 2:20 PM, "Ed Anderson" = wrote: I certainly would not draw that conclusion, Bulent. I have = found theLED A/F indictors such a good indication of what my engine is = doing that I would hesitate to fly without it now. If the engine starts = to stumble you immediately know whether it because its too much or too = little fuel - sort of nice to know, trust me. {:>) Ed Anderson Thanks Ed, By any chance can you recommend one A/F indicator?. I have = installed the single wire O2 sensor that came with the engine. I may = even replace it? Bulent ------=_NextPart_000_0015_01C4DC44.203FB770 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Nice to Have =A0Re: ECU oxygen = sensor
Joe, unable to quickly find my own = diagram (might=20 have lost if when the harddrive crashed a month ago), but here are some = URLs to=20 circuits like the one I used.  Some even have part numbers and = range from=20 printed circuit boards to hand wired.  Let me know any questions = you may=20 have.
 
This first one does not have a diagram = but shows=20 the bar LED which I prefer, but others may use individual LED bulbs = (your=20 choice)
 
http://www= .markvanderkwaak.com/dbbp/tech-tips/mm.html
 
This one is a simple version that uses = a voltage=20 regulator to maintain stability (but not absolutely = required)
 
http://w= ww.ffp-motorsport.com/tuning/o2meter.php?id=3D6
 
similar ones
 
http://www.stu= dents.tut.fi/~eppu/dev/EGO-bar.html
 
http://crash.i= hug.co.nz/~nickf/images/o2meter.gif
 
This one shows the two resistors as = variable=20 resistors so you can vary brightness of the LEDs as well as adjust the = voltage=20 reference point (useful as the O2 sensor ages).  Note you can have = the LED=20 display as either a single dot or as a bar depending on whether pin 9 on = the=20 LM3914 chip is open or connected to V+
http://www.eur= onet.nl/users/fo_elmo/afdisplay.htm
 
They are all pretty much the same based = on the=20 LM3914 chip.
 
Hope one will be the right one for you=20 {:>)
 
Ed Anderson
 
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Monday, December 06, 2004 = 11:20=20 PM
Subject: [FlyRotary] Re: Nice = to Have Re:=20 ECU oxygen sensor

Be Glad to, Joe.
 
Its a fairly easy circuit with one = easy to wire=20 chip and while you can use individual LED diodes, I would recommend = one of the=20 10 LED bars - much easier to wire up in my opinion that 20 tiny wires = from 10=20 LEDs.
 
I'll need to dig around in my files = and come up=20 with it.  Send me a reminder if you don't hear from me in a = couple of=20 days.
 
Ed
----- Original Message -----
From:=20 Joe=20
To: Rotary motors in = aircraft=20
Sent: Monday, December 06, = 2004 8:40=20 PM
Subject: [FlyRotary] Re: Nice = to Have=20 Re: ECU oxygen sensor

Ed,
Would you mind sharing any of the = electrical=20 specs and / or wiring diagrams for you LED A/F = indicator?
Thanks,
Joe
----- Original Message ----- =
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Monday, December 06, = 2004 7:59=20 PM
Subject: [FlyRotary] Re: = Nice to Have=20 Re: ECU oxygen sensor

I think the one Tracy sells is as = good and=20 inexpensive as they come.  All of the ones that I am familiar = with=20 use the same basic design (except for the latest ones that use the = new=20 (and expensive) so-called broad band sensor).  I personally = like the=20 ones that use the 3/4 wire sensor (these have their own heating = element)=20 as you do not have to wait for the exhaust gas to warm up the = sensor=20 before it start working.  They are a bit more expensive that = the 1/2=20 wire sensor may $10-20 more.
 
I built my own LED A/F indicator =  and=20 integrated it with my fuel monitoring system.  But regardless = of=20 whether you build or buy, they are well worth having, in fact I = would=20 rather lose my EGTs than my LED A/F indicator.
 
Ed
----- Original Message ----- =
From:=20 Bulent Aliev
To: Rotary motors in = aircraft=20
Sent: Monday, December = 06, 2004=20 3:18 PM
Subject: [FlyRotary] Re: = Nice to=20 Have Re: ECU oxygen sensor

On=20 12/6/04 2:20 PM, "Ed Anderson" <eanderson@carolina.rr.com&g= t;=20 wrote:
I = certainly=20 would not draw that conclusion, Bulent.  I have found = theLED=20  A/F indictors such a good indication of what my engine = is doing=20 that I would hesitate to fly without it now.  If the = engine=20 starts to stumble you immediately know whether it because its = too much=20 or too little fuel - sort of nice to know, trust me.=20 {:>)

Ed=20 Anderson

Thanks Ed,
By = any chance=20 can you recommend one A/F indicator?. I have installed the = single wire=20 O2 sensor that came with the engine. I may even replace=20 it?
Bulent=20
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