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Re: [FlyRotary] Nice to Have Re: ECU oxygen sensor
Joe, 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)
This one is a simple version that uses a voltage
regulator to maintain stability (but not absolutely required)
similar ones
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+
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 -----
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 -----
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 -----
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 -----
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" <eanderson@carolina.rr.com>
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
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