Return-Path: Received: from [199.185.220.240] (HELO priv-edtnes46.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2541708 for flyrotary@lancaironline.net; Sat, 23 Aug 2003 02:43:19 -0400 Received: from Endurance ([209.52.209.207]) by priv-edtnes46.telusplanet.net (InterMail vM.5.01.05.17 201-253-122-126-117-20021021) with SMTP id <20030823051919.NGTQ2510.priv-edtnes46.telusplanet.net@Endurance> for ; Fri, 22 Aug 2003 23:19:19 -0600 From: "Haywire" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: EC2 Tach output Date: Fri, 22 Aug 2003 22:19:17 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01C368FB.6CF659B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_0024_01C368FB.6CF659B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Finn; Did you read the 768mV P-P with or without your circuit attached? Attached. I just clipped the lead into the plug. What's the counter chip you're using? CD4522BE IC BCD DIVIDE-BY-N CNTR 16-DIP I would imagine that you damaged it in your 20 volt tests, and it now clamps Tracy's output to 0.7V (typical diaode clamp voltage). The one thats being used right now, was never used on the breadboard. I've got 25 of 'em, so I used a different one for no particular reason. I thought the absolute max (power supply) ratings for CMOS chips (like 4000 and 74C.. series) were 18V. This one is rated for 20vdc according to the spec sheet. Certainly TTL chips (74..) are limited to 5V supply (5.25V max). Either that or you didn't read the scope right. I recorded it in memory, and I can interface the scope to my computer and send the image, for your interpretation. However it is a fairly idiot proof instrument (that's why even I can make it work :-) as it displays P/P, Max-P & Min-P along side of the waveform, so it's not even really necessary to interpret the waveform I actually had planned to take it back to the airport and do further testing tomorrow. I'd planned to use both channel A&B to record the input and output of the divider chip and record it at various rpm's. After reading your post, I'd also like to read the output without the counter chip attached. I finally have an inspection scheduled for noon tomorrow, so I'll be to busy to worry about this. I'll look into it next week. Now that Rusty seems to have found a suitable tach, and soon Tracy will be delivering the EM2 and also is considering a tach output for a conventional tach, this probably is not really worth the effort, however I will still experiment a little further if only for the educational value. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass". -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Finn Lassen Sent: Friday, August 22, 2003 7:44 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: EC2 Tach output ------=_NextPart_000_0024_01C368FB.6CF659B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi=20 Finn;

Did you read the 768mV P-P with or without your circuit = attached?

Attached. I = just clipped=20 the lead into the plug.

What's the counter chip you're using?

CD4522BE IC BCD DIVIDE-BY-N CNTR=20 16-DIP

I would = imagine that=20 you damaged it in your 20 volt tests, and it now clamps Tracy's output = to 0.7V=20 (typical diaode clamp voltage).

The=20 one thats being used right now, was never used on the breadboard. I've = got 25 of=20 'em, so I used a different one for no particular = reason.

I thought the absolute max (power supply) ratings for CMOS = chips (like=20 4000 and 74C.. series) were 18V.

This one = is rated for=20 20vdc according to the spec sheet. =

Certainly TTL chips (74..) are limited to 5V supply (5.25V = max).

Either that or you didn't read the scope right.

I=20 recorded it in memory, and I can interface the scope to my computer and = send the=20 image, for your interpretation. However it is a fairly idiot proof = instrument=20 (that's why even I can make it work :-) as it displays P/P, Max-P & = Min-P=20 along side of the waveform, so it's not even really necessary to = interpret the=20 waveform

I=20 actually had planned to take it back to the airport and do further = testing=20 tomorrow. I'd planned to use both channel A&B to record the input = and output=20 of the divider chip and record it at various rpm's. After reading your = post, I'd=20 also like to read the output without the counter chip attached.=20

I finally have an inspection scheduled for noon = tomorrow,=20 so I'll be to busy to worry about this. I'll look into it next week. Now = that=20 Rusty seems to have found a suitable tach, and soon Tracy will be = delivering the=20 EM2 and also is considering a tach output for a conventional tach, this = probably=20 is not really worth the effort, however I will still experiment a little = further=20 if only for the educational value.

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

= =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to pass".

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Finn=20 Lassen
Sent: Friday, August 22, 2003 7:44 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: EC2 Tach=20 output

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