Return-Path: Received: from [199.185.220.221] (HELO priv-edtnes10-hme0.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2509402 for flyrotary@lancaironline.net; Fri, 01 Aug 2003 22:53:34 -0400 Received: from Endurance ([209.53.248.88]) by priv-edtnes10-hme0.telusplanet.net (InterMail vM.5.01.05.17 201-253-122-126-117-20021021) with SMTP id <20030802025332.VLJO1589.priv-edtnes10-hme0.telusplanet.net@Endurance> for ; Fri, 1 Aug 2003 20:53:32 -0600 From: "Haywire" To: "flyrotary" Subject: Tach Divider Date: Fri, 1 Aug 2003 19:53:22 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0079_01C35866.8FFFF290" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0079_01C35866.8FFFF290 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hey Guys; I've got my Tach working finally. I used a programmable BCD divide-by-N counter (CD4522B) mounted on a small piece of prototype board, soldered on the appropriate jumpers, a couple of resisters, a few leads, sealed it all up with heat shrink and it made a neat little package to put inline with the EC2 tach output. I set it to divide-by-4, then set the tach for "6 cyl". I chose this as it was slightly easier for lead routing to set the input pins HI/LOW as required but it would be just as simple to set for 4 or 8 cyl if desired. I haven't yet checked for accuracy, but tomorrow I think I can borrow an optical tach. It seems to give me the expected engine speeds. I tested it first on a digital breadboard lab and simulated engine RPM pulses and it divided accurately. I took some pics of it on the breadboard, then on the prototype board and a finished package. I will develop film and post pics. I bought 25 of these counters from Digi-Key and have a little extra board so I can make up a few more of them, so if anybody else is using the LS1 coils and needs to use a regular tach (Rusty?), let me know and you can have one for the price of a beer if we ever meet in person (if it's American beer, you'd better make it 2 beers :-). 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". ------=_NextPart_000_0079_01C35866.8FFFF290 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hey=20 Guys;

I've got my Tach working finally. I used a programmable BCD = divide-by-N=20 counter (CD4522B) mounted on a small piece of prototype board, soldered = on the=20 appropriate jumpers, a couple of resisters, a few leads, sealed it all = up with=20 heat shrink and it made a neat little package to put inline with the EC2 = tach=20 output.

I=20 set it to divide-by-4, then set the tach for "6 cyl". I chose this as it = was=20 slightly easier for lead routing to set the input pins HI/LOW as = required but it=20 would be just as simple to set for 4 or 8 cyl if = desired.

I=20 haven't yet checked for accuracy, but tomorrow I think I can borrow an = optical=20 tach. It seems to give me the expected engine speeds. I tested it first = on a=20 digital breadboard lab and simulated engine RPM pulses and it divided=20 accurately. I took some pics of it on the breadboard, then on the prototype = board and=20 a finished package. I will develop film and post = pics.

I=20 bought 25 of these counters from Digi-Key and have a little extra board = so I can=20 make up a few more of them, so if anybody else is using the LS1 coils = and needs=20 to use a regular tach (Rusty?), let me know and you can have one for the = price=20 of a beer if we ever meet in person (if it's American beer, you'd better = make it=20 2 beers :-).

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".

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