From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.215.173; envelope-from=stephen.izett@gmail.com
Content-Type: text/plain;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\))
Subject: Re: [FlyRotary] Re: EC3 hardware notes
Date: Tue, 23 Jun 2020 20:21:43 +0800
References: <list-406555@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-406555@logan.com>
Message-Id: <E74FF713-78CC-4E18-A6C1-E05693C2FD6F@gmail.com>

Thanks Bobby.

Steve

> On 23 Jun 2020, at 7:16 pm, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>=20
> Dennis H. and I used that circuit with the EC2. It=E2=80=99s external =
in the wiring near the EC2 connector. It=E2=80=99s not compatible with =
the EC3. Engine would not start.=20
>=20
> Bobby
>=20
> Sent from my iPad
>=20
> > On Jun 22, 2020, at 9:00 PM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > =EF=BB=BFI had this circuit from somewhere
> > <Renesis CAS Zener Circuit.pdf>
> >=20
> > Steve Izett
> >=20
> >> On 23 Jun 2020, at 9:22 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
> >>=20
> >> Just for the record.
> >> <ommkelgblomchfkc.jpg>
> >> The 1K resistor and the two 2.7V zener diodes are the CAS input =
clamping circuit.
> >>=20
> >> The rest is for redundant +5V to control panel (mixture voltage =
being the critical one).
> >> Vcc3 is J2 pin1 (+5V to control panel).
> >> I just used BAX16 diodes because I had them. Any 100mA (16V reverse =
voltage or more) diode will do.
> >> LM78L05 flat side down. Left pin is output. Center pin is ground =
and right pin is input.
> >>=20
> >> <jjfkkebmdbnhneko.jpg>
> >> If you want to secure components against vibration make sure you =
use Natural Cure Sealant (non -acidic)!
> >> I'm using Dowsil 737 RTV sealant.
> >> The auto parts store RTV is acidic and you don't want your circuit =
board damaged (etched) by that.
> >>=20
> >> Finn
> >>=20
> >>> On 6/17/2020 6:57 PM, Finn Lassen finn.lassen@verizon.net wrote:
> >>> In addition to the CAS input clamping circuit, Tracy also =
recommends shorting pins 1 and 3 of D18. The voltage drop across the =
diode to the PCM module causes slightly lower mixture and program =
voltage than the software was programmed for.=20
> >>>=20
> >>> However, if you are powering A and B controllers separately (e.g. =
separate fuses or busses), I have a better idea.=20
> >>> 1) Remove the D18 diodes (just below C45 which they feed).=20
> >>> 2) Add a LM78L05 (or similar) voltage regulator. After each (A and =
B) of the power (L1 and L2) input coils (+ on the big C20 and C21 =
capacitors) feed the input of the LM78L05 with a diode. Output of it =
goes to J2 pin 2 (or + on C45).=20
> >>>=20
> >>> Same principle as powering the PCM from either of the 5V =
regulators on the EC3 board, but the 0.7V diode drop now happens before =
the regulator, not after the 5V.=20
> >>>=20
> >>> CAS input clamping circuit:=20
> >>> 1) A 1K resistor between J2-5 and J2-15 (CAS input and ground).=20
> >>> 2) Two 2.7V zener diodes in series, arrows or striped ends =
(anodes) connected together. The non-striped ends (cathodes) to J2-5 and =
J2-15 respectively (CAS input and ground). (Basically in parallel with =
the 1K resistor). If you got the polarity of the zener diodes correct =
you should see the signal from the CAS sensor clamped to no more than =
0.7 + 2.7 =3D +-3.4 volts on an oscilloscope.=20
> >>>=20
> >>> I now have two bad chips (does not respond to reading or =
programming attempts -- do "work" in the EC3). The chip pins used to =
program the chip go to the Mode switch on the PCM. J2 pins 22 and 24. =
One might consider protection diodes for those pins. Oddly the pins =
continue working for Mode switch input, just not for re-programming the =
chip.=20
> >>>=20
> >>> The EC3 board was designed for in-circuit chip re-programming (set =
mode switch to zero or disconnect J2). Vpp/MasterClear are on J2 pin 11 =
(for A) and pin 1 (for B). PGC on pin 22 and PGD on pin 24. However, =
Tracy found that the combined capacitance of the programming pins of two =
chips made in circuit programming unreliable. I wonder if it might work =
if one could control the speed with which it communicates with the chip?=20=

> >>>=20
> >>> Finn=20
> >>>=20
> >>>=20
> >>> --=20
> >>> Homepage:  http://www.flyrotary.com/
> >>> Archive and UnSub:  =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
> >>>=20
> >>=20
> >>=20
> >=20
> > --
> > Homepage:  http://www.flyrotary.com
> > Archive and UnSub:  =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>=20
>=20
> Disclaimer
>=20
> The information contained in this communication from the sender is =
confidential. It is intended solely for use by the recipient and others =
authorized to receive it. If you are not the recipient, you are hereby =
notified that any disclosure, copying, distribution or taking action in =
relation of the contents of this information is strictly prohibited and =
may be unlawful.
>=20
> This email has been scanned for viruses and malware, and may have been =
automatically archived by Mimecast Ltd, an innovator in Software as a =
Service (SaaS) for business. Providing a safer and more useful place for =
your human generated data. Specializing in; Security, archiving and =
compliance. To find out more Click Here.
>=20