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nuckolls.bob(at)aeroelect
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 Posted: Wed Jan 24, 2024 10:08 am Post subject: OVM-14 MkIII development (update) |
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Haven't been ignoring you guys . . . fun projects got
kinda diluted with holiday festivities and frivolities
along with a few home maintenance items that could
not wait . . .
But in the mean time:
I've been fiddling with the etched circuit for the
prototype OVM-14 upgrade . . . due to the very compact
ecb layout I was interested in exploring solder reflow
assembly processes using joint-by-joint application
of solder paste.
The experiments were frustrating. The consistency
and makeup of the solder 'paste' is critical. Samples
I had on hand proved problematic in that they were
reluctant to 'stick' to the pad until the component
was placed. Seems this stuff has a shelf life too.
Finally did conquer the process but while working
with these cute little boards, it occurred to me
that it was a bit late in my career life cycle
to be spooling up in new manufacturing processes and
inventorying new products!
To my way of thinking, the optimized assembly
configuration would lend itself to offering
bare boards or even kits in addition to limited
sales of completed assemblies while striving
for compact assembly.
Thought I give this a try:
The attached figure is a snapshot of the present
configuration OVM-14 ECB. It's not terribly
larger than the legacy CBOVMs. I've not used
this assembly technique in more years than I
can recall . . . first observed it in the
fabrication of my first solid state pocket
radio. A Regency TR1 that cost me a pretty
penny in newspaper route earnings about 1958!
Note the resistors stand on end soldered into
pads with very close spacing. This offers
a tighter layout opportunity with another
benefit: The upper end of each resistor can
be oriented such that it attaches to an
interesting 'test node' on the board. An
oscilloscope or voltmeter probe can be clipped
to the lead wire for performance evaluation
and/or troubleshooting.
What, you may ask, is that 'thing' hanging
off the end of the board? My short path
to low cost prototype boards is predicated
on a fixed 3.8 x 2.5 inch coupon. Hmmm . . .
what to do with that opportunity for a 'free'
ecb?
How about exploring a recently noticed LED
product that caters to night time drone
pilots? Red or green LEDs with built in
flashers. A bit slower than I'd like but
certainly bright enough. I've added a little
'parasite' board to the layout to proof an
idea for a precision low volts warning
annunciator with a very low parts count.
I'll publish drawings for the ECB
shortly with the notion of exploiting
any willing talents for proofing the
layout. I've got an order into Digikey
for thru-hole parts to assemble the prototypes
which should go VERY quickly.
This may not be the optimal route but I
think it's better than the rabbit hole
I dove into the first time. Let's see
what shakes out.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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| Posted: Thu Jan 25, 2024 3:57 am Post subject: Re: OVM-14 MkIII development (update) |
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Bob,
If you send me the schematic I can then make up a board with SMD and have it made by PCBway. They are very cost effective.
As an example the photo is an RF/audio probe I just finished using SMD. I used 1206 sized SMD for this.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10 |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jan 29, 2024 9:56 am Post subject: OVM-14 MkIII development (update) |
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At 05:57 AM 1/25/2024, you wrote:
| Quote: | --> AeroElectric-List message posted by: "merlewagner2" <wagnermerle(at)gmail.com>
Bob,
If you send me the schematic I can then make up a board with SMD and have it made by PCBway. They are very cost effective.
As an example the photo is an RF/audio probe I just finished using SMD. I used 1206 sized SMD for this. |
Thank you so much for the offer sir. BTW, nice
looking assembly. SMA connectors? What does it do?
I did a surface mount ECB and already have the
boards. However, while resolving some issues with
solder paste dispensing I had an epiphany . . .
I'm not at the stage of my 'career' to be
launching a project to be manufactured in
my shops.
Decided to convert it to thru-hole so that
I might offer kits . . . and perhaps get
some local kids interested in learning how
to put such things together. I've published
the 'plan-b' details in another posting. I'll
comb it for errors one more time and get
boards on order. Should be here Friday.
I'll also get an order in to Digikey for
parts compliment.
If you'd care to proof the layout yourself,
your input would be truly appreciated.
It's a bit risky to proof one's personal
work product . . . but then I'm probably
not telling you anything you don't already
know!
Yeah, about that 1206 footprint . . . that's
been my favorite choice for hand assembly for
the past 20 years or so!
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jan 29, 2024 10:02 am Post subject: OVM-14 MkIII development (update) |
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I've published the ECB layout and assy data at
https://tinyurl.com/ytdg9ehf
Any any assistance in proofing the layout to the
schematic would be appreciated. Will order boards
late tonight.
Got an order about ready to ship to Digikey for
parts.
We might get this project into smoke-test yet!
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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pjc
Joined: 13 Jan 2021
Posts: 7
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| Posted: Mon Jan 29, 2024 11:04 am Post subject: OVM-14 MkIII development (update) |
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Bob,
Still interested in being a beta-tester. With the through-hole redesign I can probably competently assemble it myself! Even better for my use case if the low voltage warning light/LED option is included.
Peter
| Quote: | On Jan 29, 2024, at 10:12 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
I've published the ECB layout and assy data at
https://tinyurl.com/ytdg9ehf
Any any assistance in proofing the layout to the
schematic would be appreciated. Will order boards
late tonight.
Got an order about ready to ship to Digikey for
parts.
We might get this project into smoke-test yet!
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Mon Jan 29, 2024 12:01 pm Post subject: OVM-14 MkIII development (update) |
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At 01:03 PM 1/29/2024, you wrote:
| Quote: | Bob,
Still interested in being a beta-tester. With the through-hole redesign I can probably competently assemble it myself! Even better for my use case if the low voltage warning light/LED option is included.
Peter
|
You're at the top of the list. We'll assemble the
first 'batch' here for testing. The lv warning
board gets trimmed off . . . that's a separate
project that's still under cultivation. But you
can have one of those too once they're ready
for prime time.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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| Posted: Mon Jan 29, 2024 1:16 pm Post subject: Re: OVM-14 MkIII development (update) |
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[quote="nuckolls.bob(at)aeroelect"]At 05:57 AM 1/25/2024, you wrote:
[quote]--> AeroElectric-List message posted by: "merlewagner2" <wagnermerle>
Thank you so much for the offer sir. BTW, nice
looking assembly. SMA connectors? What does it do?
/quote]
Bob, The unit displayed is an RF/audio probe for signal tracing. this feeds an amplifier. Yes, SMA connectors. It makes a nice compact unit using RG 174 as a lead. The probe is powered from the amp.
I am not sure how this is going to get displayed as I rarely use quotes or even reply.
Merle
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10 |
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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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| Posted: Tue Jan 30, 2024 7:02 am Post subject: Re: OVM-14 MkIII development (update) |
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| nuckolls.bob(at)aeroelect wrote: | I've published the ECB layout and assy data at
https://tinyurl.com/ytdg9ehf
Any any assistance in proofing the layout to the
schematic would be appreciated. Will order boards
late tonight.
Got an order about ready to ship to Digikey for
parts.
We might get this project into smoke-test yet!
Bob . . .
|
I looked at your layout and after finally figuring out the semantics it looks OK initially. It was confusing until I understood the numbering scheme for components.
For me it usually takes about 3 iterations to figure out what I forgot. At 82 I am finally recognizing a memory failure.
Merle
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
_________________
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10 |
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Fri Feb 09, 2024 8:55 am Post subject: OVM-14 MkIII development (update) |
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Boards are on order . . . stared at that last
iteration of the layout and finally succumbed
to an instance of 'creative destruction'. I've
re-laid the board to more conventional fabrication
philosophies. Yeah, it got a bit bigger but will
go together in minutes and 'look good'.
The assembly is now 2.2 x 0.7 inches and will
still 'house' nicely under a piece of heat
shrink.
Those interested in taking a peek can download
the proof prints at:
http://aeroelectric.com/DIY/OVM14%20mkII%20proof%20prints.pdf
The boards will be solder masked and silk screened
to facilitate kit-builders. Parts and boards will be
on hand for 15 prototypes next Thursday.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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1rv4
Joined: 11 Sep 2006
Posts: 24
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| Posted: Fri Feb 09, 2024 5:15 pm Post subject: OVM-14 MkIII development (update) |
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Hi BobVery interested in a kit or a completed and tested one.
Thanks
Chris
On Fri., Feb. 9, 2024, 9:10 a.m. Robert L. Nuckolls, III, <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | Boards are on order . . . stared at that last
iteration of the layout and finally succumbed
to an instance of 'creative destruction'. I've
re-laid the board to more conventional fabrication
philosophies. Yeah, it got a bit bigger but will
go together in minutes and 'look good'.
The assembly is now 2.2 x 0.7 inches and will
still 'house' nicely under a piece of heat
shrink.
Those interested in taking a peek can download
the proof prints at:
http://aeroelectric.com/DIY/OVM14%20mkII%20proof%20prints.pdf
The boards will be solder masked and silk screened
to facilitate kit-builders. Parts and boards will be
on hand for 15 prototypes next Thursday.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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pjc
Joined: 13 Jan 2021
Posts: 7
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| Posted: Wed May 29, 2024 9:52 pm Post subject: Re: OVM-14 MkIII development (update) |
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Bob (or others),
I’ve not been keeping up with the mailing list lately, and at some point there seemed to be a service outage, so apologies if I should know better., but …
Has there been any further progress on the “new” OVM module?
PJC
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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