[Gmecm] ECM test bench

Fri Aug 4 14:52:53 UTC 2006

Yep.  This is why it's important to shop around before having a board laid out.  

10k pots - digikey part #CT2265-ND - $1.51
12 position terminal block - DK #27-1587-ND - $1.97

$3 for SPST switches is ludicrous.  Just a quick search found these board mount ones for $0.73 (#SW148-ND).  When you're buying between 4 and 10 of these various parts, every dollar you save really starts to add up.  I'm guessing you were spending close to $5-6 for those terminal blocks?  maybe $3 for pots?  I can see how you got to $75 in parts.  I can get a circuit and layout done in a week or two.  I hear you about the people disappearing.  I've lived through that with some other things I've sold.  Everyone's interested until it's time to pay up.

Ryan

rawardsr at ameritech.net wrote: Really?  Vertical position, board mounted?  What
terminal block?  C&K SPST switches are $3.00 min.

Sure LED's, 555's, and resistors are cheap, even at
Rat Shack's inflated prices, it is everything else
that costs a bit. Hell, some of the instrumentation
amplifiers I buy (INA101AM) run $25 each.

Whats your time to develop a circuit and layout?

You can get board costs down to ~$25 each provided
your willing to spend $500 bucks and order 25 boards. 
Set up fees alone are over $200.

Sure you can get the price down in volume.  The bugger
is when you go to sell one, all those that wanted one,
evaporate into thin air.  

Yes it is.  And yes they are..  Bob

--- Ryan Hess  wrote:

> To the contrary, I have.  Pots are $1.50,  12
> position terminal blocks are $1.97.  That's in
> quantities of one.  If I buy enough for 10 boards,
> prices drop significantly.  Boards will be easy to
> produce at $50ea.  
> 
> Is this Saturn5 by chance?  I see some sarcastic
> jabs...  
> 
> Ryan
> 
> rawardsr  wrote: Apparantly
> you haven't looked at how much pots, connectors, and
> switches 
> cost.  Good luck assembling all the bits (quality
> stuff) for less.
> 
> Let alone the cost for a low production board run..
> hehe.
> 
> First I've heard about that, and I'd look to the
> code first. Not is all 
> that is seems.  Bob
> 
> Ryan Hess wrote:
> > 1) Parts are expensive.  $75 for a few pots and
> some 555's?  
> > 
> > 2) I've heard there is crosstalk between the VSS
> and RPM outputs
> > 
> > 
> > 
> > rawardsr  wrote: What apparent problems?   First
> I've heard of any problems.  Bruce 
> > Plecan has three of these since day one and is a
> good freind.  Ain't 
> > said word one of any issues he has found.. And
> trust me, he'd tell me.  Bob
> > 
> > Ryan Hess wrote:
> > 
> >>I think I'd rather build something from the ground
> up, considering the costs (time) involved with
> fixing the apparent problems with the first batch...
>  Although I wouldn't mind taking a look at his
> design to have a starting point.  Ideally I'd like
> to see the cost get down to $100 with parts and
> board.  How realistic that is is yet to be seen. 
> I'm getting a preliminary budget together as we
> speak.  Cross your fingers ;)
> >>
> >>Ryan
> >>
> >>Mark Mansur  wrote: Bob (Saturn5) doesn't have any
> more PCBs for that board AFAIK. It's a nice 
> >>piece of equipment and I'd personally like to see
> him make some more. 
> >>Perhaps he'd be willing to hand-off to Ryan?
> >>
> >>-M
> >>
> >>
> >>----- Original Message ----- 
> >>From: "Steve Ravet" 
> >>To: 
> >>Sent: Thursday, August 03, 2006 8:51 AM
> >>Subject: RE: [Gmecm] ECM test bench
> >>
> >>
> >>
> >>
> >>
> >>>-----Original Message-----
> >>>From: gmecm-bounces at diy-efi.org
> >>>[mailto:gmecm-bounces at diy-efi.org] On Behalf Of
> Ryan Hess
> >>>Sent: Thursday, August 03, 2006 9:37 AM
> >>>To: gmecm at diy-efi.org
> >>>Subject: [Gmecm] ECM test bench
> >>>
> >>>Hi guys,
> >>>
> >>>Anybody here interested in an ECM test bench, or
> have a
> >>>source for one?  I would like to put together a
> test bench
> >>>for myself anyways, but obviously the more the
> merrier.
> >>
> >>
> >>Hey Ryan, I know you're on thirdgen also so you
> probably already know
> >>about this, but those guys designed one some time
> ago and the plans may
> >>still be available.  Bruce's original testbench is
> on the gmecm page but
> >>I don't think it used a PCB.
> >>
> >>--steve
> >>
> >>
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