I shouldn't comment on prices but for SMD
I'd guess at $US1.18 for LM324, 9 resistors, 3 caps & a zener - (or $NZ2.40
max) overall cost very dependent on pcb size, shape etc.

Displays, PCB, connectors and metalwork are the major cost items. Standard
electronic component costs are pretty well negligable by comparison.


Of course if you buy everything from RS......

By the way - what temperature are you running at. We have had to change to
LM224s to meet high temperature requirements (and we pay more as a
consequance).

Richard

> -----Original Message-----
> From: Wagner Lipnharski [mailto:wagnerl@EARTHLINK.NET]
> Sent: Thursday, July 15, 1999 11:04 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Sigma Delta Converter
>
>
> Linear Technologies said about $14.
> LM324 + Zener + 9 resistors + 3 capacitors would take you
> close to $4 to
> $6, considering that the LTC2400 is 24 bits ADC, your cost is totally
> proporcional to dollars per bits of resolution.
> Remember that LTC2400 is quite new, less than 6 months old, some
> distributors don't have it available yet since it is not consumed in
> billions, but because its easy operation I believe it would has a nice
> place into the marketshare of ADC's.
> Wagner.
>
> Russell McMahon wrote:
> >
> > Yes, LTC2400 is  a very nice product indeed but not suitable for my
> > application due to the need for ultimate low cost. The processor is
> > set due to other considerations and I must live withing its
> > constraints while costing approx nothing at all. What I
> have achieved
> > (see separate post) will do what I want (9 or 10 bits accuracy - 8
> > probably OK) using an LM324, 9 resistors (including an amplifier and
> > "reference", zener and 3 capacitors. Assembly costs and board space
> > costs all add up but still far below LTC2400 cost I imagine - I
> > couldn't find a price at Digikey, Pioneer or Netbuy. How
> much are you
> > buying them for?
> >
> > RM
>