[sdiy] The future of synth DIY

[Martin Czech]

and turn arround time.

discrete: no function. why? measure all nodes, ah pnp instead npn
          fixed, 2hours elapsed time

integrated: no function. why? heck, can't measure anything, e-beam to noisy,
            after severall days of ion milling, the 101th hyphothesis
            seems to hold true. Design change, fab run.
            samples, ok, better but not good,
            the next error that was hidden by the previous.
            elapsed time: 8 weeks
            

Discrete diy soldering and integration of monolithic circuits have
nothing in common. Design engineers for monolithic chips spend
*a lot* of time to think about "possible" errors in advance.
You wouldn't do that in discrete circuits, because it's so easy
to simply solder it and measure afterwards.

m.c.

            
:::X-Authentication-Warning: node12b53.a2000.nl: majordomo set sender to 
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:::Date: Fri, 02 Mar 2001 10:46:00 +0000
:::From: Emmanuel AMADIO <emmanuel at postimpressions.co.uk>
:::To: DIY Mailing list <synth-diy at node12b53.a2000.nl>
:::Subject: Re: [sdiy] The future of synth DIY
:::Content-Transfer-Encoding: 7bit
:::
:::Try fixing a circuit with a chip with no datasheets, no idea of what it can 
do....
:::It's bad enough with some commercial circuits, you certainly don't want to 
linearly enhance the chance of total failure
:::regarding to the number of custom chips.
:::Much a better idea to stick to discrete and available parts.
:::Matching would probably be worse because you need very good engineering 
skills to do that on a dye.
:::
:::Martin Czech wrote:
:::
:::> :::    It would be a dream come true....
:::>
:::> or a nightmare. Analog design for logic process is a pain in the a**.
:::> Even if you have a process more suitable for analog purposes
:::> you still need to fight down all kinds of problems you'll never
:::> encounter in discrete circuits. There is nothing like resistors
:::> from the shelf, capacitors, and neglegible parasitics.
:::>
:::> Only advantage you have is matching, and that is a science for it;s
:::> own.
:::>
:::> m.c.