[sdiy] More SBB Comments

[Scott Gravenhorst]

harrybissell <harrybissell at prodigy.net> wrote:
>Scott Gravenhorst wrote:
>
>> Also, in my opinion, a theatrical light dimmer circuit is something I would
>> consider a power circuit.  I would never have tried that on SBB.  Anything
>> that can potentially generate more heat than I can handle on my skin for
>> about 10 seconds is more than I'd want on SBB.
>>
>
>only the control circuit was on the breadboard... the power section was
>on an appropriate PCB. The problem was not the application, but the
>method used.
>
>For slow digital circuits (like old TTL) in educational environment, the
>SBB is probably 'ok'. I'd need to keep in mind that many 'newbies' might
>screw themselves worse with soldering irons than with the breadboard.
>
>Most of the vectorboard prototypes I have done (well... if they worked out)
>are in permanent enclosures and still working after 5, 10, 20 years... try THAT
>with
>an SBB.

This is entirely my point.  I would never try that.  That is something well
beyond proof of concept.

>
>Its also good to invest in the real prototype... you can try it later and
>compare to a PCB if you like.
>
>I had an envelope follower proto... and I picked it up later when I thought
>that
>I had made an error. (I'm thinking... it could not have possibly been THIS bad
>when
>I did it originally... ).  It wasn't... the new circuit had a damaged opamp.
>The original
>proto was still working well.
>
>(again... try THAT with an SBB... it would be disassembled by now :^)

Why wouldn't detection of a bad opamp be possible?  Because components are
easily swapped, this is something that I've done, even where illogical and as a
last resort.  One doesn't expect bad components unless they are from dubious
sources, however, there can be the odd new part that just won't work.  And my
opinion of this scenario is that the fault was not the SBB, it was the opamp.

>
>Sometimes... I take apart and recycle Vectorboard protos... if they were
>totally
>useless. The only downside (imho) is the cost of the pins... about $.04 each. A
>
>two cent resistor costs eight cents to install.  otoh... if you need to change
>the
>value... the pins allow that with almost unlimited re-soldering capacity.  I
>pull the
>old one out, heat the pin and slide the x-acto knife in the slot to keep it
>open.
>Put in new part, resolder. After about ten times... you might need some
>solderwick.
>
>here's a thought... A BBD in an SBB  :^P

Well, I think a BBD circuit would work mostly as well as it can on an SBB.

           (c;


>
>H^) harry
>
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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