[sdiy] favorite Youtube genre - "old guys repairing electronics"

[sleepy_dog at gmx.de]

Ok, I did find *something*, that's 7 years old, poor camera, poor
photographer, and not made for demo'ing ;)
It does alas not show what I described w.r.t. some longer copper wire
connections being held in place in a less fragile manner by doing the
GND wires last ,with silver wire across thinner copper wires.
What is visible here are the legs of a 4x opamp DIP package (blue dotted
line) stuck in from the top side of the perfboard, and a bunch of 0805
SMT components soldered underneath.
This forms two sallen-key low pass filters IIRC, for some control signal
conditioning, and additionally the IC has 2 decoupling capacitors.
That would be 8 resistors, 10 caps.
You can see, about half the passive components are under the opamp,
making the whole thing take less board space than a only top-populated
THT circuit, even if you curve the one resistor leg to make a standing
resistor use 2 adjacent holes (making the populated board higher -
sometimes not what you want).
(this is less flat than it could be as I stacked capacitors in some
places to get a more close value to what was needed vs. what I had at hand)

https://i.postimg.cc/qvrMrtvM/SAM-0502-sml-annot.jpg


> Am 31.10.2020 um 16:12 schrieb David Simpson:
>> Hi Steve.
>> Thanks for this excellent description of your process. lots of
>> helpful tips.
>> Would love to see some pictures if you have them handy.
>
> I don't have anything handy that would somehow showcase especially the
> "tablet aided construction" as it were ;)
> I reckon the end result doesn't really look much different than anyone
> else's boards, other than I mentioned it specifically as an aid  to
> make circuits of somewhat higher density than usual experimentel
> perfboard circuits.
> I can imagine there are persons who find this too fiddly mucking with
> the software and are practised enough to just do it all in their head
> and by sight of the circuit flawlessly, but I'm not such a one, so I
> thought I throw it in there, maybe someone finds it useful.
>
> Forgot to mention about the green plated-through perfboards that many
> chinese eber sellers have,
> while the fact they have contacts from top to bottom can help, you
> also need to take extra care of course, to not make unintended
> connections, especially with the lazy use of not-insulated wires to
> make long traces I mentioned - then accidentally crossing one of the
> bottom side with one on the top.
>
>
>>
>>
>>
>> On Sat, Oct 31, 2020, 7:59 AM <sleepy_dog at gmx.de
>> <mailto:sleepy_dog at gmx.de>> wrote:
>>
>>
>>     Heh. If I need something quickly, cant wait for PCB, but also it
>>     does have certain physical dimension requirements,
>>     then I do get really "boring" and do "plan" perfboard - "what is
>>     the fun in that" someone asked - indeed, what is the fun in that
>>     sort of tedious, repetitive work alltogether?
>>     Better make it as short as, and least error prone possible. It's
>>     so much easier to reason about misbehavior of a circuit if it
>>     actually matches what you have drawn - at least from the obvious
>>     (not parasitic) components and their supposed connections.
>>     While it's perhaps reasonabnly unlikely to make mistakes if you
>>     have all the space in the world and basically solder together the
>>     circuit as-is-drawn on some big ass perfboard, also leaving lots
>>     of room for adding more stuff to experiment,
>>     as things get more crowded and less intuitively placed, I found
>>     the following to be helpful:
>>
>>     First of all, esp. for single-sided perfboard, I like to combine
>>     THT ICs with SMT 0805 passives, as you can often put them
>>     comfortably between legs and under the IC (on the bottom side of
>>     the board), that already saves a lot of space - and wiring effort.
>>     There are also these, often green, plated-through double-sided
>>     perfboards - may reduce the insulated connections you have to
>>     make (which take longer due to the need for burning away the
>>     insulation / tinning), e.g. all GND with silver wire on the
>>     bottom, +V on the top side, or so, other nets with insulated
>>     wire, where unconnected crossings would be at least.
>>
>>     Also, in the type of scenario where I would, if I could, prefer a
>>     small PCB, but don't want to wait,
>>     I might already have a captured schematic in my chosen EDA
>>     software anyway - or if it's small, I'll just do it quickly.
>>     Then convert to PCB, and usually don't route anything, or at best
>>     a few special traces to mark special preferences.
>>
>>     I put that on my small-ish tablet with stylus support, that
>>     actually fits on my crowded soldering bench.
>>     that also runs the EDA software. Then I:
>>
>>     foreach non-GND-net:
>>         highlight net in PCB software
>>         connect all net points in circuit with insulated "coil wire",
>>     point-to-point
>>         hide net's ratlines (or color existing traces) to make
>>     visible what's still TODO - this shrinks more and more, and you
>>     can see the light at the end of the tunnel
>>
>>     This, for me anyway, proved much less error prone than staring on
>>     a paper printout and comparing it with the current physical as-is
>>     schematic all the time (even when pencil checking traces ;) ).
>>     Can basically do that half-asleep without making a mistake. (just
>>     make sure to display the bottom side mirrored appropriately :D)
>>
>>     Then for the GND net I do the above, except I user silver coated
>>     copper wire, a bit sturdier, and wherever possible, do not cut,
>>     but bend around corners, using one long piece of wire across many
>>     connections, saving some work steps. The silver wire will be over
>>     all those coil wires, holding them in place a bit better, esp.
>>     longer ones, and make it less likely that you will rip off any
>>     connection by accidentally grabbing too hard anywhere.
>>
>>
>>     - Steve
>>
>>
>>     Am 31.10.2020 um 11:23 schrieb ShedSynth:
>>>
>>>     Hi all.
>>>
>>>     I use perfboard, but I don’t try to make it into a PCB.
>>>
>>>     I wire point-to-point with single core Kynar wire, normally used
>>>     for wire-wrapping.
>>>
>>>     I use blue, black, red and yellow on the back for -12V, GND, +5V
>>>     and +12V.
>>>
>>>     I use green for all signals, always on the component side.
>>>
>>>     I lay out the big things like pots, DIL sockets and capacitors
>>>     on the board itself, and always try to leave rows of 4 holes to
>>>     place resistors flat.
>>>
>>>     Then I follow the schematic, which might take several days –
>>>     this isn’t a mass-production process.
>>>
>>>     I separate each functional block with a pair of pins + a jumper
>>>     so I can test on the scope as I go and also so I can bodge
>>>     blocks of completed circuits into something else.
>>>
>>>     Hope this might help somebody,
>>>
>>>     Al
>>>
>>>     If the picture comes through, it’s most of a Thomas Henry
>>>     MAXIMUS 3340 VCO.
>>>
>>>     The front is just as ugly.
>>>
>>>     *From:*Synth-diy <synth-diy-bounces at synth-diy.org>
>>>     <mailto:synth-diy-bounces at synth-diy.org> *On Behalf Of *Timothy
>>>     Burns
>>>     *Sent:* 30 October 2020 15:17
>>>     *Cc:* SYNTH DIY <synth-diy at synth-diy.org>
>>>     <mailto:synth-diy at synth-diy.org>
>>>     *Subject:* Re: [sdiy] favorite Youtube genre - "old guys
>>>     repairing electronics"
>>>
>>>     Good lord, I wish I watched this yesterday. Also what the heck,
>>>     did he /plan/ before he started soldering in components? What
>>>     fun is that?
>>>
>>>     Thanks for the suggestions of video and audio channels, this
>>>     will be great to have on hand as I re-solder everything from the
>>>     last 36 hours.
>>>
>>>     I'm not saying I'm going to start now, but does anyone have
>>>     suggestions software or shortcuts for planning perfboard builds?
>>>     Fritzling? (Asking for a friend.)
>>>
>>>     Thanks All!
>>>
>>>     Tim
>>>
>>>     On Fri, Oct 30, 2020 at 10:34 AM Ryan B8S <ryan at pimpdroid.com
>>>     <mailto:ryan at pimpdroid.com>> wrote:
>>>
>>>         Not an old guy, but I can't believe no one mentioned Synth
>>>         Chaser at Synth Chaser dot com.
>>>
>>>         https://www.youtube.com/c/SynthChaser/videos
>>>
>>>         My favorite youtube channel by an order of magnitude.
>>>
>>>         On Wed, Oct 21, 2020 at 7:08 PM David Simpson
>>>         <davidosimpson at gmail.com <mailto:davidosimpson at gmail.com>>
>>>         wrote:
>>>
>>>             I recently found this video and was astonished by the
>>>             skill, technique quietude ala Bob Villa.
>>>
>>>             How to solder grid style PCB / 555 PWM DC-motor driver
>>>             (EEEL1-3) <https://youtu.be/_ypW45Y8VSs>
>>>
>>>             What are your favorite channels for
>>>             informative/instructive electronics repair? Preferable
>>>             those who don't yell or are in a constant state of
>>>             outrage...
>>>
>>>
>>>             --
>>>
>>>             david o. simpson | cameraperson | binarymob.com
>>>             <http://binarymob.com> | earth
>>>
>>>             _______________________________________________
>>>             Synth-diy mailing list
>>>             Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>             http://synth-diy.org/mailman/listinfo/synth-diy
>>>
>>>         _______________________________________________
>>>         Synth-diy mailing list
>>>         Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>         http://synth-diy.org/mailman/listinfo/synth-diy
>>>
>>>
>>>
>>>     _______________________________________________
>>>     Synth-diy mailing list
>>>     Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>     http://synth-diy.org/mailman/listinfo/synth-diy
>>
>>
>>     _______________________________________________
>>     Synth-diy mailing list
>>     Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>     http://synth-diy.org/mailman/listinfo/synth-diy
>>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20201031/5de17e0f/attachment.htm>