The switching power supply is too near to Speaker magnet and produce a udible buzzing during listening. But also fixing far from magnet, produce udible noise...
We can opt a Switching one or a Linear one but a linear could be Big and heavy) . Ideal are 32v/5a switching one or alternatively a transformer (sec 5 A min.) with a rectifier bridge and a high capacity electrolytic (4.700 uF)/50V) placed in parallel at the output . Better use a 0.1 uF in parallel with electrolitic one.
And now the electronics.... Class D amplifiers are very compact and have an excellent performance compared to those in class A / AB. The choice fell on this model that uses the STMicroelectronicsTDA7498 in class D available on EBAY for just over thirty euros. It is specifically designed to be coupled to a soobwoofer and can be powered up to 32V/6A.
The drilling table includes a 220V panel socket and two female RCA sockets (one per channel). The BF signal will be brought internally to the input of class D amplifier.
An official RPi power supply seems to be the key to getting high quality sound but we need a 12v 5A power subbly.. Beware of china models which are notoriously undersized power supplies which can introduce instabilities or explode in your face...
Step 4 was to find a 7โ LCD on the market to correctly display the Raspberry output without bulky monitors ... The choice fell on the original 7โ touchscreen Raspberry model with 800x480 resolution, which costs around 70 euros.
The old pi2B version does not have wifi/bluetooth chipset but is required to go online. The alternative is buying a rpi3B but why?๐ My magical drawer is full of any king of dongle... which will allow me to play music from other devices such as tablets or smartphones or from remote location...
The third step was to purchase the DAC and class D power amplifier hat to place on top of the Raspberry PI2B . A good choice was X5000 board selling by Suptronics with integrated 192 kHz/24bit high-quality ESS DAC and the Texas Instruments ClassD amplifier (TPA3118) offer up to 2x35w of crystal clear amplification for best sound quality. Referring to suptronics.com/miniPCkits/x500
It is the modification of an old project that you can see here gl-como.it/v2015/pi3-dac/ In particular, I removed the old DAC hat replacing it with a raspberrypi hat consisting of DAC and 35 + 35w power amplifier nor 5 amp switching power supply. Soon I will post Photo and links.... Stay tuned!
This voltmeter is suitable ebay.co.uk/itm/352627865033 . For the amperometer i will use an instrumets found in my drawer with a shunt resistance because 10A fullscale.
I need a 3-Digit-Digital Voltmeter and analog Amperometer with 30A /scale. I need also to add two rectangular hole on Front panel of Power Supply to put the instruments.
I will to MOD my old CEP 14H22F Power supply particularly suitable for RX/TX radio use. cepitalia.it/prodotti/22/14h22โฆ I wish to add an Amperometer and a voltmeter to visually check output parameter.
Today I've had an idea for a simple top, low waste, with an elastic drawstring neck that can be adjusted at different widths, including off-the-shoulders.
I've almost finished cutting a piece of fabric that I've had in my stash for a while, waiting for a suitable project (it has a non-uniform print that made it hard to decide a good pattern to make use of it).
It's most definitely a modern project.
So now the obvious thing to do is to sew everything by hand, right?
(I'm not sure whether this is to procrastinate cleaning the table with the sewing machine, or to be able to use tiny sewing allowances, since the fabric is very lightweight.)
Oggi ho avuto un'idea per un top semplice, low waste, con un collo a coulisse con elastico che puรฒ essere regolato su larghezze diverse, anche sceso sulle spalle.
Ho quasi finito di tagliare della stoffa che avevo nello stash in attesa di un progetto adatto (ha una stampa particolare che non era facile usare al meglio).
ร decisamente un progetto moderno.
Quindi adesso la cosa ovvia da fare รจ cucirlo a mano, giusto?
(Non so se io l'abbia deciso per procrastinare il riordino del tavolo con la macchina da cucire, o se sia per poter usare dei margini piรน sottili, dato che la stoffa รจ molto leggera.)
Problem: I only have one set and a half of vintage linen bedsheet.
Fact: I have about 7 m of vintage bedsheet-linen (~100 cm wide)
Obvious consequence: I now have to sew almost 3 m of a seam that should be extremely flat, plus two hems, on a deadline of โnext sheet changeโ, during a heatwave.
Problema: ho solo un completo e mezzo di lenzuola di lino vintage.
Fatto: Ho circa 7 m di stoffa di lino per lenzuola, alta 100 cm.
Conseguenza ovvia: devo cucire quasi 3 metri con una cucitura che deve risultare estremamente piatta, e due orli, con la scadenza di โil prossimo cambio di lenzuolaโ, durante un'ondata di caldo.
Un metro รจ stato cucito. Stamattina pensavo di cucirne altro, ma i miei piani sono stati cambiati drasticamente dal meteo e dal servizio ferroviario regionale.
next step: basting the hems, and then I think I'll use the sheets once before actually sewing them, to find out whether the length is right and to give myself more time to decide how I want to sew them exactly.
Prossimo passo: imbastire gli orli. E poi credo che userรฒ il lenzuolo una volta prima di cucirli, per controllare che la lunghezza sia giusta, ma anche per procrastinare la decisione su come voglio farlo.
@Elikorokoros un lenzuolo, semplicemente un lenzuolo, come li si faceva una volta: due teli cuciti assieme per il lungo con un sopraggito che unisce le cimoseยน, e poi due orli sui lati corti.
ยน come cucitura rimane abbastanza piatta da non sentirsi, ma essendo un lenzuolo matrimonale se anche si sentisse sarebbe solo un vantaggio, perchรฉ rimane sul confine tra le due metร letto e puรฒ servire per ricordare chi tende ad invadere che sta uscendo dai suoi confini.
Poi magari cerco di fare una foto, ma dubito di pubblicarla oggi
@Elikorokoros comunque, piรน che โbelloโ l'obiettivo qui รจ โfunzionaleโ.
Quella stoffa era discretamente ingiallita e macchiata; รจ stata lavata un po' di volte e dovrei essere riuscita a tagliare le parti con pochissime macchie, ma qualcosa รจ rimasto comunque.
Spero che con l'uso, i lavaggi con l'additivo sbiancante e il sole quando la si fa asciugare migliori o almeno non peggiori.
operazione per niente semplice quella di "sbiancare" i teli di lino "di una volta" perรฒ con ste temperature sono una salvezza e sticazzi le macchie, se pure dovessero essercene! @Elikorokoros
I love it when I wake up with a pretty low blood pressure, it's already starting to get hot, I haveยน to walk to the pharmacy, stuff happens and I don't manage to have breakfast before doing so.
at least it's a short walk, and there is also a convenient post box very close, so I also sent a postcard :)
ยน technically I could have asked my SO to go, instead we went together, but that meant that we had to go earlier
Adoro alzarmi con la pressione bassa, sta giร iniziando a fare caldo, devoยน andare in farmacia, succedono casini e non riesco neanche a fare colazione prima di andarci.
di buono c'รจ che รจ qui vicino, e c'รจ anche una comoda cassetta della posta quasi sul percorso, quindi ho anche spedito una cartolina :)
ยน tecnicamente avrei potuto chiedere al mio compagno di andarci, invece siamo andati assieme, ma la cosa dava piรน vincoli di tempo
Stop Trying to Make Social Networks Succeed รฉcrit par Ploum, Lionel Dricot, ingรฉnieur, รฉcrivain de science-fiction, dรฉveloppeur de logiciels libres.
My mother's washing machine is breaking down, and she lives close enough that I'm washing all of her laundry.
Now, I like being able to fill more loads and wash things more often, rather than have them accumulate until the laundry basket is overflowing, so I'm not encouraging her to buy a new machine (an attempt at repairing hers has already been done, and failed).
My real question is: should I do the proper #victorian thing and embroider my husband's initials on all of our household items? should I do a radical feminist thing and embroider my own initialsยน? And what should I do with the bedsheet that already has my great-grandfather initials on it?
ยน or rather design. which has the advantage of having a form that is extremely easy and quick to embroider, and I already use on my conference t-shirts that are identical to @Diego Roversi 's ones :D
@Lars Wirzenius a quick test told me that a qr code for a lesana id with reasonable settings is 28 ร 28 squares/pixels.
but maybe there should also be a prefix to tell the qr-code decoding application that this is a lesana id, and a collection identifier. which is still missing, in lesana, I should probably add it.
And then there is the whole โletting the QR decoding application know that that kind of code should be opened with lesanaโ, of course.
@Lars Wirzenius @Fabio Also, the clothing I've made is already in an inventory / tracker (that of sewing projects), so it has an id. for good measure I should also add that one too, right?
@liw FWIW, the last time I worked on something like this, we made up the `openpgpfpr:` prefix. if i would start over again, I would probably not make any prefix since, for compatibility and discoverability reasons, we would just look for something that looked like a FPR anyways. if you make a UUID, just look for a UUID in the QR code and you're done, no need for a prefix.
like @Fabio said, this is too practical, there isn't enough overengineering, it can't work (I mean, it would work as a way to separate the laundry, not as whatever it is that we're doing here) :D
Finally, the twitter shitstorm reached a point where I was personally affected and I had to do something. I just added a key combination to my keyboard map to easily get ๐ฟ.
E alla fine, il casino di twitter mi ha coinvolta personalmente, dandomi cose da fare. Ho appena aggiunto una combinazione di tasti alla mia mappa tastiera per poter digitare rapidamente ๐ฟ.
And I've just managed to refactor a long file with tons of #ifdef into a hierarchy of classes, in C++, a language I have vague notions about, through the establish industry practice of copying stuff from stackoverflow.
No, the code isn't anywhere where it can be seen.
Yes, if this fails somewhere the worst that can happen is that I have to get up from my chair to know whether the temperature is higher outside or inside.
And I really needed a project where I could give myself permission to do things that only work for me, rather than having to consider other possible usecases, and possibly even to do bad things, like this one.
โ(passeggiando per Roma) scorgiamo in fiamme un isolatoยน di notevole altezza, a molti piani; giร tutta la zona vicina bruciava in un incendio spaventoso. Allora uno degli accompagnatori di Giuliano disse ยซLa proprietร urbana offre grandi proventi, ma i rischi sono enormi, senza confronto. Se si potesse trovare un rimedio contro gl'incendi di case tanto frequenti in Roma, giuro che avrei giร venduto le mie campagne e comprato in cittร ยป.โ
(Aulo Gellio, trad. Giorgio Bernardi-Perini)
per caritร , apprezziamo l'onestร e la mancanza di ipocrisia, but stillโฆ
E per la gioia di @LaVi ๐๏ธ๐๐ e @Fabio il 2156 da Como a Cadorna ha investito una persona a Cesate, circolazione bloccata tra Milano e Saronno.
se i treni superano un tot di ritardi nel corso del mese fanno uno sconto sull'abbonamento del mese successivo, ma ci sono tutta una serie di eventi che non vengono contati, e credo che investire le persone sia tra queste.
Se si ha il biglietto, a quanto ne so ci si attacca.
@LaVi ๐๏ธ๐๐ ecco, in effetti il sito parla di malpensa che terminano / ripartono da Saronno, ma del resto dei treni (varese / como / novara) non dice niente
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Elena ``of Valhalla''
in reply to Elena ``of Valhalla'' • •Oggi ho avuto un'idea per un top semplice, low waste, con un collo a coulisse con elastico che puรฒ essere regolato su larghezze diverse, anche sceso sulle spalle.
Ho quasi finito di tagliare della stoffa che avevo nello stash in attesa di un progetto adatto (ha una stampa particolare che non era facile usare al meglio).
ร decisamente un progetto moderno.
Quindi adesso la cosa ovvia da fare รจ cucirlo a mano, giusto?
(Non so se io l'abbia deciso per procrastinare il riordino del tavolo con la macchina da cucire, o se sia per poter usare dei margini piรน sottili, dato che la stoffa รจ molto leggera.)
#cucito #ProblemiAutoindotti
rag. Gustavino Bevilacqua reshared this.
Sarah E Bourne
in reply to Elena ``of Valhalla'' • • •Elena ``of Valhalla''
in reply to Sarah E Bourne • •