Pratica di Shadowing: What are PCBs and PCBAs? The 'PCB basics' - Impara a parlare inglese con i video
Creazione lezione...
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Welcome to this video series where we're going to be looking at PCBs.
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This is the first video and we're going to be looking at PCB basics.
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So what's the difference between a PCB and a PCBA?
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Well you can generally refer to a blank unstuffed and unsoldered printed circuit board as a PCB.
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You can see an example of this on the top image here.
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The assembled and soldered assembly is then known as a PCBA or a board assembly or simply a PCA.
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And you can see an example of this on this bottom image.
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So if we look at the two differences,
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the top one clearly has no components on it whereas the bottom has a fully populated set of components.
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So the basic understanding of a PCB.
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A basic PCB consists of a flat sheet of insulating material and a layer of copper foil laminated to the substrate.
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Chemical etching divides the copper into separate conducting lines called tracks or circuit tracers,
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pads for connections, wires to pass connections between layers of copper.
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The tracks function as wires fixed in place and are insulated from each other by air and the bored substrate material.
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The surface of the PCB may have a coating
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that protects the copper from corrosion and reduces the chances of solder shorts between traces
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or undesired electrical contact from stray bare wires.
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This coating is called the solder resist.
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You can see an example of a bare PCB here on the right
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where we can clearly see the tracks and the holes
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or the wires going from one side of the board to the other.
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So what makes up a PCB?
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The basic PCB consists of four layers, which are heat laminated together into a single board.
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The four layers are substrate, copper, solder mask and silk screen.
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The substrate needs to be thermally stable and the most common material used is FR4.
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FR4 is a glass epoxy high pressure thermoset plastic laminate with good strength to weight ratio with near zero water absorption.
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FR simply stands for Flame Retardant.
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And you can see the basic layers here in this image, where we have the substrate, the copper, the solder mask and the silkscreen on top.
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So what are the different layers on top of the FR4?
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First we have the copper layer, which is the electrical conductor where the tracks are etched, which make up the circuit.
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The thickness can vary depending on the power requirements, but in general the thickness is around 35 microns or equivalent to 1.4 thou.
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Second is the solder mask layer and this gives the PCB its green color.
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Its purpose is to insulate the copper tracks from contact with metal, solder or other conductive items.
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And third, the silkscreen layer is a combination of shapes, letters, symbols and instructions.
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It provides identification for each part and you can clearly see
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that in this image where we have part identifications don't forget to check out our other videos in this series
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and you can always contact us
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if you need any help with your projects in China
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so don't forget to a like share and subscribe
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if you hit this little bell symbol
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that will notify you of any new content that we upload
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so thanks for listening my name is Paul Adam from South East and I shall see you in the next video
📺 Stesso Canale
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Vocabolario e note di pronuncia per questa lezione
Questo video contiene 42 frasi e 567 parole da ripetere con lo shadowing. Il parlato dura 3:55. Chi parla mantiene un ritmo costante di circa 145 parole al minuto, comodo per lo shadowing. Solo il 73% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| layer sostantivo | /ˈleɪ̯ɚ/ | strato |
| copper sostantivo | /ˈkɒpə/ | rame |
| substrate sostantivo | /ˈsʌbˌstɹeɪt/ | substrato |
| wire sostantivo | /ˈwaɪɚ/ | filo, filo metallico |
| mask sostantivo | /mæsk/ | maschera, mascherina |
| coat sostantivo | /ˈkoʊ̯t/ | mantello, cappotto |
| component sostantivo | /kəmˈpoʊ.nənt/ | componente |
| symbol sostantivo | /ˈsɪmbəl/ | simbolo |
| identification sostantivo | /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/ | identificazione |
| consist sostantivo | /kənˈsɪst/ | composizione, configurazione |
| thickness sostantivo | /ˈθɪknəs/ | spessore, grossezza |
| stable sostantivo | /ˈsteɪ.bəl/ | stalla, scuderia |
| refer verbo | /ɹɪˈfɜː/ | riferire |
| whereas | /(h)wɛɹˈæz/ | laddove, mentre |
| sheet sostantivo | /ʃit/ | foglio |
I phrasal verb che sentirai
| Parola | Pronuncia | Significato |
|---|---|---|
| make up verbo | /ˌmeɪk ˈʌp/ | comporsi |
| check out verbo | investigare |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | are insulated · is called · are etched |
| Frasi relative who / which + frase — un’informazione in più su una persona o una cosa | layers, which are · layer, which is |
Pronuncia a cui fare attenzione
Chi parla usa 4 contrazioni e forme ridotte, come don't, we're. Pronunciale nella forma breve, così come le senti.
- I suoni “sh” e “zh”: identification /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/, sheet /ʃit/, ratio /ˈɹeɪ.ʃoʊ/, instruction /ɪnˈstɹʌkʃən/, absorption /æbˈsɔɹp.ʃn̩/
- Parole lunghe — attenzione all’accento: electrical /ɪˈlɛktɹɪkəl/, identification /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Fai shadowing frase per frase a velocità normale, ripetendo ognuna finché il tuo ritmo coincide con quello di chi parla.
- Registrati e confronta con l’originale, facendo attenzione a parole come layer, copper, substrate.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.