Jump to content
ELFORUM - Forumul electronistilor
vlad228

SARA-2016 detalii despre constructie

Recommended Posts

5 minutes ago, alexy said:

este ceva interesant in amplificator , softstartul conceput de tine 

Ai o obsesie cu acel SS? Care e problema?

 

Vrei un SS? 

Share this post


Link to post
Share on other sites

prea putini au postat poze , cu finalizarea , amplificatorului

Edited by alexy

Share this post


Link to post
Share on other sites
2 minutes ago, alexy said:

sincer , carcasa .table etc , surse radiatoare , ,transformatoare , si controler volum ,,voi monta amplificatoarele , , atat vreau sa am un amplificator calumea

Sa ne arati ce a iesit, sa luam lumina.

Share this post


Link to post
Share on other sites

Softstartul nu e interesant, este comun totalmente. Daca imi amintesc bine dar totusi nu sunt sigur, mai are un releu in plus astfel incat butonul de pornire sa vada o tensiune si un curent mic pe el. In rest cred ca mai sunt si circuitele speakers-delay. Nu-i nimic interesant acolo, s-a folosit ce era la indemana prin atelier.  Nu merita sa va focusati pe softstart. Ma repet, traful este de valoare, a fost de altfel si foarte scump.

Share this post


Link to post
Share on other sites

dar daca folosesc ptr sara doua transformatoare 625VA? numai trebuie sofstart

asta voi folosi doua transformatoare de 625VA  ,ptr sara

Share this post


Link to post
Share on other sites
Acum 11 minute, Mircea a spus:

Ceva documentatie ai care sa descrie ceea ce sustii? Nu am opinie nici pentru, nici contra, vreau sa invat. Asta ca sa nu scrii tu daca exista deja scris. Multumesc.

 

 Cumva este o imitatie a principiului din cablul star-quad.

Share this post


Link to post
Share on other sites
8 minutes ago, alexy said:

hai u , Mircea arata adevarul,,, , un clip , sau poze ,,,

Vezi Mircea nimeni,,,,,,,,,,,,,,,,,

Parca esti gurul ala de a plecat de pe forum pişandu-se cu boltă pe forum. 

 

La 625VA, unul sau doua, eu as pune un NTC in serie. Daca vrei sa-l suntezi sau nu cu releu, e treaba ta.

 

Apropo, dar intrerupatorul tau de ON-OFF ce caracteristici electrice are? Cate inrushuri va suporta pana se ard contactele?

 

Ca tot se vorbeste de lipsa de SS.

2 minutes ago, sk24bpo said:

 

 Cumva este o imitatie a principiului din cablul star-quad.

O sa caut pe Google. Multumesc.

Edited by Mircea

Share this post


Link to post
Share on other sites
Acum 4 minute, alexy a spus:

dar daca folosesc ptr sara doua transformatoare 625VA? numai trebuie sofstart

asta voi folosi doua transformatoare de 625VA  ,ptr sara

 

 Eu iti recomand sa folosesti softstart. Sunt o gramada de module pe net, la preturi modice, care isi vor face treaba excelent. 

Share this post


Link to post
Share on other sites

3 hours ago, Mircea said:

...

Despre star quad.

 

Dezavantajele sunt de neglijat, discutam de 20-40cm maximum intr-un amplif.

 

Avantaje:

When star-quad cable is used for a single balanced line, such as professional audio applications and two-wire telephony, two non-adjacent conductors are terminated together at both ends of the cable, and the other two conductors are also terminated together. Interference picked up by the cable arrives as a virtually perfect common mode signal, which is easily removed by a coupling transformer or differential amplifier. The combined benefits of twisting, differential signalling, and quadrupole pattern give outstanding noise immunity, especially advantageous for low signal level applications such as long microphone cables, even when installed very close to a power cable. It is particularly beneficial compared to twisted pair when AC magnetic field sources are in close proximity, for example a stage cable that can lie against an inline power transformer.

 

Dezavantaje:

The disadvantage is that star quad, in combining two conductors, typically has more capacitance than similar two-conductor twisted and shielded audio cable. High capacitance causes an increasing loss of high frequencies as distance increases. The high-frequency loss is due to the RC filter formed by the output impedance of the cable driver and the capacitance of the cable. In some cases an increase in distortion can occur in the cable driver if it has difficulty driving the higher cable capacitance.

The capacitance of a 4 conductor quad-star cable is roughly equal to the capacitance of a standard 2 conductor cable about 1.5 times as long. The increased capacitance of the star quad cable is not usually a problem with short cable runs, but it can be an issue for long cable runs. For example, an 8 m (25 ft) star-quad cable has a capacitance of 150 pF/m for a total capacitance of 1200 pF for the entire length of cable. With a 150 Ohm source impedance and 1200 pF load capacitance, the frequency response of this RC circuit is -0.02 dB at 20 kHz. If the cable was 80 m instead of 8 m, then the frequency response would be -0.2 dB at 20 kHz, and -3 dB at 88 kHz.

 

O sa incerc si eu o implementare de test.

Share this post


Link to post
Share on other sites

Uite, mai jos niste foto facute acum. Desi ascult la el de vreo 3 ani deja si tot de atunci este in varianta asta, nu il consider inca finalizat. 

Ultimile posturi ale userului alexy imi par totusi  puse din "plictiseala", ca sa nu spun altfel. E posibil sa fie o clona sau ceva. 

Oricum, plecand de la prezumtia de nevinovatie, atasez foto cu un amp terminat si functional. 

Spor! 

IMG-20200917-065723.jpg

IMG-20200917-065730.jpg

IMG-20200917-065739.jpg

IMG-20200917-065753.jpg

IMG-20200917-065759.jpg

IMG-20200917-065810.jpg

Edited by validae
litere

Share this post


Link to post
Share on other sites

@ alexy - TE ROG  nu mai pune clipuri muzicale pe forum; sunt offtopic chiar daca tu vrei sa transmiti vreo idee.

Ti-am mai scris odata acum cateva luni acelasi lucru. A treia oara aplic si penalizari.

Edited by Shambala

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.Terms of Use si Guidelines