Jump to content
ELFORUM - Forumul electronistilor

probleme amplificator 65W with hexfet

Guest Bogzy

Recommended Posts

  • Replies 4
  • Created
  • Last Reply



Previous to we supply the amplifier with voltage, we regulate the trimmer TR2 in the mid of his way and the trimmer TR1 in biggest resistance. We connect a multimeter in output pin J4 (measurement range 200mV DC), we give voltage in the amplifier and with the TR2 we regulate so that we take DC voltage in the output as possible near in the zero. We remove the supply and connect a multimeter (range 1A or 2A) in line with one from the supply cables. We again give supply in the amplifier and with the TR1 regulate late the current, so that we take clue roughly 330mA. We leave the amplifier to work for 10 min., without audio signal in his input. Afterwards the 10-min. usually the current stabilized in 230mA roughly. If it needs we adjust late so that we take clue near in 230mA. We again check the amplifier DC offset [J4] output, for changes DC and if it needs we regulate again with the TR2. [Elektor12/93]."


Inainte de a alimenta montajul, reglezi semireglasbilul TR2 in pozitia de mijloc, iar pe TR1 la valoarea maxima.

Conectezi un multimetru pus pe domeniul de tensiune continua de 200mV pe pinul J4 si J5 si reglezi semireglabilul TR2 astfel incat sa ai o valoare apropiata de 0V.

Deconectezi alimentarea si pui multimetrul pe domeniul de curent continuu de 1 sau 2A intre alimentaotr si amplificator. Alimentezi amplificatorul si reglezi din semireglabilul TR1 un curent de cca. 330mA. Lasi amplificatorul sa functioneza cca. 10 minute, fara semnal la intrare; ar trebui ca sa ai un curent de 230mA, daca nu, reglezi dinnou astfel incat sa ai 230mA.

Dupa aceea verifici tensiounea continua la iesire (J4) si daca e cazul reglezi din nou din semireglabilul TR2.

Link to comment
Share on other sites

Pai am facut ce scrie acolo..dar cand conectez aparatu de masura si incerc sa reglez nu se chimba valoarea...tot 2mA imi arata

Link to comment
Share on other sites

Pai si pe circuitu de pe site sunt multe strapuri. nu pot sa fac acuma o poza la circuit..dar am pus strapurile

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • 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