Guest Bogzy Posted August 11, 2006 Share Posted August 11, 2006 Am facut schema atasata, dar nu merge. Am alimentat si consuma doar 2mA . Ce sa fac ? schema e luata de pe http://users.otenet.gr/~athsam/power_am ... et_eng.htm Va rog frumos sa ma ajutati Link to comment Share on other sites More sharing options...
niq_ro Posted August 11, 2006 Share Posted August 11, 2006 "Adjustment 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 More sharing options...
Guest Bogzy Posted August 11, 2006 Share Posted August 11, 2006 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 More sharing options...
niq_ro Posted August 11, 2006 Share Posted August 11, 2006 mda, nu-ti functionaza etajul final... vad pe desenul tau o multime de strapuri... sper ca le-ai montaj :axe: posteaza o poza cu montajul tau Link to comment Share on other sites More sharing options...
Guest Bogzy Posted August 11, 2006 Share Posted August 11, 2006 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 More sharing options...
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