otl booster (output transformerless)

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otl booster (output transformerless)

Post by longthrow on Fri Jan 20, 2012 9:58 am

otl w/ trimmer:



otl w/ servo:



split psu:





notes:
using dmm, adjust trimmer to set output closest to 0Vdc & should not be more than +/-50mV

its better to use A1943 & C5200 than MJ2955 & 2N3055 if you want to crank more power
also after upgrading, you can run it further to +/-40v supply (30v-0-30v ac)

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Re: otl booster (output transformerless)

Post by 01110011 on Sat Jan 21, 2012 12:16 pm

wow galing! new version ng classic booster amp

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Re: otl booster (output transformerless)

Post by arkin on Sun Jan 22, 2012 10:05 am

sa ako to sir design longthrow.2 iya version:1.similar lng sa basic boster,using cutomized input[preha sa vt22]w/ separate bias resistor.emiter stabilizer sa output.split 12v power suply.ang 2nd,bsin similar sa imo design.sorry,im not sure!sealed man gud,naa something epoxy nga gibulit sa PCB..

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Re: otl booster (output transformerless)

Post by longthrow on Tue Jan 24, 2012 8:18 am

same diay sa akoa proj pag 2nd yr. college, niadtong 1998, pero +/- 18v ang supply. noted ang sec polarity else mag cancel ang output:


ang prob gud sa common emitter is stability, but it still works.
your almost there on the devt cheers

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Re: otl booster (output transformerless)

Post by 01110011 on Wed Jan 25, 2012 7:24 pm

sir kung itaud ni sya sa sakyanan tagsa ug battery kada rail? o naa sya smps?

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Re: otl booster (output transformerless)

Post by longthrow on Wed Jan 25, 2012 8:59 pm

smps is the best psu para ani, either using tl494 or sg3525 & ferrite transformers.
pero naa pud simple alternative like this: (using laminated iron core)


pwede pud butangan og pulse driver @ 50% duty cycle & f=50-60Hz ang 3055 for added stability.

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Re: otl booster (output transformerless)

Post by arkin on Fri Jan 27, 2012 4:25 pm

pwede ka gmit batery,pro doble.example:12v,2 ka batery imo gmiton since split suply mna..how?series nmo ang 2 batery[morag gi 24 bah]tap nmo ang b+ sa + terminal sa 1st bat.tap nmo b- sa - terminal sa 2nd bat.ang ground tap nmo sa + og - nga naglink sa duha ka batery.problem:on higher supy daghan batery imo knahanglan.

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Re: otl booster (output transformerless)

Post by 01110011 on Mon Jan 30, 2012 8:00 pm

ah cge salamat sirs Smile
mahala raba sa battery oi apologies

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Re: otl booster (output transformerless)

Post by arkin on Fri Feb 03, 2012 12:29 pm

longthrow,ask lng:connected na ang resistor sa output?[knang doul sa input]dba dapat ground na i-connect?

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Re: otl booster (output transformerless)

Post by longthrow on Wed Feb 08, 2012 11:10 am

connected sa output.

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Re: otl booster (output transformerless)

Post by Deep Bass on Fri Jan 11, 2013 2:13 pm

mga sir magandang araw,pasensiya medyo mahina ako sa electronic,magtatanong lang sana,ano ang gamit sa trimmer dito?ano ang servo?at dmm?wait ko sa rply thanks GOD BLESS

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Re: otl booster (output transformerless)

Post by longthrow on Fri Jan 11, 2013 7:33 pm

trimmer- manual zero offset voltage adjustment
servo- 741 ckt for automatic zero offset voltage adjustment

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Re: otl booster (output transformerless)

Post by Deep Bass on Fri Jan 11, 2013 8:15 pm

sir longthrow thanks sa rply pwede visaya?hehe joke if ever mag assemble ko ani asa man ani ako sundun w/trimmer w/servo?if ever lang,thanks

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Re: otl booster (output transformerless)

Post by longthrow on Sat Jan 12, 2013 12:58 am

ang naay servo para walay hasol sa trimmer og mas accurate gyud nga ang output dc offset is @ minimum regardless on the supply fluctuation.

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Re: otl booster (output transformerless)

Post by Deep Bass on Sat Jan 12, 2013 1:27 pm

thank you so much master,more power sau,thank you so much gyud sa pag share sa imo knowledge,pasensiyae na me mga newbie

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Re: otl booster (output transformerless)

Post by pyroelectro on Sat Jan 26, 2013 12:28 pm

+1 sayo sir longthrow. Ganda ng Design

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Re: otl booster (output transformerless)

Post by michael nierva on Mon May 06, 2013 3:34 pm

mga master pwede nyo po ba akong matulongan about booster amp. using mj2955, kung panu mag rewind ng audio output transformer 500 watts mono o any reference kung paanu ako makakapaggawa tnks

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Re: otl booster (output transformerless)

Post by brylle45 on Mon Jun 03, 2013 7:49 pm

ilan po ang wattage nito po sir?

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Re: otl booster (output transformerless)

Post by longthrow on Mon Jun 03, 2013 8:03 pm

approx 100w into 8ohms using 30-0-30 transformer

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Re: otl booster (output transformerless)

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