Schematic po ng pc speaker ampli.

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Schematic po ng pc speaker ampli.

Post by james on Mon Apr 15, 2013 2:29 pm

Sino po meron schematic ng simpleng pc speaker amplifier gamit yung discreet transistor lang?

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Re: Schematic po ng pc speaker ampli.

Post by ultrasonic™ on Wed Apr 17, 2013 5:19 pm

low power lng ba sis? eto bka pwde sa requiremnt mo
5v operated nkita ko lng sa http://www.techlib.com/electronics/audioamps.html



The circuit above shows a 4-transistor utility amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The amplifier has a power isolation circuit and bandwidth limiting to reduce oscillations and "motorboating". The values are not particularly critical and modest deviations from the indicated values will not significantly degrade the performance.

Three cell battery packs giving about 4.5 volts are recommended for most transformerless audio amplifiers driving small 8 ohm speakers. The battery life will be considerably longer than a 9 volt rectangular battery and the cell resistance will remain lower over the life of the battery resulting in less distortion and stability problems.

The amplifier may be modified to work with a 9 volt battery if desired by moving the output transistors' bias point. Lowering the 33k resistor connected from the second transistor's base to ground to about 10k will move the voltage on the output electrolytic capacitor to about 1/2 the supply voltage. This bias change gives more signal swing before clipping occurs and this change is not necessary if the volume is adequate.

As before, the two 4.7 ohm resistors may be replaced with a single 10 ohm resistor in series with either emitter.


pa ot: dami ng ngkalat ngyon na mumurahin sa cdr-kong
lalo na ang mga ganito oh (^_^


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Re: Schematic po ng pc speaker ampli.

Post by james on Thu Apr 18, 2013 1:49 pm

Salamat sir admin. Kailangan ko kasi for reference.

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Re: Schematic po ng pc speaker ampli.

Post by james on Sat Apr 20, 2013 8:14 pm

Sir admin pwede ba gawin itong puro npn? Naubos kasi mga pnp dito na transistor. Mahirap maghanap ng kapalit.

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Re: Schematic po ng pc speaker ampli.

Post by ultrasonic™ on Mon Apr 22, 2013 12:44 pm

kng ung pnp tranny lng ang papalitan into npn type
di xa pwde sis kasi di xa magiging push pull

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Re: Schematic po ng pc speaker ampli.

Post by james on Mon Apr 22, 2013 9:28 pm

Wala bang ibang paraan sir? Bitin ang experiment ko.

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Re: Schematic po ng pc speaker ampli.

Post by ultrasonic™ on Wed Apr 24, 2013 3:38 pm

hhmmppff kng ung diag pa rin sa taas
i have no idea.. except kng mgdadagdag ako ng output trafo sa hulihan. erebias ko ang isang tranny... pero di ako xure kng gagana i mean kng maganda ang output (^_^

btw.. bat di mo nlng simulan sa 1 tranny sis



Tapos.. dagdag ka na nmn ng isa pa.. gawing darlington pair
sana nandito sila sir danny maganda kasi silang mg explane kysa sa akin...
di pa nmn ako master sa audio

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Re: Schematic po ng pc speaker ampli.

Post by james on Wed Apr 24, 2013 8:01 pm

Di ko naman sir basta maririnig kung isang transistor lang. Shocked

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Re: Schematic po ng pc speaker ampli.

Post by ultrasonic™ on Fri Apr 26, 2013 8:27 pm


hahahaha Uu nga noh (^_^

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Re: Schematic po ng pc speaker ampli.

Post by DJFEL on Mon Jun 17, 2013 9:57 pm

ok na to...

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Re: Schematic po ng pc speaker ampli.

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