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Author Topic: P3A amp 100 watts Help  (Read 29627 times)

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #320 on: May 05, 2012, 09:27:25 AM »
INPUT transistor:     fairchild       2N5551
                            hitachi        2SC1775
                            toshiba        2SC2240

VAS transistor:
                            toshiba       2SC3423 / 2SA1360   
                            fairchild       KSC3503 / KSA1381
DRIVER transistor:
                            toshiba       2SC4793 / 2SA1837         
                         
OUTPUT transistor: 
                            toshiba       2SC5200 / 2SA1943=150 watts     
                                             2SC5198 / 2SA1941=100watts

For P3A trannies       ;) :) :D

Magkano ba ang 5198/1941? kalahati lang ng presyo ng 5200/1943?
Kung 24-0-24Vac supply mo, sa 5200 ka na, with 1 pair output pwede ka pang mag-operate ng 4 ohms.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

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Re: P3A amp 100 watts Help
« Reply #320 on: May 05, 2012, 09:27:25 AM »

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #321 on: May 05, 2012, 10:57:17 AM »
Brod Engineer Johannah, Gusto ko  mag assemble ng  P3A part 2 at gusto ko higher wattage choice ko 2SC5200 at 2SA1943. Ano ba match na transformer sa pang 100 watts na P3a ??? I mean yung rated voltage at amperes to reach 100 watts.  kasi yung 24v o 24v 6 amperes na transformer ko di niya kaya ang Klipsch speaker ko parang kulang sa power pero pag low volume ok naman. gusto ko i try yung mas higher power.
yung 5198 dito 70 pesos at 1941 70 pesos din.ito yung sa first P3A experiment ko.thanks ulit. :D
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

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Re: P3A amp 100 watts Help
« Reply #321 on: May 05, 2012, 10:57:17 AM »

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #322 on: May 05, 2012, 11:09:11 AM »
Brod Engineer Johannah, Gusto ko  mag assemble ng  P3A part 2 at gusto ko higher wattage choice ko 2SC5200 at 2SA1943. Ano ba match na transformer sa pang 100 watts na P3a ??? I mean yung rated voltage at amperes to reach 100 watts.  kasi yung 24v o 24v 6 amperes na transformer ko di niya kaya ang Klipsch speaker ko parang kulang sa power pero pag low volume ok naman. gusto ko i try yung mas higher power.
yung 5198 dito 70 pesos at 1941 70 pesos din.ito yung sa first P3A experiment ko.thanks ulit. :D

35-0-35Vac at a minimum of 10amps at 10,000uf caps per rail. Mas mganda pag separate rectifier and caps bawat channel.
Yung post ko pwede mong pagbasehan, nasa page 8.
Dito dapat 2 pairs ka na ng 5200/1943 for safe operation on 4ohms.

Wag mo ng lagyan ng engineer yung pangalan ko bro, kakahiya nman. ;)
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

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Re: P3A amp 100 watts Help
« Reply #322 on: May 05, 2012, 11:09:11 AM »

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #323 on: May 05, 2012, 11:20:23 AM »
ok brod thanks plus 1. scan ko page 8. engineer kasi naririnig ko sa mga taga transcoo tawagan nila.  :D
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Philippine Electronics Forum

Re: P3A amp 100 watts Help
« Reply #323 on: May 05, 2012, 11:20:23 AM »

Offline jlester87

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Re: P3A amp 100 watts Help
« Reply #324 on: May 05, 2012, 11:47:17 AM »
Ilan ba ang voltage ng supply mo sis?
Sa nakikita ko maliit ang trafo mo, pero depende yan sa voltage. Sa voltage mo makikita ang power ng amp mo, kaya dito ka magsimula kung ilang watts ang amp at dapat tama ang pantapat mong amperage nya.
To attain the true power of your setup, the trafo's power capability should be twice the expected power of the amp based on supply voltage.

28-0-28VAC, maliit nga siya... yung original traffo niyan dating 110v pinaconvert ko sa 220v pero umiinit masyado kaya hindi ko na ginamit, kaya yan nalang muna :)

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Re: P3A amp 100 watts Help
« Reply #324 on: May 05, 2012, 11:47:17 AM »

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #325 on: May 05, 2012, 05:17:52 PM »
mga master ilang watts ang makaya ng 32v 0 32v 6 amperes? wala kasi trafos dito na higher voltage. 32 volts lang center tap at 6 amps available.  :D
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #326 on: May 05, 2012, 11:19:11 PM »
mga master ilang watts ang makaya ng 32v 0 32v 6 amperes? wala kasi trafos dito na higher voltage. 32 volts lang center tap at 6 amps available.  :D

Strange ito lang yung recommended na trafo ng incredible amp ng EE. 35-0-35VAC at 5amps.
8-ohm operation lang kasi ang focus nya.
Di ka na lalayo sa 100watts sa trafo na yan in 8ohms load.
Just have a more robust rectification and filtering. I could justify better performance using 45,000uf caps ( you may ignore this).
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

Offline tony

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Re: P3A amp 100 watts Help
« Reply #327 on: May 06, 2012, 06:51:13 AM »
mga master ilang watts ang makaya ng 32v 0 32v 6 amperes? wala kasi trafos dito na higher voltage. 32 volts lang center tap at 6 amps available.  :D

ilang kilo yang traffo mo?

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #328 on: May 06, 2012, 10:34:08 AM »
nakita ko sa tindahan yung  32 volts  o 32 volts 6 amperes transformer. parang jupiter ang tatak ng trafos.
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline tony

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Re: P3A amp 100 watts Help
« Reply #329 on: May 06, 2012, 05:40:22 PM »
pwede kasing parehong 6amperes pero yung isa 2kgs yung isa naman 5kgs, this tell a lot about the quality of the traffo...

Offline jlester87

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Re: P3A amp 100 watts Help
« Reply #330 on: May 06, 2012, 06:15:17 PM »
Tinanggal ko na yung preamp at ibang functions, sa volume control ko lang ng jvc amp ko kinabit,

Tested on my vintage pioneer speakers, mataba yung tunog nito compared sa lm3875 gainclone at yung highs naging sparkling, ma-bass kahit walang preamp at nag iba yung tunog ng speakers na to... naging tunog mamahalin :)


Offline gorex

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Re: P3A amp 100 watts Help
« Reply #331 on: May 06, 2012, 09:28:07 PM »
sa aking creative zen mp3 player maganda ang match ng p3a ko .  magandang quality din sound card ng creative like audigy at extigy nila dati. kahit derekta connection galing sa headphones to amp. walang preamp.  :D
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #332 on: May 07, 2012, 10:18:50 AM »
Ito sabi ni Elliot designer ng P3A:

""This amp uses the following...

    * long tailed pair input stage
    * single stage bootstrapped Class-A driver
    * complementary compound pair output stage
    * RC Zobel network (it hates inductors)
    * no current mirrors or sources (other than the bootstrap)

It is stable with all conventional loads, capable of 80W into 8 Ohms, and simple to build. Using only commonly available parts, it is also very inexpensive.""  ;)
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline fantom_mayonaise

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Re: P3A amp 100 watts Help
« Reply #333 on: May 07, 2012, 10:37:28 AM »
jlester : pwede na yan pag merong mabubuong amp comparisons. nice!

malapit na magiba computer table mo. lumulundo na hehehe

Offline j a y k e z

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Re: P3A amp 100 watts Help
« Reply #334 on: May 07, 2012, 11:23:30 AM »
@ jlester: ganda tunog nyan pag RnB ;D

Offline Mhavskie

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Re: P3A amp 100 watts Help
« Reply #335 on: May 07, 2012, 12:10:37 PM »
Tinanggal ko na yung preamp at ibang functions, sa volume control ko lang ng jvc amp ko kinabit,

Tested on my vintage pioneer speakers, mataba yung tunog nito compared sa lm3875 gainclone at yung highs naging sparkling, ma-bass kahit walang preamp at nag iba yung tunog ng speakers na to... naging tunog mamahalin :)


ano yung name ng ginamit mong software audio player ?
ΩA Pure And Strong Heart Is An Unstoppable Weapon. Ω

Offline jlester87

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Re: P3A amp 100 watts Help
« Reply #336 on: May 07, 2012, 12:13:31 PM »
jlester : pwede na yan pag merong mabubuong amp comparisons. nice!

malapit na magiba computer table mo. lumulundo na hehehe
lipat ko sa mas maliit na case pag may amp comparison..

crt kasi dati nakapatong diyan kaya lumulundo na haha

Offline jlester87

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Re: P3A amp 100 watts Help
« Reply #337 on: May 07, 2012, 12:14:01 PM »
ano yung name ng ginamit mong software audio player ?
foobar

Offline mund24

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Re: P3A amp 100 watts Help
« Reply #338 on: May 07, 2012, 05:18:54 PM »
try virtual dj pro

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #339 on: May 07, 2012, 05:46:30 PM »
hello mga ka P3A elabers ano kayang hiwaga sa design na ito na amp kasi ang mids niya litaw na litaw kaya ang sound ng guitar buhay na buhay maririnig mo yung pag change fret ng guitarist ng fingers pag slide lalo na sa mga acoustic music. baka dahil sa class A bootstrapped driver combination ng capacitor at resistor? kasi very simple lang ang design sa input stage compare to sakura na me zener pa. at sa vas complimentary pa.taas baba ang trannies.
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Philippine Electronics Forum

Re: P3A amp 100 watts Help
« Reply #339 on: May 07, 2012, 05:46:30 PM »

 

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