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Author Topic: Proposed Dual Bridge PSU  (Read 579 times)

Offline abeTIR

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Proposed Dual Bridge PSU
« on: February 17, 2012, 08:02:03 AM »


just pop this in dito na lang since gamit pang-audio..nalilito ako kay search e'.... ;D
Am I doing this right audio folks? Has anyone of you gumagamit ng similar circuit? I was reminded kase nung advice ni Dr. Bora to use dual rectifiers per block. Pero alam ko using two traffos or a single traffo with dual secondaries of the same voltage nagagawa ito....but in the case of a center tap traffo pupuede rin ba ito... ;D

The object was to rectify both -/+ rails mas maganda raw ito for power amps.

(na-miss ko ata sa schema yung bleeder resistors)
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Proposed Dual Bridge PSU
« on: February 17, 2012, 08:02:03 AM »

Offline BhongTech

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Re: Proposed Dual Bridge PSU
« Reply #1 on: February 17, 2012, 08:12:44 AM »
ang ni rectify mo ay mismong kabuuhan ng secondary output,dapat bawat half ng secondary output at yung center tap ang gamitin sa magkabilaang (sa isang side ac input ng bawat)bridge diode at hindi ang magkabilaang dulo ng secondary output.
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Re: Proposed Dual Bridge PSU
« Reply #1 on: February 17, 2012, 08:12:44 AM »

Offline Gwenda

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Re: Proposed Dual Bridge PSU
« Reply #2 on: February 17, 2012, 08:18:08 AM »
Remove one rectifier bridge, you don't need it.  It's already rated for 35A.  The input of the bridge (~ or AC) goes to the outside taps of the trafo, the (-) of the brigde goes to the -Vcc.  Center tap of the trafo is the GND.  But if your purpose is to parallel the bridges, that's OK, mali lang ata connection ng diodes.  Dapat (+) to (+), (-) to (-).

Hindi dapat naka-series yung 104 cap sa 100uF cap.
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Re: Proposed Dual Bridge PSU
« Reply #2 on: February 17, 2012, 08:18:08 AM »

Offline j a y k e z

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Re: Proposed Dual Bridge PSU
« Reply #3 on: February 17, 2012, 08:20:07 AM »
para saan po ung 4 na cap sa dulo?
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Re: Proposed Dual Bridge PSU
« Reply #3 on: February 17, 2012, 08:20:07 AM »

Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #4 on: February 17, 2012, 08:29:09 AM »
^caps acts as freq/impedance filters because the main filter caps is a whopping 40000uf total



Quote from: Bhongtech on February 17, 2012, 08:12:44 AM
ang ni rectify mo ay mismong kabuuhan ng secondary output,dapat bawat half ng secondary output at yung center tap ang gamitin sa magkabilaang (sa isang side ac input ng bawat)bridge diode at hindi ang magkabilaang dulo ng secondary output.

hmm..mukhang tama na ata yung unang draft ko..



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Re: Proposed Dual Bridge PSU
« Reply #4 on: February 17, 2012, 08:29:09 AM »

Offline Gwenda

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Re: Proposed Dual Bridge PSU
« Reply #5 on: February 17, 2012, 08:31:09 AM »
Yung 100uF & 104 (0.1uF) caps are used to filter out high freq noise.  Usually placed very near the output terminals.
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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #6 on: February 17, 2012, 08:31:36 AM »
Quote from: Gwenda on February 17, 2012, 08:18:08 AM
Hindi dapat naka-series yung 104 cap sa 100uF cap.

yup correct nagkamali po ako sis...naka parallel yan.. ;D
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Offline BhongTech

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Re: Proposed Dual Bridge PSU
« Reply #7 on: February 17, 2012, 08:38:36 AM »
Quote
hmm..mukhang tama na ata yung unang draft ko..
yung sa schema mo kasi naka series na ang bridge diode mo at ang gitna nun ay para sa ground eh bakit merun pa po na center tap para din sa ground?
ito po yung iniisip ko kung ok nga. ;D
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Offline DJFEL

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Re: Proposed Dual Bridge PSU
« Reply #8 on: February 17, 2012, 08:57:49 AM »
abang sa apdit..
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Offline Johannah Aleksandria

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Re: Proposed Dual Bridge PSU
« Reply #9 on: February 17, 2012, 08:58:39 AM »
Quote from: Bhongtech on February 17, 2012, 08:38:36 AM
yung sa schema mo kasi naka series na ang bridge diode mo at ang gitna nun ay para sa ground eh bakit merun pa po na center tap para din sa ground?
ito po yung iniisip ko kung ok nga. ;D


Mas mganda ang ganito.
Ito yung recommended ng PASS Lab.
Individual yung rectification, tapos pinag-series.
Yung unang schema ay naka-parallel yung dalawang bridged diode, pero gagana din. Pero kung sa benefit, ay wala ng maibigay na kakaiba kumpara sa isang bridged.
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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #10 on: February 17, 2012, 09:03:02 AM »
^ganyan nga dapat mga sis, angkaso pang dual secondaries nga lang, I've been thinking for a possible way gamit center tap na traffo....
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Offline BhongTech

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Re: Proposed Dual Bridge PSU
« Reply #11 on: February 17, 2012, 09:25:40 AM »
parang ganito yata kaso diko sure kung pe pwede ito,sensya na hand writing lang po. ;D

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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #12 on: February 17, 2012, 10:01:52 AM »
^oki din yan sis, endi na nga lang per rail ang rectification..ok yan per block... ;)
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Offline ultrasonic™

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Re: Proposed Dual Bridge PSU
« Reply #13 on: February 17, 2012, 11:26:38 AM »


pa abang... at pa ub na rin
 Go  TS

naka antabay na ang Fire Extinguisher  ;D
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Offline Johannah Aleksandria

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Re: Proposed Dual Bridge PSU
« Reply #14 on: February 17, 2012, 11:55:27 AM »
Quote from: abeTEER on February 17, 2012, 09:03:02 AM
^ganyan nga dapat mga sis, angkaso pang dual secondaries nga lang, I've been thinking for a possible way gamit center tap na traffo....

Ok lang nman kahit na center-tap, wala nmang kaibahan sa pinaghiwalay na winding dahil pinagsama mo rin nman.
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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #15 on: February 17, 2012, 12:27:00 PM »
http://www.tnt-audio.com/clinica/ssps2_e.html

the idea originated from here...

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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #16 on: February 17, 2012, 12:50:35 PM »
and from this one...


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Offline Johannah Aleksandria

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Re: Proposed Dual Bridge PSU
« Reply #17 on: February 17, 2012, 03:00:40 PM »
Napakarami nman tlagang paraan eh, the only first thing you must know is the principle.
Lahat nyan ay pwedeng gamitin, mali nga lang ang schema nung output ng huli. ;D ;D
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Offline Tukkar

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Re: Proposed Dual Bridge PSU
« Reply #18 on: February 17, 2012, 04:16:40 PM »
Kung marami kang bridge rectifiers pwede mo gawin 2, pero kahit isa lang for ctap pareho lang ang outcome.,.full wave bridge pa rin and same principles apply for ripple. Capacitor banks are essential in regulating the ripples. too much capacitance will cause in rush currents so be sure to have slow turn on ckt and add snubber.
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Offline abeTIR

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Re: Proposed Dual Bridge PSU
« Reply #19 on: February 17, 2012, 09:02:19 PM »
thanks sis,

from the mains meron akong softstart, iniisip ko rin kung kaya pa maka-insert ng snubber kagaya neto..






Quote from: Johannah Aleksandria on February 17, 2012, 03:00:40 PM
Napakarami nman tlagang paraan eh, the only first thing you must know is the principle.
Lahat nyan ay pwedeng gamitin, mali nga lang ang schema nung output ng huli. ;D ;D

tama ka diyan sis, hinugot ko sa DIYAudio yung image na-correct na ata nila ito dun... ;D
simple lang naman objective ko dito makagawa ng PSU na when the amp requires more power kaya itong maibigay kagad ng PSU without stressing the traffo..base sa mga nababasa ko ganyang circuit ang recommended ng mga audio fanatics.




ganito ang gusto ko rin gawin endi lang pinakita kung pano naka-tap sa traffo...lumalabas limited lang siguro mga piyesa maikakabit ko since walang PCB, ito bleeder resistor lang naidagdag.


mahirap din kase ang gaya-gaya..ahehe ;D


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"The choice is in the eye of the beholder and in the ear of the listener"
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Re: Proposed Dual Bridge PSU
« Reply #19 on: February 17, 2012, 09:02:19 PM »
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