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Author Topic: Sakura Amp Modification  (Read 8026 times)

Offline eesbiboi

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Re: Sakura Amp Modification
« Reply #180 on: September 08, 2011, 10:50:43 AM »
^what if sir tony i'd use the amp for PA???...
ano kaibahan nun higher VAS supply than output, kesah same or single rail supply???...

ees
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Re: Sakura Amp Modification
« Reply #180 on: September 08, 2011, 10:50:43 AM »

Offline tony

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Re: Sakura Amp Modification
« Reply #181 on: September 08, 2011, 10:55:59 AM »
the output stage will saturate of clip ahead of the VAS....if you are not letting your amp clip then this is unimportant....
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Re: Sakura Amp Modification
« Reply #181 on: September 08, 2011, 10:55:59 AM »

Offline eesbiboi

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Re: Sakura Amp Modification
« Reply #182 on: September 08, 2011, 11:00:05 AM »
^ahhh i see na sir tony why its not really that important with PA's...
ano nmn sir tony effect if vas is higher than the output when it comes to power/audio???...

sir tony, pwede ko po ba eplace yung diode say 1n4007 in place of the 10R resistor???...

regards
ees...
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Re: Sakura Amp Modification
« Reply #182 on: September 08, 2011, 11:00:05 AM »

Offline tony

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Re: Sakura Amp Modification
« Reply #183 on: September 08, 2011, 12:34:00 PM »
Quote from: eesbiboi on September 08, 2011, 11:00:05 AM
^ahhh i see na sir tony why its not really that important with PA's...
ano nmn sir tony effect if vas is higher than the output when it comes to power/audio???...

sir tony, pwede ko po ba eplace yung diode say 1n4007 in place of the 10R resistor???...

regards
ees...

for audio.....i see that technique used in a lot of japanese amps....if it were me i'd regulate the front-end instead...

in some mosfet power amps, VAS has higher rails due the Vgth of the output mosfets used.....

skyjam used that diode in his amp, you can also ask him....
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Re: Sakura Amp Modification
« Reply #183 on: September 08, 2011, 12:34:00 PM »

Offline nick...j

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Re: Sakura Amp Modification
« Reply #184 on: September 16, 2011, 10:31:22 PM »
my n22han ako ah thankz e lab at sa mga master..
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Re: Sakura Amp Modification
« Reply #184 on: September 16, 2011, 10:31:22 PM »

Offline mund24

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Re: Sakura Amp Modification
« Reply #185 on: April 14, 2012, 01:15:24 AM »
buhayin ang thread dami matutunan :)
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Offline kaiky14

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Re: Sakura Amp Modification
« Reply #186 on: May 05, 2012, 07:17:36 AM »
ganda magbasa basa dito. hehe
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Offline jeproks69

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Re: Sakura Amp Modification
« Reply #187 on: June 16, 2012, 01:37:39 PM »
Mga sakura masters paano i modify, ito kasing volume control konting pihit lang malakas agad ang volume wala pa sa 1/4 ang lakas na ng sound output. paano ba operahan ito? saan circuit puwede baguhin.
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Offline Disabled

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Re: Sakura Amp Modification
« Reply #188 on: June 16, 2012, 01:39:42 PM »
^ modify ung feedback resistor sa ampli (sa akin lang)
or sa OP-AMP
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Offline jeproks69

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Re: Sakura Amp Modification
« Reply #189 on: June 16, 2012, 01:48:00 PM »
thanks master ryu plus 1. feedback value ng sakura av5023, 39k at 1 k. so ano kayang puwedeng match na value?

sa op amp sa may preamp titingnan ko muna ang value.ty^
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Offline Disabled

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Re: Sakura Amp Modification
« Reply #190 on: June 16, 2012, 01:50:34 PM »
pde mo paglaruin yan , mga 22k at 1k will give about  a gain of 22.
sa opamp ganun din.
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Offline jeproks69

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Re: Sakura Amp Modification
« Reply #191 on: June 16, 2012, 01:59:21 PM »
ok pre ;)
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Offline Johannah Aleksandria

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Re: Sakura Amp Modification
« Reply #192 on: June 16, 2012, 02:25:58 PM »
Quote from: jeproks69 on June 16, 2012, 01:37:39 PM
Mga sakura masters paano i modify, ito kasing volume control konting pihit lang malakas agad ang volume wala pa sa 1/4 ang lakas na ng sound output. paano ba operahan ito? saan circuit puwede baguhin.

Baka nman anliit ng value ng volume control mo, palitan mo ng mataas, 100k.
Lagyan mo ng resistor divider sa input, baka malakas na kasi source mo. 10k to input then 10k to ground.
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Offline jeproks69

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Re: Sakura Amp Modification
« Reply #193 on: June 16, 2012, 02:37:16 PM »
wala pa sa 1/4 volume lakas na ng sound output. itry ko rin yung suggestions niyo.thanks plus 1.
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Offline Wolfdale

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Re: Sakura Amp Modification
« Reply #194 on: June 16, 2012, 06:00:03 PM »
interested kasi ako gumawa nito!
meron po ba pcb layout with their parts?
pengi poh!
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Offline tony

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Re: Sakura Amp Modification
« Reply #195 on: June 16, 2012, 07:23:21 PM »
Quote from: jeproks69 on June 16, 2012, 02:37:16 PM
wala pa sa 1/4 volume lakas na ng sound output. itry ko rin yung suggestions niyo.thanks plus 1.

gumamit ka ng Audio taper or logarithmic na volume control....kung wala ngang mahanap pwede ito...http://geofex.com/Article_Folders/potsecrets/potscret.htm
http://www.jt30.com/jt30page/potfix/
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Offline 01110011

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Re: Sakura Amp Modification
« Reply #196 on: June 16, 2012, 09:06:53 PM »
pa abang sa thread na2 :D
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Offline gancua68

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Re: Sakura Amp Modification
« Reply #197 on: July 18, 2012, 09:45:29 AM »
ako  din. basa basa lng muna ako.
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Philippine Electronics Forum

Re: Sakura Amp Modification
« Reply #197 on: July 18, 2012, 09:45:29 AM »
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