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Author Topic: op amps question  (Read 854 times)

Offline jackryan

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op amps question
« on: April 12, 2010, 09:16:43 PM »

 Mga masters,  plano ko  gumawa ng 2.1 speaker system with active crossover. Ung mga post dito about crossover/amplifier and the accompanying link ay medyo over na sa kaalaman ko (newbie po). Ung mga datasheets ay nakakalula basahin. So Mga master ask ko lang kung ano ang importanteng spec ng op amps sa paggawa ng mga crossover network? Like bandwidth, pssr and the like.

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op amps question
« on: April 12, 2010, 09:16:43 PM »

Offline jackryan

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Re: op amps question
« Reply #1 on: April 14, 2010, 08:14:22 PM »
anybody?

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Re: op amps question
« Reply #1 on: April 14, 2010, 08:14:22 PM »

Offline insomartin

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Re: op amps question
« Reply #2 on: April 14, 2010, 08:25:23 PM »
yesh...
medyo complicated yung plan mo.
bale kailangan mo nang tatlong opamp
left right and center channel...

try searching for opamp amplifer sa google then post mo dito.
yung madali lang ah. i don't have much experience with opamps but
madaming masters dito sa elab.

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Re: op amps question
« Reply #2 on: April 14, 2010, 08:25:23 PM »

Offline danny

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Re: op amps question
« Reply #3 on: April 15, 2010, 03:44:22 AM »
Mga masters,  plano ko  gumawa ng 2.1 speaker system with active crossover. Ung mga post dito about crossover/amplifier and the accompanying link ay medyo over na sa kaalaman ko (newbie po). Ung mga datasheets ay nakakalula basahin. So Mga master ask ko lang kung ano ang importanteng spec ng op amps sa paggawa ng mga crossover network? Like bandwidth, pssr and the like.

may mga freq controls ba balak mong gawin?
may mga simple akong design na nakita dito noon
nde ko lang mahanap

nga pala ilang watts na amp ba ang ilalagay mo?  :)
danny

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Re: op amps question
« Reply #3 on: April 15, 2010, 03:44:22 AM »

Offline jackryan

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Re: op amps question
« Reply #4 on: April 15, 2010, 06:59:25 AM »
 Salamat sa reply sir martin and sir danny. Ang balak kong gawin ay yung 1875 based na amp from this thread:

http://www.electronicslab.ph/forum/index.php/topic,4224.0.html

and then kung pwede i-pair sya dito:

http://www.electronicslab.ph/forum/index.php/topic,8511.0.html 

kasi parang simple lang ung 1875, regarding dun sa crossover, what i need is the info on the
most important features of an op-amp. Kasi reading the datasheet of the op-amp for the linkwitz-riley network nakakahilo and newbie lang ako.
@ sir danny: yes sir. yung separation ng mga freq pero hindi naman manually i cocontrol. hindi ba sir ung LR network na ang bahala magseparate ng freq? saka ok un sir, kun may mas simple pa dito sa LR network subukan ko.

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Re: op amps question
« Reply #4 on: April 15, 2010, 06:59:25 AM »

Offline danny

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Re: op amps question
« Reply #5 on: April 15, 2010, 12:16:47 PM »
yung lm1875 ni nothing tested na yun
ok yung amp na iyon

but yung crossover, personally nde ko pa na try iyon
so nde ako maka comment, nde ko din alam ang mga specs.
but im sure it should be ok.
nde ko nga lang alam kung ano ang sound quality  :)
danny

Offline danny

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Re: op amps question
« Reply #6 on: April 15, 2010, 12:18:42 PM »
Salamat sa reply sir martin and sir danny. Ang balak kong gawin ay yung 1875 based na amp from this thread:

http://www.electronicslab.ph/forum/index.php/topic,4224.0.html

and then kung pwede i-pair sya dito:

http://www.electronicslab.ph/forum/index.php/topic,8511.0.html 

kasi parang simple lang ung 1875, regarding dun sa crossover, what i need is the info on the
most important features of an op-amp. Kasi reading the datasheet of the op-amp for the linkwitz-riley network nakakahilo and newbie lang ako.
@ sir danny: yes sir. yung separation ng mga freq pero hindi naman manually i cocontrol. hindi ba sir ung LR network na ang bahala magseparate ng freq? saka ok un sir, kun may mas simple pa dito sa LR network subukan ko.

you can build the one doon sa audiohandbook
ikaw na lang mag set ng frequency na gusto.
ok tumunog yung nasa book na iyon, nakagawa na ako.
meron ka bang audiohandbook ng ns?
let me know, pag wala hanapin ko yung schematic na nasa book
danny

Offline jackryan

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Re: op amps question
« Reply #7 on: April 15, 2010, 12:50:27 PM »
sori sir wala ako handbook ng national semi. puro catalogue lang meron ng digikey at mouser, libre kasi. sige sir paki post ung schem. kung meron 2 way and 3 way post mo na din para mapag-aralan. Meron kasi ako op amps, sample, subukan ko  ito pag ka  post ng schem nyo sir. ty sir.

Offline jackryan

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Re: op amps question
« Reply #8 on: April 18, 2010, 07:28:51 PM »
ok, while waitng for the schematic from master danny, meron ako kaunti pang mga tanong. Sa Deeco ba ay may mga capacitor na available para sa crossover schematic na posted above? Pati na din ung mga op amps meron din ba? Kasi sa thread nag LR crossover, sa RS bumili ng caps yung gumawa so ask ko kung available sa Deeco ang mga caps.

Offline danny

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Re: op amps question
« Reply #9 on: April 19, 2010, 09:41:37 AM »
meron mga ordinary capacitors sa raon
at mayroon din naman mga 1% tolerance na resistors
nde ko lang sure kung meron sila nung high quality caps

i have some high quality caps (wima) for sale
wala pang price, kadarating lang kasi nde ko pa na asikaso
i will be start selling some high quality parts for high end audio
 :)
danny

Offline jackryan

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Re: op amps question
« Reply #10 on: April 20, 2010, 06:35:45 PM »

 sir danny nag pm ako sa iyo.

Offline danny

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Re: op amps question
« Reply #11 on: April 20, 2010, 10:15:50 PM »
ok got it
thanks.

email ko sa iyo agad pag nakita ko.
danny

Offline jackryan

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Re: op amps question
« Reply #12 on: April 21, 2010, 04:43:29 PM »
ok sir, sana makita.

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Re: op amps question
« Reply #12 on: April 21, 2010, 04:43:29 PM »

 

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