Author Topic: gainclones diy anyone? (Read 384897 times)

dck22 · « **Reply #1770 on:** Feb 15, 2012 at 06:27 PM »

magandang araw mga sir,

partly napatunog ko na po yung lm3886, kaso merong mga problema.
ang pinag basehan ko po ng diagram ay yung nilabas na schematic ng National Semiconductor.

link: http://diyaudioprojects.com/Chip/LM3886_CA/LM3886_CA.htm

may mga ibang values po akong ginamit kasi walang available dun sa nabilhan ko tulad ng
Rin = 50k 6leg potentiometer ginamit ko
Value ng capacitor, instead of 100uF 50V, 100uF 63V, and mylar lang po yung 0.1uF na ginamit ko
Rz = 2.2ohms 2W lang ginamit ko

base sa schematic sa link yun Cs (capacitor) po ba ay dapat mag parallel ako ng 100uF and 0.1uF?

eto po naging result noong pinatunog ko yun isang channel:

Iphone po yung ginamit kong audio source, noong triny ko na paganahin
nagbabago ang volume ng iphone, at tumitigil sa pag play ng kanta.

kapag mahina at walang vocals at malakas na bass yung kanta, ok naman yung pag play
kaso kapag may vocals na, nagbabago na yung volume ng iphone.

ano po kayang problema nito? maraming salamat po..

markcrenz · « **Reply #1771 on:** Feb 15, 2012 at 10:55 PM »

Quote from: dck22 on Feb 15, 2012 at 06:27 PM

eto po naging result noong pinatunog ko yun isang channel:

Iphone po yung ginamit kong audio source, noong triny ko na paganahin
nagbabago ang volume ng iphone, at tumitigil sa pag play ng kanta.

parang delikadong masira iphone mo dyan. yung amp input baka may voltage. dapat wala. check for possible shorts between pins. recheck mo amp circuit.

JojoD818 · « **Reply #1772 on:** Feb 16, 2012 at 04:14 PM »

Quote from: markcrenz on Feb 15, 2012 at 10:55 PM

parang delikadong masira iphone mo dyan. yung amp input baka may voltage. dapat wala. check for possible shorts between pins. recheck mo amp circuit.

+1, input offset currents yan...

ATJr. · « **Reply #1773 on:** Feb 16, 2012 at 05:05 PM »

lagyan mo ng capacitor sa top ng volume control.......4.7ufd/50 volts....

dck22 · « **Reply #1774 on:** Feb 19, 2012 at 07:54 AM »

chineck ko sir yung input wala namang voltage 0V,
then yung pin 1 = 35V
pin 4 = 35V rin

nung nilagyan ko naman ng capacitor sa input, humina yung sound pero same problem pa rin..

markcrenz · « **Reply #1775 on:** Feb 19, 2012 at 08:36 AM »

-35 dapat sa pin 4

dck22 · « **Reply #1776 on:** Feb 19, 2012 at 08:44 AM »

Quote from: markcrenz on Feb 19, 2012 at 08:36 AM

-35 dapat sa pin 4

sorry, -35V nga po sa pin 4..

dck22 · « **Reply #1777 on:** Feb 19, 2012 at 05:17 PM »

ok na mga sir, maraming salamat po sa mga tumulong..

kasalanan pala nung ginamit kong y cable (RCA to 3.5mm jack)
yung ginamit ko e yung may video, nung ginamitan ko ng red and white lang to 3.5mm
ayun solve ang problema hehehe..

malakas nga hehe, isang channel pa lang ginagamit ko, nasira ko kasi yung isang LM3886TF

ATJr. · « **Reply #1778 on:** Feb 19, 2012 at 06:05 PM »

we all learn from mistakes, kasama yan......

dck22 · « **Reply #1779 on:** Feb 19, 2012 at 06:32 PM »

Quote from: TonyT on Feb 19, 2012 at 06:05 PM

we all learn from mistakes, kasama yan......

oo nga sir, pero worth it naman kapag napagana na ng maayos hehe..
maraming salamat po..

dck22 · « **Reply #1780 on:** Feb 26, 2012 at 11:53 AM »

patulong uli mga sir,

sa tuwing ikakabit ko yung 2nd channel ng LM3886 palaging pumuputok,
e parehong pareho naman ng orientation ng components yung ginawa ko,
yung isang channel ok naman.

ang ginawa ko sa power supply ini-split ko sa dalawa yung V+ V- GND.

JojoD818 · « **Reply #1781 on:** Feb 27, 2012 at 10:21 AM »

paki describe/drawing mo yun power supply mo para maintindihan namin at makita kung saan ang mali...

ATJr. · « **Reply #1782 on:** Mar 09, 2012 at 09:56 AM »

this is my LM4702A board awaiting installation:

vimikay · « **Reply #1783 on:** Mar 29, 2012 at 05:41 PM »

Mga Sirs,
Napaandar ko na pala yung LM1875 stereo at maganda ang tunog. Thanks a lot sa inyo.
Ginawa ko rin yung LM3875 stereo din at mas lalong maganda ang tunog at first time lang ay tumunog
na agad sila kaya gumawa agad ako nang mga kaparis. Thanks a lot mga Sirs.

1.0 May tanong lang po ako. Kapansin pansin pala na yung left and right channel sa LM1875 at pareho din sa LM3875 ay malakas ang isa at mahina ang isa na channel. Ganito ba talaga ito? Separate ang PS ang ginawa ko. Ano palang magandang gawin dito para mag balance.
2.0 Pag power start at pag power off pala ay may sound na malakas (thog). Ano palang gawin ko para maalis ang malakas na sound.

Again mga Sirs, Thanks a lot.

blackmoly · « **Reply #1784 on:** Mar 30, 2012 at 08:48 AM »

gumamit ka ba ng stereo potentiometer sir? dapat same vol lang yan since same resistor values naman gamit mo on both. If may vol pot i suggest bili ka magandang klase like alps.

check mo sir wiring layout, solder points at grounding. wala naman ako ne encounter na pop up noise sa gc ko pag power off. i'm using lm3875 also.

ATJr. · « **Reply #1785 on:** Mar 30, 2012 at 10:30 AM »

vimikay, anong circuit yan? pwede ka gumamit ng speaker protector/time delay relay...

Zexadron · « **Reply #1786 on:** Apr 08, 2012 at 07:33 PM »

Saan ba puwede maka bili ng LM 3875 kasi walang stocks sa Raon. Sa Alexan wala din stocks.thanks

efren_ · « **Reply #1787 on:** Apr 15, 2012 at 08:46 PM »

here is the LM3886T gc with 2 6N23P tubes as front end inside a Sakura AV3310 chassis

"oldskool" point to point wiring for the gc chips

modern approach for the tubes using PCB

regulator block for the chips' +/-33Vdc

now inside the mutilated Sakura

common mode choke for the tube's supply rails

the LM3886T gc chips & 6n23P tubes thru the kindness of sir TonyT.
the circuit design is from Joe Rasmussen's site, an inverted Thorsten-Loesch circuit.

unfinished as of the moment, still working on the makeover of the front panel

jlester87 · « **Reply #1788 on:** Aug 04, 2013 at 07:02 PM »

Another chipamp in the making. I created my own PCB layout, the schematic is based on Mauro Penasa's design which is highly regarded in DIYAudio. I uploaded the layout files here just in case you want to build one.

rochie · « **Reply #1789 on:** Aug 05, 2013 at 02:24 PM »

my LM1875 gainclone

vhinx · « **Reply #1790 on:** Aug 05, 2013 at 11:43 PM »

Quote from: rochie on Aug 05, 2013 at 02:24 PM

my LM1875 gainclone

Hmmm, how's the sounds bro?

rochie · « **Reply #1791 on:** Aug 06, 2013 at 11:38 AM »

Quote from: vhinx on Aug 05, 2013 at 11:43 PM

Hmmm, how's the sounds bro?

hehehe tambay muna kt88 ko bro,swak na swak sa proac 1sc clone ko.ang masaya dito pwede i tweak to your liking,pwede taasan ang gain kung ang source mo ay yung mga ipod/pmp lang pwede din lagyan ng volume pots para kahit wala na preamp at higit sa lahat ehh hindi masakit sa bulsa hehehe

fentom · « **Reply #1792 on:** Aug 06, 2013 at 11:56 AM »

Wow buo na sir? Magkano inabot po?

fishda · « **Reply #1793 on:** Aug 06, 2013 at 09:37 PM »

how much po ba ang budget for a gain clone amp?

ATJr. · « **Reply #1794 on:** Aug 07, 2013 at 06:30 AM »

the power traffo will set you back about 1000, the chips at 350(you can ask for free samples from TI), caps and parts another 500 or so...but the caveat here is that you do it yourself.....

btw, this thread is 10 years old......

rochie · « **Reply #1795 on:** Aug 07, 2013 at 05:14 PM »

Quote from: ATJr. on Aug 07, 2013 at 06:30 AM

the power traffo will set you back about 1000, the chips at 350(you can ask for free samples from TI), caps and parts another 500 or so...but the caveat here is that you do it yourself.....

btw, this thread is 10 years old......

that's where the fun begins sir Tony,natuwa ako na yung unang diy project ko tumunog on my first try at walang umusok or something hehehe,pero i follow every safety steps na nirerecommend ng mga taga diyaudio like checking dc offset before connecting the speaker and checking the voltage etc etc.

ATJr. · « **Reply #1796 on:** Aug 07, 2013 at 06:53 PM »

dc offset should not be more than +-100mV, otherwise yung speakers mo sobrang offset din mechanically...

jlester87 · « **Reply #1797 on:** Aug 07, 2013 at 07:13 PM »

don't forget the speaker protect.. mahirap na baka matusta ang speaker if anything happens to your amp

rochie · « **Reply #1798 on:** Aug 08, 2013 at 11:19 PM »

Quote from: JLesterP on Aug 07, 2013 at 07:13 PM

don't forget the speaker protect.. mahirap na baka matusta ang speaker if anything happens to your amp

I put zobel network, pero lagyan ko pa din ng separate speaker protection para panigurado talaga.

fishda · « **Reply #1799 on:** Aug 10, 2013 at 02:30 AM »

anyone from commonwealth who can let me audition a gainclone? am really interested to hear the sound of this amp:)