Author Topic: Class A amps DIY anyone? (Read 9869 times)

john5479 · « **Reply #30 on:** Jul 19, 2004 at 12:13 PM »

http://www.dddac.de/op06.htm

anyone know where i can buy the mosfets in the project locally??

john5479 · « **Reply #31 on:** Jul 20, 2004 at 03:10 PM »

anyone know where i can get these mosfets? hitachi sk1058 and hitachi sj162, bumped into a nice and simple class a design

JojoD818 · « **Reply #32 on:** Jul 20, 2004 at 07:49 PM »

Quote from: john5479 on Jul 20, 2004 at 03:10 PM

anyone know where i can get these mosfets? hitachi sk1058 and hitachi sj162, bumped into a nice and simple class a design

I'm not sure if these are locally available but I'm sure they are expensive.

Anyway, I haven't read the link yet but the schematic looks promising indeed.

I'll try to find them for you.

john5479 · « **Reply #33 on:** Jul 21, 2004 at 02:26 PM »

Quote from: JojoD818 on Jul 20, 2004 at 07:49 PM

I'm not sure if these are locally available but I'm sure they are expensive.

Anyway, I haven't read the link yet but the schematic looks promising indeed.

I'll try to find them for you.

found a set (2 complementary pairs) and it costs $15 paypal nga lang $:-\$

JojoD818 · « **Reply #34 on:** Jul 21, 2004 at 11:36 PM »

Quote from: john5479 on Jul 21, 2004 at 02:26 PM

found a set (2 complementary pairs) and it costs $15 paypal nga lang $:-\$

I told you they were expensive.

john5479 · « **Reply #35 on:** Jul 22, 2004 at 05:32 AM »

Quote from: JojoD818 on Jul 21, 2004 at 11:36 PM

I told you they were expensive.

ok lang yung price..problema paano makakakuha

JojoD818 · « **Reply #36 on:** Jul 22, 2004 at 09:49 AM »

Quote from: john5479 on Jul 22, 2004 at 05:32 AM

ok lang yung price..problema paano makakakuha

That's another problem on it's own

john5479 · « **Reply #37 on:** Jul 22, 2004 at 10:46 AM »

if i could get these then this thread will become alive again...

JojoD818 · « **Reply #38 on:** Jul 22, 2004 at 12:20 PM »

Quote from: john5479 on Jul 22, 2004 at 10:46 AM

if i could get these then this thread will become alive again...

it is alive, just sleepig though. my JLH Class A project is still on my head.

john5479 · « **Reply #39 on:** Jul 22, 2004 at 06:29 PM »

Quote from: JojoD818 on Jul 22, 2004 at 12:20 PM

it is alive, just sleepig though. my JLH Class A project is still on my head.

are the transistors for the hiraga amp much easier to obtain??

JojoD818 · « **Reply #40 on:** Jul 22, 2004 at 10:06 PM »

Quote from: john5479 on Jul 22, 2004 at 06:29 PM

are the transistors for the hiraga amp much easier to obtain??

both farnell and rs carries them i think. lot's of fake transistors on the local market now. original ones demand pretty steep prices but still cheaper than buying abroad.

JojoD818 · « **Reply #41 on:** Aug 22, 2005 at 12:10 PM »

Quote from: 2ny on Aug 21, 2005 at 02:18 PM

unlike with tubes, solid state amps are more about topology. take the case of the leach amps, they work wonders with different kinds of transistors, i even used 2n3055/mj2955's in one unit i made.

sir tony musta na?

ilan volts ginamit mo supply ng leach amp mo na 3055/2955 opt?

s2kov · « **Reply #42 on:** Aug 22, 2005 at 12:39 PM »

master tony,

ilabas mo na yang LEACH AMP mo!

JojoD818 · « **Reply #43 on:** Aug 22, 2005 at 09:27 PM »

ah ok, mababa naman pala yun supply mo, besides yun sa super version naka series yun mga transistors kaya very safe yun opt mo. last try ko dyan sa super version yun Sanken na 2922/1216 ang ginamit namin ng utol ko, then +/-95V supply.

may bago ka gawa leach amp? o yun dati nasa pic with monster tranny? hindi talaga pwede sa iyo yun mga nabibili sa Raon kasi 30 kilos yata power transformer mo eh.

s2kov · « **Reply #44 on:** Aug 22, 2005 at 11:36 PM »

ala Peter Daniel!

excited na ko jan!

dami na nagtatanong sa diyaudio sa ginagawa mo'ng yan!

Quote from: 2ny on Aug 22, 2005 at 02:29 PM

w8 ka lang, gusto ko mahusay yung chassis at heatsink, hindi ako gagamit ng nabibile sa DEECO! DIY lahat!
Quote

s2kov · « **Reply #45 on:** Aug 23, 2005 at 02:48 PM »

tan tararan!:D;D

5Speed · « **Reply #46 on:** Aug 23, 2005 at 06:31 PM »

ang swabe siguro ang power output nyan...

JojoD818 · « **Reply #47 on:** Aug 24, 2005 at 01:59 PM »

2ny,

yan ba yun pcb ni Jen R?

JojoD818 · « **Reply #48 on:** Aug 24, 2005 at 02:15 PM »

good for you 2ny. my brother can also make that double sided pcb with solder mask and matching stencil but he makes them for mass production, no time to make just a few.

anyway, is there any major change (aside from the choice of transistors) from prof Leach latest version?

good luck!

JojoD818 · « **Reply #49 on:** Aug 24, 2005 at 08:33 PM »

Quote from: 2ny on Aug 24, 2005 at 02:29 PM

i guess the leadwires for the to-3 trannies are gone, since the output trannies solders direct to the pcb, very neat change! i am using mjl1302a and mjl3281a output trannies.

btw, gerber files are available at jen's site. the boards are of 2oz copper, plated thru and is quite thicker than ordinary boards!

that's cool indeed, eliminating 12 wires per channel just for the opt trannies. i've checked the board recently and it seems that aside from the new and neat layout, there is no chage from the original ckt.

one cool layout change that Jen could have included is to position the LTP facing each other and then bonded together for thermal tracking, other than that the board is fantastic.

i have those gerbers a loooong time ago...

rascal101 · « **Reply #50 on:** Oct 27, 2005 at 04:20 PM »

Sir 2ny,

Have you built this amp? If so how does it sound?

Superman · « **Reply #51 on:** Oct 28, 2005 at 08:45 AM »

2ny, enjoy the tubes!

Superman · « **Reply #52 on:** Oct 28, 2005 at 11:14 AM »

OK, will double check with 2GO, thanks!