2009-05-01T03:23:00.000-07:00

In the end ı finished my gainclone project.First test stages are lead to a good result.I can specify this project best one which doing until now.Actually ıf we compared this project with the other ones,ıt will be inequity.Glassy sound,acustic performance are very cool.In addition ı didn't listen with a hifi speakers and source.The design of buffered section is belonging Pedja Rogic and general design belonging Drhardware.

There are two amplifier pcb,one pcs. natural point pcb,regulator,toroidal transformer and main reservoir capacitors.Now we begin power input then continue about regulator,amplifier.Our transformer brand is multicomp and 2x30V output.The power is 300VA.The main reservoir condansators which we use to rectifier output voltage are made in china.Bridge diodes capacity are about 10A.Our 30V which to pass through from rectifier then get up 44V (30x1.48=44) .44V is coming to our regulator section.

we use lm338 to get 30V however we use lm317 and lm337 to get 15V.you can use lt1083 instead of lm338.only different is lt1083 allow 5A limit.wheras lm338 allow max 3A.but ıts not problem our project you can use lm338.also lt1083 price is high.you can forget its.the another important thing is you have to mount on a heatsink.maybe you can do same thing it will be behoof for lm317 and 337.but it can be small onboard part.the all 10mf which we use on regulator critical parts it must be low esr.for 100 m doesn't matter.you can set the lm3875 voltage from 10K trimpots.the wire which between of regulator pcb and amplifier pcb must be minimum lenght...to be continued with amplifier comments...this's our regulator circuits and another photos :

The pcb design by drhardware..

Amplifier pcb..

So we can keep on with amplifier parts.I used lm3875 chips.ı made a simple order from national semiconductor.ıt's keypoint! ıf you dont sure chip which sell about fake or orjınal you will make an order from N.S.They are most important parts in the project.ı'm very grateful to drhardware (dxvideo) for his effort and calculates.
The electronic parts which we use are :
1 - panasonic fm 1500mf : This is resarvuar capacitors near the input power.it's another very important parts.they must be definitely low esr capacitors.ı choose panasonic fm series.the capacitance must be choose 2200mf-1000mf .
2- bypass capacitors 100nf : I choosed panasonic polypropylene %5 tolerance.
3- 2sk170 jfets : our buffer parts are 2sk170.this very critical point is : they have to be orjinal parts.because they compose to buffer our signal input .ıf they fake this project will be cancel.And ıdss current must be between 12mA-6mA.this is pedja rogic advise.He say this distance have best sound.
4- Mundorf mcap 4.7mf : mcaps on the signal track.their quality flexible between 3000$ and 0.3$ :) this is very long story..ı bought that from germany.
5- Audience Auricap 1mf : Auri caps are medium quality capacitors which ı bought from USA.you can use wima series caps.but definitely must be polypropylen.
6- 100mf Elna silmic ll : our 100 mf capacitors must be high quality or low esr.ı used elna silmic ll.a lot of diy people say this capacitors and series are very good.

to be continue...

Diyaudio Platform