Hi all,
This is my first approach on class D amp, I'm glad I have found a simple project in which used components I already had. I may put them in good use by constructing this amp, however I am being confused, it seems that the schematic that Norazmi posted was different than the projects of Andrew, rezamir and irvynejay which to my knowledge was being discussed in this thread..😕 and the smps link do not work for non-members (posted by Andrew).
I definitely wanted to construct this project, will someone share the construction files..😉
Thanks & Regards!
This is my first approach on class D amp, I'm glad I have found a simple project in which used components I already had. I may put them in good use by constructing this amp, however I am being confused, it seems that the schematic that Norazmi posted was different than the projects of Andrew, rezamir and irvynejay which to my knowledge was being discussed in this thread..😕 and the smps link do not work for non-members (posted by Andrew).
I definitely wanted to construct this project, will someone share the construction files..😉
Thanks & Regards!
there is no different, Irvy use 2 pcb together and make it stereo. adrew made 1 pcb for mono and maybe he will make new one to have it stereo. rezamir just draw hes own pcb but still use same schema that i`ve posted. as u always make ur own as u wish no problem.
abeteer u can use from original i posted and it should work without problem.
abeteer u can use from original i posted and it should work without problem.
norazmi,
thanks, but I don't see BD139/140 in the schematic there are 4 pairs of MPSA and a couple of BCs, was the pre-driver MPSA replaced by 2Ns? and the combined MPSA/BCs drivers replaced by BDs? Also what are the parts value with DNP indicated...it may be of help on what diameter of torus will I need and how many turns of wire.
I may be asking too much please consider.
Cheers!
😀
thanks, but I don't see BD139/140 in the schematic there are 4 pairs of MPSA and a couple of BCs, was the pre-driver MPSA replaced by 2Ns? and the combined MPSA/BCs drivers replaced by BDs? Also what are the parts value with DNP indicated...it may be of help on what diameter of torus will I need and how many turns of wire.
I may be asking too much please consider.
Cheers!
😀
both work, using bds transistor is the replacement for the current design. and u can replace mpsa with 2n siries. Fot the inductor u need to measure it or u can do with EI33 with 2-3 mm gaps wound it about 14-15 laps awg 18.
thank you norazmi, I'll get back to you later on, in the meantime I will be completing the parts and do the etching job..I did try to dis-assemble one EI33 taken from a discarded PSU, unfortunately the E was split into two parts, it seems that these small ferrite cored transformer is very fragile.
Ciao!
Ciao!
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thank you andrew...I will be checking on that!
by the way how many turns of AWG#18 to come-up with 35uH....did I read it correct?
by the way how many turns of AWG#18 to come-up with 35uH....did I read it correct?
Hi Abeteer
greetings well i dont have this core T106_2 so its hard to tell the amount of turns trying to find t106_2 core norazmi uses this core so he will be able to tell you
warm regards
andrew lebon check DIYSMPS SITE
greetings well i dont have this core T106_2 so its hard to tell the amount of turns trying to find t106_2 core norazmi uses this core so he will be able to tell you
warm regards
andrew lebon check DIYSMPS SITE
i would like to suggest u do 40 turns, estimated inductance will be 22uh and use awg18
NORAZMIS reccomendation of no of turns for T106_2 core
NORAZMIS reccomendation of no of turns for T106_2 core
T106-2 iron powder, u can make 30 uh with 47 turn and +/- 24 vac is good and no problem with that supply. For the EI ferrite core if u want u can dis-arm with boiling hot water about 10-15 mins, it will dis-arm itself or u can use thinner after boiling it.
Thank you guys, that's a lot of help 😉 I will be using T106-2 red core.
Irvyn, nice meter you got there is it a DIY?
Regards!
Irvyn, nice meter you got there is it a DIY?
Regards!
its only diy lc meter its available on the web you just need PICKIT 2 software and hardware to program the PIC 16F XXX ic.
I made monoblok of this amp. it's work on 4 ohm fullrange speaker. i tried to drive sub vdc with 8 ohm configuration, i found that the induktor ringing when the bass come. Supply with 48VDC 7 amp. What must i do?