Coma,
are you aware of the difference between AC voltage and DC voltage.
It looks like post300 is referring to DC voltage: Is "this amp is suitable for 4ohms"?
Yes, with 60-30-0-30-60v dc rail voltage.
and
post301 is referring to AC voltage: "I have 48-24-0-24-48 Transformer"
are you aware of the difference between AC voltage and DC voltage.
It looks like post300 is referring to DC voltage: Is "this amp is suitable for 4ohms"?
Yes, with 60-30-0-30-60v dc rail voltage.
and
post301 is referring to AC voltage: "I have 48-24-0-24-48 Transformer"
Hi apexaudio I want Clasic 120W RMS 8E amplifier. I have 30-0-30 5A transformer is it OK for 120 watts to 8E load I wanted parts list and can i use same pcb that you mention A100 please help if you required my emailid is sanbadgujar@gmail.com http://www.diyaudio.com/forums/members/apexaudio.html
For 120W at 8E you need transformer 45-0-45 vac and you can use amp from this thread with 2 output pairs IRFP240/IRFP9240.
Hi Aperaudio thanks for help i have one dought in your #122 post from photo of circuit F100 i fell
nearly many registrar watts size is 1W can you mention all registrar watts size please thanks
nearly many registrar watts size is 1W can you mention all registrar watts size please thanks
Hi Mile,
I already fixed the problem when I use IRFP240/9240 to instead IRF640/9640,
the sound is good and very low distortion but the bass not really enough even I used 100uf for C6, the sound still thin if compare with AX14, but the high to middle range on F100 is better.
The DC rail voltage is +/-44 now.
Any suggestion to improve the sound more thickness.
Thanks a lot.
Ben
Mr. Mile can i use IRFP240 & IRFP9240 for driver and how much bias for 5 pairs final.... sorry for my bad english
if anyone has some time...
i have done a pcb for FB400,i haven´t checked it yet so if anyone has time and wants i would be gratefull to him,specially if he would point me for possible mistakes done. input is done so there can be used all electrolit capacitors with belonging resistors (C1,C2,R1,R2) or without them using only one big capacitor like wima 4,7uF or similar. here are the pdf,jpg and lay (SPRINT) files:
i have done a pcb for FB400,i haven´t checked it yet so if anyone has time and wants i would be gratefull to him,specially if he would point me for possible mistakes done. input is done so there can be used all electrolit capacitors with belonging resistors (C1,C2,R1,R2) or without them using only one big capacitor like wima 4,7uF or similar. here are the pdf,jpg and lay (SPRINT) files:
Attachments
Last edited:
thanks for suggestion Mile,wich protection do you suggest,and on what resistor should it "sense",the 2r2 sors or 0,32r emiter resistor?
when i get some more time i will try to do it. i have a plan to draw another one like this,just with two pairs of bipolar transistors because i do not need all 400W of power,and i guess that even with two pairs of bipolars this amplifier would easy reach about 150-200W of power at 4R load.
one more thing- i have read that bias sgould be around 200mA (measured at source resistor) but what voltage supply should be used with FB400 with all five output pairs,and what voltage would be suggested for two pairs of bipolar transistors at the output?
sorry for a lot of questions,but i would really like to hear that someone has built this amplifier and his impressions about it. that is why i did pcb for it,and will do a few more...