Buy one of these:btw at the end how can i improve it?
Sad news for a hobbyist... Been there...There's a reason stereo makers no longer use junky discrete designs like this any more. They have numerous problems. The bias current doesn't track because the output transistor temp is different. There is no current limit or over temp protection. An integrated device such as above eliminates this and gives excellent reliability.
At least you tried ... Now you know how not to do it ..So, pratically build an amp from scratch... it's a disaster ho well, ICs sucks badly, they push out a max of 100 watt when respecting their condiction and there's no fun!. I have that omnitronic e900 board. A lot of stuffs burn out on that pcb but I knew all the pieces burnt out. I found that at the trash just in front of the home, so i got it, it's been repaired more times and that makes me think... that's why they trashed it, i'll post some pictures tomorrow to see if it can be repaired, cuz i need a powerfull amp (600w or more) for an event and i'm the guy who will sit 8-10 hours in front of a mixer changing cds and enabling microphones.
what if i build a lm3886 amp and replacing the speaker with a final power push pull thing.... pratically the scheme that i did without the 3rd transistor. will it blow? will the 1k resistor limit the epicness?.If you're more interested in designing the whole thing for your amusement, I understand that, but if you're more interested in the end result, you might be able to take an IC like the one linked and use some external transistors to boost the current.
Anything is possible if you want to throw enough time and money at it.I'll post some photos of the amp (inside) and, like you sayd, i'd like to attach a different push pull stage with higher voltages to the output of that amp, pratically that schematic, but with a double power supply, one for the "epic stuff" in the beginning, and one only for the push pull stage. i just want to attach 2 wires on the bases of the amp (working) and using those 2 wires to drive an other push pull stage with higher voltages. I'm trying to make an hybrid of 2 amps. the PylePro PTA1000 and the remanings of the Omnitronic e900 (power supply and push pull stages). is that possible?
YepAnything is possible if you want to throw enough time and money at it.
...And every power stage needs a very fast current limit circuit or else it will just be a fuse waiting to blow up.
Yep... i've experienced that, that amp is a small block of metal with a pcb on a side with 5 transistor touching it, 3 on a side, 2 on the other. 2 of these transistors are the final, what if i put 2 more of them (so totaly of 4) just like the omnitronic and i put 95+- vs on that pcb? (that pcb rns at +-30v) or the thing that i'm says, running the pcb at +- 30v with it's own psu and only the 4 collectors attached to the +-95 v, both psu negative grounded to each other.Yeah, that was the joke..... power stages without some kind of very fast current limit ARE the fuses....
cuz i need a powerfull amp (600w or more) for an event and i'm the guy who will sit 8-10 hours in front of a mixer changing cds and enabling microphones.
yeah, you're right just need an amp, the speakers are already mounted, we have a plan B, i have 2 PA speakers (FBT verve 12) and a bad ass mixer, but those speakers sounds awfull in a closed zone, there are a lot of reflection over the walls, so i want to use the speakers that are mounted there (without an amp ) because are 8 speakers mounted 4 for side spreading the sound better than 2 powerfull one on an angle (not even a side)Here is my advice.
You're the sound guy who has to make everything run smoothly on 15th February without smoking it otherwise you get more than pie in the face.
Building an audio amp from scratch can be fun for the hobbyist. There are lots of circuits for up to 10W audio amps.
There are more circuits that can take you to 100W and beyond.
As a hobbyist you are going to smoke it every time with your kind of expertise and construction practice.
You are going to be hard pressed to meet your goal for 15th February.
Go out and rent a 600W-1000W amp from a sound equipment rental. Cost about $50 for the weekend for mixer, amp, two speakers and a monitor, including all speakers and mic cables.
I know :3 i'll add those power transistor and then increase the PSU, i know that i can't generate power form nothing... There are the holes for two more transistors and their resistors, just need to know how much i can increase the PSU without fuc***g everything..You cannot take a power amp and just add a couple of transistors and resistors and hope to increase the power output.
Power amps do not work like that.
You keep asking the same question but it's one that can't be answered until you actually build it, test it, and dial in the design.I need a powerfull amp for the 15th February. I'm gonna use the Pyle Pro PTA 1000 if i don't make something better. So i want to be sure at 100% that if i add 2 more transistors to the PCB (there are holes for the PTA1400, they uses the same pcb) and attach ONLY to the collectors an other PSU (+- 95v) and all the rest to it's PSU, will work, or will explode?
Exactly.You cannot take a power amp and just add a couple of transistors and resistors and hope to increase the power output.
Power amps do not work like that.
I worked in customer service. When customers used to ask me questions like that, I would carefully explain the facts. If they asked again, I would explain it again. If they kept asking, I would just make up a number for an answer and that would satisfy them or at least make them stop calling my phone.There are the holes for two more transistors and their resistors, just need to know how much i can increase the PSU without fuc***g everything..
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