Hi,
I’m looking at combining the pre-amp kit K8084 with the K8060 200W Power Amp to use as an amp for guitar. Is the below drawing correct and can it be done this way ?
Any input is apreciated.
Cheers
Jack
Shoud be OK, however, I would not interrupt the speaker output.
The problem is that many of the cabs have different connectors, I guess I can put in speakon on the amp and have 2 different cables!
Is splitting the mains cable to send current to both transformers ok?
Splitting the mains is fine, however, make sure that the fuse also protects the pre-amp transformer.
Excellent.
Just another thought, I want to mount all of this in an enclosure with the aim to have the amp section in the back and pre in the front, is it ok to mount the heatsink outside the enclosure vertically with the pcb staying inside? I’m probably going to put 1 or 2 additional fans together with one of your temperature sensors so they go on if the temp inside the enclosure is let’s say +35C!
If the heatsink is on the outside, a fan is not required.
Leave the PCB mounted on the heatsink, do not mount the power transistors away from the board.
The PCB will stay on the heatsink, it’s just the case of mounting the ribs of the heatsink outside with everythin else inside!
One more thought: no need for the extra volume pot. The preamp already has one…
Jack, let us know what it sounds like.
also,
Would this combination of amps be ok inside an enclosure?
No problem to put both in an enclosure.
Hey, I built this same set-up as shown up-top (and i fused the 2nd transistor) but when i plug it in all I get is a heavy loud buzz from my speaker.
Also, My speaker might support around 75W, what can i do to make sure only 75W is sent to my speaker?
You ‘fused the 2nd transistor’ ???
Please elaborate…
You can use a slightly lower supply voltage to reduce the output power (e.g. 2 x 24VAC).
Sorry, What I meant is fused the 2nd transformer. The one which supplies 12-0-12 to the pre-amp.
So the situation is that i have wired up as the diagram shows (i didn’t add a volume adjuster between the 2 boards since you said it wasn’t necessary, and I have a speaker instead of a line-out.). I put down the potentiometers down to 0 so that i can gradually raise the volume, I plug in my guitar. when i plug the mains in to give it power, both LED’s turn on and the speaker just makes a really really loud buzzing. I dont understand why it does it and would like to know if anybody knows what I should do.
Do either of the 2 chips need to be earthed to the casing? If so, which and where do i earth?
No, do NOT ground any of the parts.
You say not to earth either parts, I want to double check, since the K8084 shows that one of the 4 corners will earth itself to the cashing through spacers. Is this correct? Would a lack of this earthing make the speaker buzz loudly?
[color=#FF0000] when i plug the mains in to give it power, both LED’s turn on and the speaker just makes a really really loud buzzing.[/color]
hello, i had the same problem.
the error came from a bad solderd amp input connection(i connected it with a female rca plug.
[quote=“ruffneckrulez”][color=#FF0000] when i plug the mains in to give it power, both LED’s turn on and the speaker just makes a really really loud buzzing.[/color]
hello, i had the same problem.
the error came from a bad solderd amp input connection(i connected it with a female rca plug.[/quote]
Hey Thanks for the reply.
So what should I redo? i basically have the RCA plugs going into the preamp (since it comes with RCA connectors) and i cut the cable to then solder the wires to the power amp. What should i do to stop the buzz?
my plan is to remove the RCA plugs going into the preamp,and the little ““input pins””.
and replace at all with just 1 cable from board to board.
I am still waiting for a reply on this plan.
P.S. sorry for my poor english.
my dutch is much better 
does it work now?