Aleph 2 schematic kk-pcb
I still owe the schematic for the kk-boards. I hope this helps troubleshoot anyone using the kk-boards.
I still owe the schematic for the kk-boards. I hope this helps troubleshoot anyone using the kk-boards.
http://www.parttimeprojects.com/audio/diy/F5.php
There have been many, many, happy builders of the F5, but, this guy really didn't get on with it.
I've not built one, I'm happy with my Aleph 4.
The F5 is very easy to build and is fairly cheap. The Alephs require a little more expense and attention to detail.
The Alephs raise the output above the 25W of the F5. This comes at a cost of course in Heatsinks and Transformers.
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well. i think this guy is way out there. i bet he had very low or no gain in his preamp.
lack of bass? i have not felt that. my F5 is better than my aleph2's in low frequences 🙂
and regards to the power. it's no problem building it as 200W pr.ch 🙂
exept of heat and money problems 😀
lack of bass? i have not felt that. my F5 is better than my aleph2's in low frequences 🙂
and regards to the power. it's no problem building it as 200W pr.ch 🙂
exept of heat and money problems 😀
Karajak, what are your values over the source resistors? I have 0.556v.
I tried to measure r5 but my probes cant reach it... the bottom of the pcb is mounted, also unreachable... also measure the transistors C to E, as mentioned prior..
Hang in there my friend, don`t give up. We are the Aleph clan.
I tried to measure r5 but my probes cant reach it... the bottom of the pcb is mounted, also unreachable... also measure the transistors C to E, as mentioned prior..
Hang in there my friend, don`t give up. We are the Aleph clan.
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Nrg, thanks.
Karajak, 244mV is low nrg is correct should have .5V.
Now here is my problem I've kinda forgot what we where doing. Sorry I've got a short attntion span.
Let me refresh myself and get back to you with some questions to put me on the same page as you.
But we will get it.
Nrg, how is she sounding?
Karajak, 244mV is low nrg is correct should have .5V.
Now here is my problem I've kinda forgot what we where doing. Sorry I've got a short attntion span.
Let me refresh myself and get back to you with some questions to put me on the same page as you.
But we will get it.
Nrg, how is she sounding?
Nrg, you where talking about the source res for the big fets. I misunderstood.
R5 is also a source res and it also should have 4-5V on it too. 244mV is to low but like I said I need to check where we are. I might of asked KJ to do somthing to cause this.
R5 is also a source res and it also should have 4-5V on it too. 244mV is to low but like I said I need to check where we are. I might of asked KJ to do somthing to cause this.
I still have my amp on the bench, all opened up, so I haven't done much listening. My next task is to drill/tap holes to secure the 244's. I'm waiting for proper tools to arrive. I can't wait to finish it off but it will be a couple more weeks. Thanks for your help with Karajak's build. It's very helpful for me to read it, I'm learning tons of things.
Ahh, the tapping of the sinks. I don't miss that.
Don't forget to countersink the holes just a bit, if you are using the holes in the fets to mount them.
I also recall you using thermal tape correct? You might be better off removing that before drilling and tapping, to prevent stuff ending up under the fets.
The goal is to have a perfectly flat plate that has a perfectly flat fet mounted to it.
100% of the die (the silver plate on the back of the fet) touching the sink.
You use thermal compound, or your sticky tape to fill in the little gaps.
As far as KJ and me helping, I'm learning too.
And like I said, ill do what I can.
Karajak, I'm going to be in a fiberoptic class today (boring) so ill bring my laptop and go over this fourm And make my list of questions.
If anyone else has any sujestions, please pop up.
I have no pride to be hurt. I'm learning too.
Don't forget to countersink the holes just a bit, if you are using the holes in the fets to mount them.
I also recall you using thermal tape correct? You might be better off removing that before drilling and tapping, to prevent stuff ending up under the fets.
The goal is to have a perfectly flat plate that has a perfectly flat fet mounted to it.
100% of the die (the silver plate on the back of the fet) touching the sink.
You use thermal compound, or your sticky tape to fill in the little gaps.
As far as KJ and me helping, I'm learning too.
And like I said, ill do what I can.
Karajak, I'm going to be in a fiberoptic class today (boring) so ill bring my laptop and go over this fourm And make my list of questions.
If anyone else has any sujestions, please pop up.
I have no pride to be hurt. I'm learning too.
You say better in low Fq's, how about the rest?
I've been thinking about a F5.
Your thoughts.... Please?
I get the power diffrence but witch do you enjoy listing to more?
Can you rate them?
Like a overall 1-10 on the aleph
And a 1-10 on F5?
I would be greatful if anyone else has a opnion.
I have aleph 1.2 running paradigm S6's
Should I bother with a semi turbo F5?
Make VERY SURE that the MOS-FETs are mounted tightly against the heatsink and that there is no swarf underneath them. DON'T OVERTIGHTEN the fixing bolts either, as you stand the chance of cracking the MOS-FET.
I lap the holes with a fine file after drilling and tapping to ensure that everything is flat.
If the MOS-FETs aren't closely coupled to the sink they will rapidly fail, similarly any swarf will cause rapid destruction.
Ensure that you use only enough heatsink compound to fill in the gaps between the MOS-FETs and the sink. It is a complete falicy that you need toothpaste sized quantities of the stuff. Too much and you actually end up insulating the devices from their heatsink.
I lap the holes with a fine file after drilling and tapping to ensure that everything is flat.
If the MOS-FETs aren't closely coupled to the sink they will rapidly fail, similarly any swarf will cause rapid destruction.
Ensure that you use only enough heatsink compound to fill in the gaps between the MOS-FETs and the sink. It is a complete falicy that you need toothpaste sized quantities of the stuff. Too much and you actually end up insulating the devices from their heatsink.
thats a little hard to say.
it depend on speakers and rest of the electronics.
i like F5 best on my speakers.
it depend on speakers and rest of the electronics.
i like F5 best on my speakers.
I'm contemplating converting my Aleph 4 into an F5 turbo but I'm waiting on a few reviews to see how the Turbo pans out.
We went for the Aleph 4 in the first instance because my speakers work better with the higher 100W of the 4.
We went for the Aleph 4 in the first instance because my speakers work better with the higher 100W of the 4.
Maybe ill wait too.
Mine play pretty good at 35ish Watts. I went with 1.2's cause my better half can't tell the diffrance between distorted music and the type of music she likes.
Keeps me from having to replace drivers.
Mine play pretty good at 35ish Watts. I went with 1.2's cause my better half can't tell the diffrance between distorted music and the type of music she likes.
Keeps me from having to replace drivers.
It's odd that 10W is normally sufficient to deafen most of us. It's only when we crank the volume up a bit that the smaller amps start to show their limitations.
I'm lucky, I've got an 80 year old neibour who is deaf.
I'm lucky, I've got an 80 year old neibour who is deaf.
We are luck too, we live up at the top of a hill kinda in the woods.
10W, yah, if she didn't jack it up real high.
She's gotta have 80dB in every room. Over the vacume, kids whatever is making noise.
10W, yah, if she didn't jack it up real high.
She's gotta have 80dB in every room. Over the vacume, kids whatever is making noise.
Even 80dB doesn't require enormous amounts of power (at least at 1m).
Beyond that everything goes Square Shaped and the furniture often eats the vibes.
Beyond that everything goes Square Shaped and the furniture often eats the vibes.
KJ, first are you useing the varac? At what setting?
I would like the fallowing please.
Rail Voltages:
+ to G
- to G
+ to -
Output offset:
Acrross speaker posts
Source Vdrop across:
R39
R6
Vdrop across zeener:
D3
Mpsa's Vdrop:
R12
T4 from C to E
Let's start with that.
I would like the fallowing please.
Rail Voltages:
+ to G
- to G
+ to -
Output offset:
Acrross speaker posts
Source Vdrop across:
R39
R6
Vdrop across zeener:
D3
Mpsa's Vdrop:
R12
T4 from C to E
Let's start with that.
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