Hi, Hugh.
This will be a test bed for another circuits in the future, just exchanging output boards.
It replaces the previous board of my first DIY Amp (the wood split in half, was joined only by the transformer 😱).
An externally hosted image should be here but it was not working when we last tested it.
Rgds.
Ta. Might rejig C4 a little to allow for optional cap sizes and back-to back mounting, haven't decided yet.
Al,
Nice work. However, thermal considerations OK, with maybe 30W from each device at full tilt? What sort of heatsink?
cheers,
Hugh
Nice work. However, thermal considerations OK, with maybe 30W from each device at full tilt? What sort of heatsink?
cheers,
Hugh
I agree, I think you can do better with the outputs, the hotter they get the shorter they last.
Yup, I'm sure I could, but these are for a specific heatsink for a specific project, and are unlikely to ever be used at full tilt for long periods of time. Once the PCB is finalised I will be posting the Eagle files up here so others can modify them to suit bigger heatsinks if they so desire.
Al,
The fins are vertical? I keep banging on about the thermals, I'm sorry, but I should factor in the British weather.... here, where temps often get above 40C, it would be, well, marginal!
S-B,
Lovely work. How does it all sound, you are up and running now?
Ciao,
Hugh
The fins are vertical? I keep banging on about the thermals, I'm sorry, but I should factor in the British weather.... here, where temps often get above 40C, it would be, well, marginal!
S-B,
Lovely work. How does it all sound, you are up and running now?
Ciao,
Hugh
Hi, Hugh.
It's Alive!!! 😎
Based on Greg's layout. See also post #482.
http://www.diyaudio.com/forums/solid-state/168554-based-hugh-deans-aksa-55-a-49.html#post2525678
I'm uploading a YouTube video, will post the link soon.
It plays ok, but will yet experiment with Miller Cap, VAS trans (it's an BD139 now), mounted on terminals, and use better speakers than in my laboratory. See the attached picture.
That's the DIY way, I like it, a-ha a-ha...
Last edited:
Very nice, SB, a shame You Tube/Net quality is not up to your system!!
However, it is remarkable we can see and hear a prototype amp at no cost across two very large continents......
Congratulations, nice work,
Hugh
However, it is remarkable we can see and hear a prototype amp at no cost across two very large continents......
Congratulations, nice work,
Hugh
hi Sound_Buster,
I've been on holidays, and have only recently noticed your post.
Congratulations!
Here is a list of things I intend to try one day:
Things to try
Things I have tried and know make a difference is the VAS transistor, the driver transistors and the bootstrap cap.
Also, Hugh posted this schematic and it has a couple of extra components on it that may make a difference.
http://www.diyaudio.com/forums/atta...et-us-see-schematics-forum-aksaconceptual.gif
regards
Hi, Greg.
I did some experiences with C6 and T3 (from conceptual schematic).
I perceived (psychologic, because I was expecting something?) a diferent sound with C6.
Next I exchanged T3. From BD139 to NTE2501. 😱 I know about NTE... But another parts (2SC3503, 2SC3423, etc...) are not so easy around me. NTE2501 is said a replacement to 2SC3503. And I find this NTE on Las Vegas' FRY's during a job trip.
So... It's pleasant, although I can't say how much from C6 or the new T3.
Next experiences to come, exchanging C2 and C4 types. Nowadays, C2 is 220 uF and C1 is 2,2 uF for my bass taste.
The drivers will remain BD139, per layout. See post #482. I think this Baby is a solid base for future projects and variations.
Variations... what about Pinkmouse and his Big Baby?
Rgds.
I did some experiences with C6 and T3 (from conceptual schematic).
I perceived (psychologic, because I was expecting something?) a diferent sound with C6.
Next I exchanged T3. From BD139 to NTE2501. 😱 I know about NTE... But another parts (2SC3503, 2SC3423, etc...) are not so easy around me. NTE2501 is said a replacement to 2SC3503. And I find this NTE on Las Vegas' FRY's during a job trip.
So... It's pleasant, although I can't say how much from C6 or the new T3.
Next experiences to come, exchanging C2 and C4 types. Nowadays, C2 is 220 uF and C1 is 2,2 uF for my bass taste.
The drivers will remain BD139, per layout. See post #482. I think this Baby is a solid base for future projects and variations.
Variations... what about Pinkmouse and his Big Baby?
Rgds.
Last edited:
A good question..well Al, we know you have other priorities but it all looked very ambitious there..anything yet? 🙂