As a new bod I'm sure my offering will not match up to the others on this thread, but hey, who cares? This links to my first post where the images are...
http://www.diyaudio.com/forums/showthread.php?s=&postid=1205011#post1205011
http://www.diyaudio.com/forums/showthread.php?s=&postid=1205011#post1205011
Hi AdrianW
HAHA good one. I realy would like to know how that happened, coz the diffrence in size is HUGE 😀
Just a little project
Minature amp based on TDA2030AV chips. 160VA transformer 15+15VAC giving +/- 21V DC with rectification by 8A bridge and 4700uF smoothing caps. Circuit is standard design from datasheet constructed on stripboard, yet totally stable 😀 . All enclosed in an extruded aluminium case from Hammond which doubles up as a heatsink.
Minature amp based on TDA2030AV chips. 160VA transformer 15+15VAC giving +/- 21V DC with rectification by 8A bridge and 4700uF smoothing caps. Circuit is standard design from datasheet constructed on stripboard, yet totally stable 😀 . All enclosed in an extruded aluminium case from Hammond which doubles up as a heatsink.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Attachments
PMA said:
PMA
your new amp looks a "robust" construction 😎
a new PMA idea or build is often something interesting
you think you can tell a few details, please
( I am not asking for a schema )
thank you
Regards
lineup
🙂
PS. you have tested this new one,
using your proposed testsignal for audio amplifiers? DS
Thanks! .... so it is MOSFET output devices
From your second pic,
I see very compact build (not much space left!),
but on the other hand, very best use of the box internal space ( very short/minimum wiring )
with ONE Toroid in center to deliver ENERGY.
Nice and good work, of course.
( we do not expect anything else from Tjeckien .. and P.M. )
Like in Ice-Hockey, Tjeckien is often delivering good quality
... which many times can be trouble for Sverige,
Tre Kronor, 3 Crowns, Drei Kronen = The Blue and Yellow team: Sweden
From your second pic,
I see very compact build (not much space left!),
but on the other hand, very best use of the box internal space ( very short/minimum wiring )
with ONE Toroid in center to deliver ENERGY.
Nice and good work, of course.
( we do not expect anything else from Tjeckien .. and P.M. )
Like in Ice-Hockey, Tjeckien is often delivering good quality
... which many times can be trouble for Sverige,
Tre Kronor, 3 Crowns, Drei Kronen = The Blue and Yellow team: Sweden
Hi lineup,
actually not much space left, dimensions are 38 x 22 x 7 cm (15" x 8.7" x 2.75" - for US readers), and 225VA Talema toroidal transformer inside.
actually not much space left, dimensions are 38 x 22 x 7 cm (15" x 8.7" x 2.75" - for US readers), and 225VA Talema toroidal transformer inside.
PMA said:
Hi PMA
It is very good and clear construction. I have only one question. The power transformer and the PCBs don’t need ventilation? I don't see airing slots (notches) or holes in the top cover.
Fotios
Member
Joined 2002
Here is one of my chassis, this holds 2 Aleph Mini a's 20watts class a each. One chassis per speaker, so i can bi-amp.
Jase
Jase
An externally hosted image should be here but it was not working when we last tested it.
PMA said:
Hi Pavel,
Very nicely built!
Is it a real D2S amp, as described by Ian Hegglun in EW+WW, 1995?BTW, you do like exotic topologies, don't you. (nothing wrong with that!)
Cheers, Edmond.
jleaman said:
Great Solid construction - and using Master Nelson's circuits.
Bi-amping is the Ultimate Way!
Many good things from true, 2 amplifiers per loudspeaker, biamping.
This is my final goal:
- Build 2 two-ways loudspeakers
- Drive each woofer with it's own Power amplifier = 4 endstage mono amplifiers
Maybe some day come true .... I hope.
One simple way, is to build it using 4 x LM3875 National Power IC amps.
These modules are put inside loudspeaker box.
Then I need one stereo preamplifier with volume control
and some signal cables to feed loudspeaker + amplifier modules.
And a clever way, to switch POWER ON to my complete setup.
If dreams could make wishes come True
- this is what I would really would do
Regards - and thanks for your nice image, jleaman
lineup
Lineup Audio Labs
🙂
estuart said:
Hi Pavel,
Very nicely built!
BTW, you do like exotic topologies, don't you. (nothing wrong with that!)
Cheers, Edmond.
Hi Edmond,
basically, yes. Semptember 1995 issue, Fig.2. R3 and R4 resistors are replaced by current sources, that are connected to supply rails. This has improved noise background at lower frequencies and stability. The opamp voltage gain stage is placed in front of the original circuit and the output stage gain is reduced to 4x. There is a global NFB. And yes, I like the bright circuit ideas 😉
Regards,
Pavel
Member
Joined 2002
lineup said:
Thank's for the kind words 😛
Im bi-amping these :
An externally hosted image should be here but it was not working when we last tested it.
and switching between these.
An externally hosted image should be here but it was not working when we last tested it.
