What?... Another Aleph 5?

[Leeuwarden]

Yes... Couldn't resist because it is a huge step forward compared to my old amps! I'm happy

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.

I guess it's time to make an enclosure...

Jan

 

[bocka]

Very nice cap on the left side...

 

[Leeuwarden]

Yes, gives the overall sound more body...

Jan

 

[Taco]

Nice job Leeuwarden, are those caps from Piersma?

 

[Leeuwarden]

Thanks... No the're not from Piersma. (bought 4 of his caps for a future project, probably another Aleph 5.) Got these frome someone else.

Jan

 

[jleaman]

I was going to build the aleph 5 but i ditched it as i wanted more power and thought that i should just start investing in the aleph 2 instead. So how does it sound. ?

maybe i should start a aleph 5 Humm heh. now you got me thinking.

i think ill just finnish the aleph 2's first then go from there.

 

[Leeuwarden]

Jason,

Sound is much better then my old amps (Thel) The highs are bright, clear but not sharp, bass is twice as deep as with my old amps. It does not sound flat either, actually i'm really happy with this amp.

Since I have no experience with electronics, I consider it a great project. It worked right away. I'm planning to replace the 392 ohm restistor for a pot with a serie resistor to get rid of the dc-offset of a 180mV. The other channel has 30 mV offset.

Jan

 

[jleaman]

I so cant wait to hear my alephs then. i want to hear some crisp clean sound. heh. OTAA be time now.

i really want to finnish my aleph's.

i need to also build some speakers though. so i should start on that too.

money talks and bull crap walk's though..

 

[Piersma]

Jan,

Nice decoupling MKP caps.. and ofcourse i like the blue LED !
Now it is time for the real thing.... the enclosure !

 

[Duck-Twacy]

Now it is time for the real thing.... the enclosure !

What, its not final? There will be more?!!

 

[Leeuwarden]

Yes! There wil be more...
Some protective enclosure to keep our 10 week old cat from getting fried... So for now... cat in the kitchen and amps on!

Jan

 

[jleaman]

NICE kitty.. pprrr pprrrr prrrrr BANG. lol.


yeah keep a eye out for that loose kitty we don't want to hear about a fatal accident.. : O )

 

[Taco]

Fatal Aleph or Kitty

 

[jleaman]

kitty... : O )

 

[Leeuwarden]

Yeah I know: wrong timing to get a cat... (she arrived last saturday...) Oh well, maybe it's better this way. It usually takes me a year or so to finish the details... (like an enclosure...)

 

[jleaman]

i'm actually thinking about getting a kitty soon. I want a orange and white one. a nice tabby one. then i want it to be fat and lazy and DE-CLAUD-ED hehe : O )

 

[wuffwaff]

problem with having a cat is that it keeps delivering presents you´ll have to get rid off

william

 

[Leeuwarden]

Nice for christmas... Anyway let's stop about cats... This thread actually started to show my Aleph 5 in the "nude". Anyone any comment on post 7 about offset?

Jan

 

[kristijan-k]

Lowering the offset

Hello Jan,

The offset would be minimized if you would use
matched input IRF 9610 transistors.
The matching is very easy, and it can be done in a few minutes.
You can use attached circuit diagram for the matching mosfet
devices.
The 30 mV is ok, but with the good matched transistors, the
offset can be still lower.
The 180 mV is also not that too high like it's sound, but for the
DIY Aleph standard I guess that the most of the people would
try to lower this value also.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

 

[Piersma]

Offset problem

Ofcourse the first step is to use closely matched FETs and if there is still to much offset, match the resistors also. Value of the resistors is off less value than the matching !


regards
Piersma