Antix MidiBox SID

MIDIbox Gallery
41

Re: MBFM

Please tell me how you did the paint work and got the text so nice … did you silk screen?

42

Re: MBFM Desktop

Thank Grizz :smile:

43

Re: MBFM

Hi Nebula,

yes silk screen for the text and acrylic paint for the other graphics.

but I have to learn to be more accurate, the characters are OK but the border of the black frame is not very clear.

Regards

44

Re: MBFM

Looks great, man!

45

Re: MBFM

Thanks guys,

Still missing the plexiglass window on the lcd ( you can see the holes for the screw )

so…it is not really completed yet.

But I can play it the same

Regards

46

Re: MBFM

Nice! I like it.

47

Re: MBFM

Fantastic! Well done!

48

Re: MBFM

Thanks Guys

I am grateful for your appreciation

Greets

Antix

49

Re: MB6582 Supply

That looks good :slight_smile:

If I only could remember where I´ve seen a PSU like this before :slight_smile:

50

Re: MB6582 Supply

also nice to see the crowbar circuit :slight_smile:

Could you do an A-B listening test with your old C64 PSU, if you have one?

I seem to have slightly more noise with this PSU (like a 50Hz hum, but don´t know where it comes from- the components are all top-notch and the capacitators should work their ripple-softening magic…)

Greets, Peter

51

Re: MB6582 Supply

Yes…

if you make me think about …seems that

I see something like here in the forum

:whistle:

52

Re: MB6582 Supply

Peter,

I dont understand ; do you have noise with C64 PSU or with this new PSU?

Yes I have an old C64 PSU for comparison but I will be able to do the test when I will finish the MB6582.

Antonio

53

Re: MB6582 Supply

Hi Antonio,

I feel to have a little bit more noise with the new PSU… but not really very well audible, i´d be interested if you hear it, too - but no hurries… have fun building the rest of the MB6582 :slight_smile:

Greets,

Peter

54

Re: MB6582 Supply

OK now is clear :slight_smile:

It is strange as you used modern el-parts.

may the crowbar section insert some noise ?

This is the first time I use it in my linear supply ( usually I trust in 78xx ).

Greets

Antonio

55

Re: MB6582 Supply

Hi Antonio,

I am not good enough in electronics to guess what is exactly wrong… but I somewhere read, that ground-hum can be because of the ground connection between different audio gear, that have different PSUs.. gotta read more regarding this… and test, if the hum also occurs, if I only plug head-phones into the MB6582…

Other possibilities would be the crowbar, as you mentioned (could deactivate that subcircuit for a test)… or wrong filtering capacitators…

but I don´t have a oscilloscope to have a peek, yet :slight_smile:

But it is not really problematic, just barely audible, and am interested, if you hear it, too :wink:

Greets and have a good time!

Peter

56

Re: MB6582 Supply

3 Ampère ? and you use Vregs in TO-220 package !!

please please which Vreg are you using? i just know the 78Sxx / 79Sxx type that can deliver a max of 2A.

but i need moar :rolleyes:

57

Re: PowerSupply

Very nice, including the two LEDs :slight_smile:

58

Re: MB6582 Supply

MC78C05T FTW!

3 Amp TO220 5V Voltage Regulator

http://www.datasheetcatalog.org/datasheets/166/438769_DS.pdf

59

Re: PowerSupply

Thanks Peter

Green for 5

orange for 9

60

Re: PowerSupply

Hi Antonio,

Cool! - we have an interesting build difference - I have green (5v after vreg) and another green (5v after protection circuit) :slight_smile:

Do you already have comments on audio quality/audible hum?

Greets!

Peter