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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
need help for degugging
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jean bender



Joined: Feb 21, 2010
Posts: 133
Location: france

PostPosted: Thu Aug 25, 2011 8:45 am    Post subject: need help for degugging
Subject description: from breadboarding to soldering
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Hi everybody !

I've got few questions :

I've breadboard a boolean sequencer, which was made as is :

one 555 ( 10uf cap clock) (no resistor btw lfo output and 4040 clock input) -> 4040 input -> all cd4040 outputs go to two cd4030 inputs through dipswitch.

It was working really fine, and when i was clocking the lfo to its top rate, 4030s went mad and i had funny noises

So it was working really good, so i soldered it as is, but now, when i turn my lfo up, it seems to freeze the cd4030 action, so when the clock is too high, 4030s can not work, they stop comparating and just give one note per logic gate...

I've put a 47uf cap btw v+ and v- and i've also put a 0.1uf btw V+ and v+ pin from the cd4040.

I think there's a trick, but i don't know how to find it, since everything was alright on my breadboard...

Any idea ?
thanks !

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jean bender



Joined: Feb 21, 2010
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Location: france

PostPosted: Thu Aug 25, 2011 9:45 am    Post subject: Reply with quote  Mark this post and the followings unread

An i also would be pleased to know which kind of solderboard you like, and where you buy them !!
thanks !!

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bubzy



Joined: Oct 27, 2010
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PostPosted: Thu Aug 25, 2011 10:18 am    Post subject: Reply with quote  Mark this post and the followings unread

we will need a schematic Smile
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jean bender



Joined: Feb 21, 2010
Posts: 133
Location: france

PostPosted: Thu Aug 25, 2011 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

mmm i've followed the schematic given by inventor about its boolean sequencer...
it's pretty easy, i've breadboarded it easylly, my question is more about the way you go from a breadboard to a veroboard, and the tricks you can have to do to make it better.
....

the schematics are in the thread i made about boolean sequencer in the lunetta main thread !

Razz Razz

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brock



Joined: May 26, 2011
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PostPosted: Thu Aug 25, 2011 6:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi deadbeat,

I just took a look at your schematic and I have never seen a 555 configured like that. Does it actually run? You might want to think about configuring it in the typical astable mode as found in most data sheets like this one, http://www.national.com/ds/LM/LM555.pdf, Figure 4 on page 7.

Good luck, Brock
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jean bender



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PostPosted: Tue Aug 30, 2011 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks brock.

Really amazing, what happens there : i built it last month on breadboard, and it was working fine..
Well, i think i will use 4046 for lcos, or try to see if i can use some cd40106's oscillators, as some of them are "free".

I also think that i've got some static electricity problem, since some of the cd40106 osc interracts each other...

i'll rebuilt it soon ! And let you know what happens !

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brock



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PostPosted: Tue Aug 30, 2011 9:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I also think that i've got some static electricity problem, since some of the cd40106 osc interracts each other...


I don't think that's static electricity. Static problems with cmos usually result in dead chips because gate junctions get destroyed. Oscillator interaction is often due to stray capacitance but there are a few things that can cause this including poor grounding of the chip and floating unused inputs.
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