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 Forum index » DIY Hardware and Software » fonik's place
foniks baby 10 sequencer
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Wed Oct 05, 2011 11:24 am    Post subject: foniks baby 10 sequencer
Subject description: a few things I am wondering
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So. The questions are:
The CV bus goes through the 100k pots and then it passes a 1n914. The gate bus passes a 1n4148 after the on/off switch. What is the purpose behind that?
I thought the two diode-types would do the same.

Second question is, can you use 1 diode right after the 4017 division output for both - the cv pots and the gate?
Like this:
4017 output / diode / CV pot, split gate switch

I am asking because I tried once to build a baby 8 with gate on/off switch.
It didnt work...

http://www.modular.fonik.de/Page22.html
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Wed Oct 05, 2011 12:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
The CV bus goes through the 100k pots and then it passes a 1n914. The gate bus passes a 1n4148 after the on/off switch. What is the purpose behind that?


Those sorts of diodes are called steering diodes. They keep the high level from whichever gate is active from going back into the other gate lines. The same thing is true with the CV out. If the diodes weren't there, whichever pot is selected at a given time would be able 'see' all of the other pots, and it's output voltage would be affected by the settings on those other pots.

One way you can look at the diodes on the gate that may help - that group of diodes is really equivalent to a great big 'or' gate. Whenever there is a '1' on any of those gate lines, the output (at the cathode of the diodes) with go to a '1' unless the gate switch is open for that particular line.

And a 1N914 is absolutely the same as 1n4148.

Gary
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Tue Oct 11, 2011 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

...I did it again...

I shouldnt bother you guyes here on the forum, but this weekend I tried to build a 8 step sequencer again ...and I failed... again!

My wife tried to console me but I still suffer. I know this is my private war, only me and the baby 8 but I had to tell you about.

= this means "Arschgeige" in German
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Tue Oct 11, 2011 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
...I did it again...

I shouldnt bother you guyes here on the forum, but this weekend I tried to build a 8 step sequencer again ...and I failed... again!

My wife tried to console me but I still suffer. I know this is my private war, only me and the baby 8 but I had to tell you about.


When I was first starting out in electronics, I used to get such a thrill from doing things like wiring up an LED and seeing that it actually did light up.

Over the years I discovered that it took more and more work for me to get that same thrill. I also discovered that nothing is ever as simple as it seems like it should be.

I am now at the stage where I try NEVER to build anything of my own unless it's absolutely necessary. In some cases I will buy someone's PC board, and use a small section of it to do what I need, but I almost never build anything from scratch. We all fight that battle. It just depends on how much energy you have to devote to it.

An old friend of mine used to complain about his job all the time. I asked him "If you hate it so much, why do you still do it?" His answer - "Because it feels so good when I stop". Wink

Gary
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Wed Oct 12, 2011 10:23 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks for the kind words.

Yes, the thrill is not so easy to get anymore. Around one and a half year ago I started with electronics by cracking my walkman into a feedback distortion oscillator. Cool
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