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cyrax
Joined: Mar 18, 2012 Posts: 3 Location: Greece
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Posted: Tue Mar 20, 2012 2:29 pm Post subject:
new lunetta addict,questions before first build |
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Hi all!
I am new to both the forum and lunettas . I've been reading this subforum for a while ,gathering knowledge from all of you ,and firstly I want to say you are doing a great work!
I went ahead and bought some components to start experimenting and now I have some things I want to clear out before I start soldering
I have decided to build the sea moss sequencer for a start, I tested it on a breadboard (with resistors , not pots ) and it works perfectly. I was actually surprised how loud and full these tiny chips sound! (or maybe I am just fascinated )
On to my questions:
From what i understand the first oscillator on the 40106 is the clock and the second provides the sound that is sequenced. If so , could i use a switch and banana jack or something like that so that I disable them and use other lunetta modules instead?
Also, could I use this sequencer with my korg monotron ?
As for pots instead of resistors , what would happen if I used 10K pots (that I have) ?
I also thought of using switches to turn on and off steps but for some reason I have a feeling that would not work
Finally, could you please tell me the correct way of wiring leds with a pull down resistor on the pots ?
That's all fpr now (at last!! )
I also want to apologise for the megapost and for any stupidity that might exist in it
PS this is the schematic , I found it here and I guess everyone is familliar with it , I just posted it so that it's in handy
_________________ -How many roads must a man go down?
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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synthesist
Joined: Feb 17, 2011 Posts: 79 Location: austria
Audio files: 2
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Posted: Wed Mar 21, 2012 7:36 am Post subject:
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regarding the banana jacks: you could leave the clock oscillator open and just plug it into the module when needed. So you can use it for a different module too.
Also you could solder the other divisions Q1 to Q12 on banana jacks to be able to switch them into the adress pins (A-B-C) to variate the rythm.
Just be carefull and ask for advice before you play the lunetta squarwaves into the monotron filter. The squarewaves are very hot and have lots of DC-portion...
Have fun building
xonrad |
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cyrax
Joined: Mar 18, 2012 Posts: 3 Location: Greece
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Posted: Thu Mar 22, 2012 11:14 am Post subject:
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Thanks for the replys guys,you have been very helpful!
JingleJoe , I am sorry , I didn't express what I wanted to say right, I am still confused with some terms. By "pull down resistors" I meant the resistors for the leds. I read more about that and figured it out. Nevertheless your post helped me figure out more about what's going on inside the 4051
Sunthesist , That was a mean thing to propose, you just upped my expenses on banana plugs a lot
I decided to go with the modular approach
And on to the new questions
I ve been reading again and again this very informative post by Rykhaard on this topic
he says :
Quote: | When you are having inputs that DO have something hooked up to them, it is a standard practice in music electronics to give the inputs a 100,000 ohm impedance |
Quote: | Finally - as to Outputs, it has been standard practice since about the mid 1970's, to put a 1,000 ohm 1/4 watt resistor on to the output pin from the chip. |
does this mean that every banana jack should have a resistor between it's connection and the I/O of the chip?
Second and last question that occured to me from the same topic
Quote: | A solution here (that I wasn't taught until 1991), is add a SMALL capacitor as close as possible to the power INPUT pin, of EACH of those chips. |
this "reservoir" should go from the power pin to ground, or between the battery and the power pin? _________________ -How many roads must a man go down?
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Thu Mar 22, 2012 2:35 pm Post subject:
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The capacitor resevoir should go from + to ground, if placed in series with the chip you would get a quick blip then nothing; capacitors only conduct as they charge, thus when fully charged they block current, this is why they only allow AC through.
The purpose of the cap, just incase you didnt know, is to stop interference from power supply fluctuations, for exmaple, those incurred when something else using the same power supply draws significant current.
Not too sure about those 100k resistors though, I thought that was just the standard input impedance of voltage controled analogue doohickeys. _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Green Dungeon Alchemist Laboratories |
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