Sound lab gate in problem

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

ok. I replaced all these components, by new parts.

-R3
-IC2
-IC1
-Q8
-C2

Nothing changed. I still 1.60V at pin 1 of IC1. and the voltage on pin 1 of the socket without IC1 is 0v.

I have no idea what may be happening.

Any suggestions?

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

nothing???

Skrog Productions · Posted: Fri Mar 26, 2010 10:07 pm Post subject:

Is your Gate switch a normally open or normally closed type momentary push switch ?

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

You're referring to the button in this picture?
Posted Image, might have been reduced in size. Click Image to view fullscreen.

I have no problem with that button. this works perfectly. The button is normally open, is activated when pressed. closes the circuit when pressed.

My problem is that when I connect on 16 step sequencer to the sound lab by the gate in / out, I can not turn off the sound of each step through the switches of the Sequencer. At the exit gate of the Sequencer, the voltages are correct. show different types of gate voltage when the switches are turned on and brought to 0v when turned off. The problem is when I connect the sound lab. the exit gate of the Sequencer mark 0v all the time regardless of the state of the gate switches the Sequencer.

slacker · Posted: Sat Mar 27, 2010 1:29 pm Post subject:

I would check that D7 and D8 are the correct way round, if either of those was wrong then the gate in will not work.

Also what happens if you touch the point marked X3 to +9 volts. That should trigger the ADSR.

RF · Posted: Sat Mar 27, 2010 2:45 pm Post subject:

How about the patch cord you are using to connect from the sequencer Gate out to the Soundlab Gate in? You sure that's wired correctly?
Are you running these from the same power supply - what power supply or supplies are you using?

bruce

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

Uncle Krunkus · Posted: Mon Mar 29, 2010 1:37 am Post subject:

That last picture rings alarm bells for me.

RF · Posted: Mon Mar 29, 2010 4:04 am Post subject:

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

but the Sequencer works very well with these two sources. The voltages are fine, and according to my measurements I have good voltage levels everywhere.
What would be the technical explanation as to why I can not or should not I use these sources? or why these sources affect only that portion of Gateout, while everything else works perfectly?

Skrog Productions · Posted: Mon Mar 29, 2010 9:32 am Post subject:

Those power packs are not well regulated or smoothed inside , I would not recommend using that setup. The power supply for any diy project is the most critical and often overlooked first stage of a build.

On the MFOS site Ray has good instructions to build a wall wart power supply convertor to use a 1Amp (1000mA) power pack and convert it to dual supply, safely , that would run your sequencer & soundlab just fine.

Even better , if you plan expanding your diy projects, is a Transformer with dual secondary windings & a suitable circuit to rectify / smooth & regulate, but never dabble with mains power supplies unless you have the experience & skill in safe electrical working practise.

Please read this page.....
http://www.musicfromouterspace.com/analogsynth/WALLWARTSUPPLY/WALLWARTSUPPLY.php

And when you do build this, make sure you get a 1000mA , 12V , AC , unregulated power pack transformer to supply the MFOS circuit.

Having a stable, good power supply is half the battle when fault finding.

Have fun , when it's all working, it will happen , Smile

Dave

slacker · Posted: Mon Mar 29, 2010 10:24 am Post subject:

Monstruarte · Joined: Sep 25, 2009 Posts: 73 Location: Argentina

Skrog Productions · Posted: Sat Apr 03, 2010 4:35 am Post subject:

There is a deafning silence from this thread now , did you manage to fix the problem ??? , what were your methods ??? did running the sequencer from two 9V batteries do the trick ????