Hi Ken
This thread has got a bit bogged down in talking about Earth Connections in my Power Supply , sorry.
Getting back to my original query...you suggested increasing the Decoupling Caps value.
We are talking about the 10uf 35V x2 and the 100n x2 on each Oscillator , yes ?
Should i try for something like 22uf for the electrolitics and whatever is the next value up for he Ceramics ?
Also , your suggestion for the 1K 1 watt resistor for the Signal ground ; would i install this between the 0V out of the 15V side of my Power Module and before the Banana Jack for my signal ground ?
________________________________
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Monday, October 17, 2011 8:24 PM
Subject: Re: [cgs_synth] Re: Best of CGS Panel #3 Oscillator signal bleed problem
I never connect my signal ground directly to mains ground. I always put a 1k
1 watt resistor between the two. This helps prevent ground/hum loops. That
also means that my panels cannot be mounted hard to a metal case that is
grounded to mains earth. I solve that by having my power supplies in their
own metal cases which are earthed to mains earth. The resistor between 0V
and mains earth is then installed in the power supply. If the power supply
needs to go into the same case as the rest of the synth, the power supply's
own smaller cabinet is mounted using some sort of insulators, such as small
rubber shock mounts, and the 0V connection is connected to the panel/case
earth.
Ken
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
[Non-text portions of this message have been removed]
This thread has got a bit bogged down in talking about Earth Connections in my Power Supply , sorry.
Getting back to my original query...you suggested increasing the Decoupling Caps value.
We are talking about the 10uf 35V x2 and the 100n x2 on each Oscillator , yes ?
Should i try for something like 22uf for the electrolitics and whatever is the next value up for he Ceramics ?
Also , your suggestion for the 1K 1 watt resistor for the Signal ground ; would i install this between the 0V out of the 15V side of my Power Module and before the Banana Jack for my signal ground ?
________________________________
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Monday, October 17, 2011 8:24 PM
Subject: Re: [cgs_synth] Re: Best of CGS Panel #3 Oscillator signal bleed problem
I never connect my signal ground directly to mains ground. I always put a 1k
1 watt resistor between the two. This helps prevent ground/hum loops. That
also means that my panels cannot be mounted hard to a metal case that is
grounded to mains earth. I solve that by having my power supplies in their
own metal cases which are earthed to mains earth. The resistor between 0V
and mains earth is then installed in the power supply. If the power supply
needs to go into the same case as the rest of the synth, the power supply's
own smaller cabinet is mounted using some sort of insulators, such as small
rubber shock mounts, and the 0V connection is connected to the panel/case
earth.
Ken
>Hi MikeOut Ground Connection.
>
>I'm connected to the Main Earth Stud on the 240V side for the Signal
>side , is that correct ?
>So i should connect Signal Out Ground Connection to the Ground on the 15V
>the Chassis ?
>Do any of the Earth / Ground connections need to be physically connected to
>is at the beginning point for multiple module connections.
>I'm going to keep my Signal Out Ground connection at the Power Module is it
>__________________________________________________________
>My module power connections are Daisy chained pre CGS distro boards.
>
>cheers for the help
>
>Stephen
>
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>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
[Non-text portions of this message have been removed]