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Replacement output stage

Replacement output stage

2006-08-12 by Antoine Deschênes

Hi everyone,

I told a while ago that I would make (or at least try to make) a new 
output stage for the K5 (To have less background noise) so I think it 
should be time to start making some schematics and try them! ;)

The biggest problem I think I'll have is with the power supply. It only 
provides +6V DC to the opamps, and to get the best sound as possible, a 
new voltage would be requiered.

I'll try to keep the current potentiometer working, and maybe add an 
option to bypass it so it could, as an example, have a fixed-volume MIX 
and 1 to 4, but the volume control still working for the headphones, or 
something like that.

I think I should make it as flexible as possible by using jumpers. (But 
I will not provide any external switches, that's up to you, I will never 
drill an hole in the synth.)

Any suggestions?

Cheers,
Antoine

Re: Replacement output stage

2006-08-23 by antdes45

Any features you'd like to have? Is anyone interested? 

I think I found a solution to have some external controls which
wouldn't require modifications of the synth case itself. I'll get into
details as I'm not 100% sure it would be convenient.

--- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@...> wrote:
>
> Hi everyone,
> 
> I told a while ago that I would make (or at least try to make) a new 
> output stage for the K5 (To have less background noise) so I think it 
> should be time to start making some schematics and try them! ;)
> 
> The biggest problem I think I'll have is with the power supply. It only 
> provides +6V DC to the opamps, and to get the best sound as possible, a 
> new voltage would be requiered.
> 
> I'll try to keep the current potentiometer working, and maybe add an 
> option to bypass it so it could, as an example, have a fixed-volume MIX 
> and 1 to 4, but the volume control still working for the headphones, or 
> something like that.
> 
> I think I should make it as flexible as possible by using jumpers. (But 
> I will not provide any external switches, that's up to you, I will
never 
Show quoted textHide quoted text
> drill an hole in the synth.)
> 
> Any suggestions?
> 
> Cheers,
> Antoine
>

Re: Replacement output stage

2006-12-15 by caladann

I am very interested!! I saw some plans on the web to boost the 
output level by replacing some resistors, I dont know if you have 
seen them...
Something must be done to bring this synth to its full potential!

--- In k5synth@yahoogroups.com, "antdes45" <antdes45@...> wrote:
>
> Any features you'd like to have? Is anyone interested? 
> 
> I think I found a solution to have some external controls which
> wouldn't require modifications of the synth case itself. I'll get 
into
> details as I'm not 100% sure it would be convenient.
> 
> --- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@> 
wrote:
> >
> > Hi everyone,
> > 
> > I told a while ago that I would make (or at least try to make) a 
new 
> > output stage for the K5 (To have less background noise) so I 
think it 
> > should be time to start making some schematics and try them! ;)
> > 
> > The biggest problem I think I'll have is with the power supply. 
It only 
> > provides +6V DC to the opamps, and to get the best sound as 
possible, a 
> > new voltage would be requiered.
> > 
> > I'll try to keep the current potentiometer working, and maybe 
add an 
> > option to bypass it so it could, as an example, have a fixed-
volume MIX 
> > and 1 to 4, but the volume control still working for the 
headphones, or 
> > something like that.
> > 
> > I think I should make it as flexible as possible by using 
jumpers. (But 
> > I will not provide any external switches, that's up to you, I 
will
Show quoted textHide quoted text
> never 
> > drill an hole in the synth.)
> > 
> > Any suggestions?
> > 
> > Cheers,
> > Antoine
> >
>

RE : [k5synth] Re: Replacement output stage

2006-12-15 by Antoine Deschênes

Yes, I saw them, but you get a lot of new problems
with the headphones output, it's still as noisy as
before, but there's a sudden gain boost when you rise
the volume which seems to clip the LM386 amplifier.

Maybe it's just a matter of filtering the power going
to the output chips, because the line outputs used
with a separate hedphones amp produces much less noise
than using the headphones output. 

Now that I see that someone is interested, I'll start
to look for possible upgrades.

Antoine

--- caladann <caladann@...> a \ufffdcrit :

> I am very interested!! I saw some plans on the web
> to boost the 
> output level by replacing some resistors, I dont
> know if you have 
> seen them...
> Something must be done to bring this synth to its
> full potential!
> 
> --- In k5synth@yahoogroups.com, "antdes45"
> <antdes45@...> wrote:
> >
> > Any features you'd like to have? Is anyone
> interested? 
> > 
> > I think I found a solution to have some external
> controls which
> > wouldn't require modifications of the synth case
> itself. I'll get 
> into
> > details as I'm not 100% sure it would be
> convenient.
> > 
> > --- In k5synth@yahoogroups.com, Antoine Desch\ufffdnes
> <antdes45@> 
> wrote:
> > >
> > > Hi everyone,
> > > 
> > > I told a while ago that I would make (or at
> least try to make) a 
> new 
> > > output stage for the K5 (To have less background
> noise) so I 
> think it 
> > > should be time to start making some schematics
> and try them! ;)
> > > 
> > > The biggest problem I think I'll have is with
> the power supply. 
> It only 
> > > provides +6V DC to the opamps, and to get the
> best sound as 
> possible, a 
> > > new voltage would be requiered.
> > > 
> > > I'll try to keep the current potentiometer
> working, and maybe 
> add an 
> > > option to bypass it so it could, as an example,
> have a fixed-
> volume MIX 
> > > and 1 to 4, but the volume control still working
> for the 
> headphones, or 
> > > something like that.
> > > 
> > > I think I should make it as flexible as possible
> by using 
> jumpers. (But 
> > > I will not provide any external switches, that's
> up to you, I 
> will
> > never 
> > > drill an hole in the synth.)
> > > 
> > > Any suggestions?
> > > 
> > > Cheers,
> > > Antoine
> > >
> >
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 


Antoine Desch\ufffdnes

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Re: RE : [k5synth] Re: Replacement output stage

2006-12-18 by Jeff B

If I remember correctly, the (stock) K5 is a bit noisy. When you replace the resistors the overall output goes up but the noise dB remains the same, so the signal-to-noise ratio goes up and sound sounds less noisy.

Jeff


----- Original Message ----
Show quoted textHide quoted text
From: Antoine Deschênes
To: k5synth@yahoogroups.com
Sent: Friday, December 15, 2006 8:26:11 AM
Subject: RE : [k5synth] Re: Replacement output stage

Yes, I saw them, but you get a lot of new problems
with the headphones output, it's still as noisy as
before, but there's a sudden gain boost when you rise
the volume which seems to clip the LM386 amplifier.

Maybe it's just a matter of filtering the power going
to the output chips, because the line outputs used
with a separate hedphones amp produces much less noise
than using the headphones output.

Now that I see that someone is interested, I'll start
to look for possible upgrades.

Antoine

--- caladann <caladann@yahoo. com> a écrit :

> I am very interested!! I saw some plans on the web
> to boost the
> output level by replacing some resistors, I dont
> know if you have
> seen them...
> Something must be done to bring this synth to its
> full potential!
>
> --- In k5synth@yahoogroups .com, "antdes45"
> wrote:
> >
> > Any features you'd like to have? Is anyone
> interested?
> >
> > I think I found a solution to have some external
> controls which
> > wouldn't require modifications of the synth case
> itself. I'll get
> into
> > details as I'm not 100% sure it would be
> convenient.
> >
> > --- In k5synth@yahoogroups .com, Antoine Deschênes
>
> wrote:
> > >
> > > Hi everyone,
> > >
> > > I told a while ago that I would make (or at
> least try to make) a
> new
> > > output stage for the K5 (To have less background
> noise) so I
> think it
> > > should be time to start making some schematics
> and try them! ;)
> > >
> > > The biggest problem I think I'll have is with
> the power supply.
> It only
> > > provides +6V DC to the opamps, and to get the
> best sound as
> possible, a
> > > new voltage would be requiered.
> > >
> > > I'll try to keep the current potentiometer
> working, and maybe
> add an
> > > option to bypass it so it could, as an example,
> have a fixed-
> volume MIX
> >; > and 1 to 4, but the volume control still working
> for the
> headphones, or
> > > something like that.
> > >
> > > I think I should make it as flexible as possible
> by using
> jumpers. (But
> > > I will not provide any external switches, that's
> up to you, I
> will
> > never
> > > drill an hole in the synth.)
> > >
> > > Any suggestions?
> > >
> > > Cheers,
> > > Antoine
> > >
>; >
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>

Antoine Deschênes

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RE : Re: RE : [k5synth] Re: Replacement output stage

2006-12-18 by Antoine Deschênes

Yep, but if you don't have a good mixer it will just
not work at high volumes. 

The main problem for me is the headphones jack. It's
as noisy on both K5s I have.
--- Jeff B <jeffbee42@...> a \ufffdcrit :

> If I remember correctly, the (stock) K5 is a bit
> noisy.  When you replace the resistors the overall
> output goes up but the noise dB remains the same, so
> the signal-to-noise ratio goes up and sound sounds
> less noisy.
> 
> Jeff
> 
> 
> ----- Original Message ----
> From: Antoine Desch\ufffdnes <antdes45@...>
> To: k5synth@yahoogroups.com
> Sent: Friday, December 15, 2006 8:26:11 AM
> Subject: RE : [k5synth] Re: Replacement output stage
> 
> 
> 
> 
> 
> 
> 
> 
> 
>   
> 
> 
>     
>             Yes, I saw them, but you get a lot of
> new problems
> 
> with the headphones output, it's still as noisy as
> 
> before, but there's a sudden gain boost when you
> rise
> 
> the volume which seems to clip the LM386 amplifier.
> 
> 
> 
> Maybe it's just a matter of filtering the power
> going
> 
> to the output chips, because the line outputs used
> 
> with a separate hedphones amp produces much less
> noise
> 
> than using the headphones output. 
> 
> 
> 
> Now that I see that someone is interested, I'll
> start
> 
> to look for possible upgrades.
> 
> 
> 
> Antoine
> 
> 
> 
> --- caladann <caladann@yahoo. com> a \ufffdcrit :
> 
> 
> 
> > I am very interested!! I saw some plans on the web
> 
> > to boost the 
> 
> > output level by replacing some resistors, I dont
> 
> > know if you have 
> 
> > seen them...
> 
> > Something must be done to bring this synth to its
> 
> > full potential!
> 
> > 
> 
> > --- In k5synth@yahoogroups .com, "antdes45"
> 
> > <antdes45@.. .> wrote:
> 
> > >
> 
> > > Any features you'd like to have? Is anyone
> 
> > interested? 
> 
> > > 
> 
> > > I think I found a solution to have some external
> 
> > controls which
> 
> > > wouldn't require modifications of the synth case
> 
> > itself. I'll get 
> 
> > into
> 
> > > details as I'm not 100% sure it would be
> 
> > convenient.
> 
> > > 
> 
> > > --- In k5synth@yahoogroups .com, Antoine
> Desch\ufffdnes
> 
> > <antdes45@> 
> 
> > wrote:
> 
> > > >
> 
> > > > Hi everyone,
> 
> > > > 
> 
> > > > I told a while ago that I would make (or at
> 
> > least try to make) a 
> 
> > new 
> 
> > > > output stage for the K5 (To have less
> background
> 
> > noise) so I 
> 
> > think it 
> 
> > > > should be time to start making some schematics
> 
> > and try them! ;)
> 
> > > > 
> 
> > > > The biggest problem I think I'll have is with
> 
> > the power supply. 
> 
> > It only 
> 
> > > > provides +6V DC to the opamps, and to get the
> 
> > best sound as 
> 
> > possible, a 
> 
> > > > new voltage would be requiered.
> 
> > > > 
> 
> > > > I'll try to keep the current potentiometer
> 
> > working, and maybe 
> 
> > add an 
> 
> > > > option to bypass it so it could, as an
> example,
> 
> > have a fixed-
> 
> > volume MIX 
> 
> > > > and 1 to 4, but the volume control still
> working
> 
> > for the 
> 
> > headphones, or 
> 
> > > > something like that.
> 
> > > > 
> 
> > > > I think I should make it as flexible as
> possible
> 
> > by using 
> 
> > jumpers. (But 
> 
> > > > I will not provide any external switches,
> that's
> 
> > up to you, I 
> 
> > will
> 
> > > never 
> 
> > > > drill an hole in the synth.)
> 
> > > > 
> 
=== message truncated ===


Antoine Desch\ufffdnes

__________________________________________________
Do You Yahoo!?
En finir avec le spam? Yahoo! Courriel vous offre la meilleure protection possible contre les messages non nollicit\ufffds 
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