Cgs synth

> I'm ordering parts for the ASR. Found this mouser part:
> 505-MKP20.1/250/5. WIMA metallized polypropylene film. It even
> says,
> "suited for sample & hold circuits." I think this is the right
> type of
> capacitor, yes? Now this is a 100nf part. There is a discussion
> on
> Ken's web page about this capacitor, which is specified to be
> anywhere
> from 47nf to 470nf. You may need to add series resistors from the
> 4052
> outputs into these caps to protect the chip. So my second question
> is
> what values have folks used here and did they need to add
> resistors?
> Details appreciated.
>
> Thanks,
>
> -Richard Brewster
>
>
>
>
> See the following URLS for the CGS Modular Synth home page:
> Main: http://www.cgs.synth.net/
> Secondary: http://otherunicorn.0catch.com/synth/
> Yahoo! Groups Links
>
>
>
>
>

>I'm ordering parts for the ASR. Found this mouser part:
>505-MKP20.1/250/5. WIMA metallized polypropylene film. It even says,
>"suited for sample & hold circuits." I think this is the right type of
>capacitor, yes? Now this is a 100nf part. There is a discussion on
>Ken's web page about this capacitor, which is specified to be anywhere
>from 47nf to 470nf. You may need to add series resistors from the 4052
>outputs into these caps to protect the chip. So my second question is
>what values have folks used here and did they need to add resistors?
>Details appreciated.
>
>Thanks,
>
>-Richard Brewster
>
>
>
>
>See the following URLS for the CGS Modular Synth home page:
>Main: http://www.cgs.synth.net/
>Secondary: http://otherunicorn.0catch.com/synth/
>Yahoo! Groups Links
>
>
>
>
>
>

>The stardard recommended cap is the 47nF IIRC. I used that one, and
>the stock op amp and I am less than satisfied with the droop. I plan
>to change the S&H op amp to a FET input amp TL071 and probably change
>the cap to a 100n. So, I think this you list below may be a good
>choice.
>Larry
>
>--- Richard Brewster <pugix@...> wrote:
>
>
>>I'm ordering parts for the ASR. Found this mouser part:
>>505-MKP20.1/250/5. WIMA metallized polypropylene film. It even
>>says,
>>"suited for sample & hold circuits." I think this is the right
>>type of
>>capacitor, yes? Now this is a 100nf part. There is a discussion
>>on
>>Ken's web page about this capacitor, which is specified to be
>>anywhere
>>from 47nf to 470nf. You may need to add series resistors from the
>>4052
>>outputs into these caps to protect the chip. So my second question
>>is
>>what values have folks used here and did they need to add
>>resistors?
>>Details appreciated.
>>
>>Thanks,
>>
>>-Richard Brewster
>>
>>
>>
>>
>>See the following URLS for the CGS Modular Synth home page:
>>Main: http://www.cgs.synth.net/
>>Secondary: http://otherunicorn.0catch.com/synth/
>>Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
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>
>
>
>See the following URLS for the CGS Modular Synth home page:
>Main: http://www.cgs.synth.net/
>Secondary: http://otherunicorn.0catch.com/synth/
>Yahoo! Groups Links
>
>
>
>
>
>
>
>

> Hi Larry,
>
> Yes, I want to use the 100n to lessen the droop. Isn't the LF356
> better
> here than a TL071? I am looking at the LF356 data sheet, and one of
> the
> features is extremely fast settling time. Must be a reason Ken
> picked it
> over the TL071. I socket all my CGS boards, because they are
> experimental, so I can play around with different chips.
>
> -Richard
>
> Larry Hendry wrote:
>
> >The stardard recommended cap is the 47nF IIRC. I used that one,
> and
> >the stock op amp and I am less than satisfied with the droop. I
> plan
> >to change the S&H op amp to a FET input amp TL071 and probably
> change
> >the cap to a 100n. So, I think this you list below may be a good
> >choice.
> >Larry
> >
> >--- Richard Brewster <pugix@...> wrote:
> >
> >
> >>I'm ordering parts for the ASR. Found this mouser part:
> >>505-MKP20.1/250/5. WIMA metallized polypropylene film. It even
> >>says,
> >>"suited for sample & hold circuits." I think this is the right
> >>type of
> >>capacitor, yes? Now this is a 100nf part. There is a discussion
> >>on
> >>Ken's web page about this capacitor, which is specified to be
> >>anywhere
> >>from 47nf to 470nf. You may need to add series resistors from
> the
> >>4052
> >>outputs into these caps to protect the chip. So my second
> question
> >>is
> >>what values have folks used here and did they need to add
> >>resistors?
> >>Details appreciated.
> >>
> >>Thanks,
> >>
> >>-Richard Brewster
> >>
> >>
> >>
> >>
> >>See the following URLS for the CGS Modular Synth home page:
> >>Main: http://www.cgs.synth.net/
> >>Secondary: http://otherunicorn.0catch.com/synth/
> >>Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >__________________________________
> >Do you Yahoo!?
> >Yahoo! Domains � Claim yours for only $14.70/year
> >http://smallbusiness.promotions.yahoo.com/offer
> >
> >
> >
> >See the following URLS for the CGS Modular Synth home page:
> >Main: http://www.cgs.synth.net/
> >Secondary: http://otherunicorn.0catch.com/synth/
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
> ------------------------ Yahoo! Groups Sponsor
>
> See the following URLS for the CGS Modular Synth home page:
> Main: http://www.cgs.synth.net/
> Secondary: http://otherunicorn.0catch.com/synth/
> Yahoo! Groups Links
>
>
>
>
>

> -----Original Message-----
> From: Larry Hendry [mailto:hendrysr@...]
> Sent: Saturday, May 22, 2004 9:08 PM
> To: cgs_synth@yahoogroups.com
> Subject: Re: [cgs_synth] Sample & Hold capacitor, CX, for Analog Shift
> Register
>
> Well, I plan to leave the original 2 I built stock. I am building 2
> more. I think I'll use the cap you have listed below (thanks). Like
> you, on this one I intend to socket the chips so I can compare. Once
> I know what I want, I'll go back and change the originals.
>
> Now, here is another question. I plan to add internal clocks for my
> 2nd dual ASR. I see no reason in many cases to tie up an external
> osc or clock for the job. I do intend to normal that to the jacks so
> I can still jack in an external clock.
>
> I am trying to decide what I think the useful range of the internal
> clock shoudl be. I want to scale the clock frequency control to only
> include the useful range. Since I am not an experianced ASR user,
> any input would be apprecited.
>
> Larry
>
>
> --- Richard Brewster <pugix@...> wrote:
> > Hi Larry,
> >
> > Yes, I want to use the 100n to lessen the droop. Isn't the LF356
> > better
> > here than a TL071? I am looking at the LF356 data sheet, and one of
> > the
> > features is extremely fast settling time. Must be a reason Ken
> > picked it
> > over the TL071. I socket all my CGS boards, because they are
> > experimental, so I can play around with different chips.
> >
> > -Richard
> >
> > Larry Hendry wrote:
> >
> > >The stardard recommended cap is the 47nF IIRC. I used that one,
> > and
> > >the stock op amp and I am less than satisfied with the droop. I
> > plan
> > >to change the S&H op amp to a FET input amp TL071 and probably
> > change
> > >the cap to a 100n. So, I think this you list below may be a good
> > >choice.
> > >Larry
> > >
> > >--- Richard Brewster <pugix@...> wrote:
> > >
> > >
> > >>I'm ordering parts for the ASR. Found this mouser part:
> > >>505-MKP20.1/250/5. WIMA metallized polypropylene film. It even
> > >>says,
> > >>"suited for sample & hold circuits." I think this is the right
> > >>type of
> > >>capacitor, yes? Now this is a 100nf part. There is a discussion
> > >>on
> > >>Ken's web page about this capacitor, which is specified to be
> > >>anywhere
> > >>from 47nf to 470nf. You may need to add series resistors from
> > the
> > >>4052
> > >>outputs into these caps to protect the chip. So my second
> > question
> > >>is
> > >>what values have folks used here and did they need to add
> > >>resistors?
> > >>Details appreciated.
> > >>
> > >>Thanks,
> > >>
> > >>-Richard Brewster
> > >>
> > >>

>Instead of the LF356s on the ASR I used CA3140AEs. Most important
>parameters for a S&H buffer op amp are settling time and input bias current.
>The LF356 has better settling time but as the switch remains open for the
>entire clock cycle this parameter is not important in this circuit. For
>typical slow rates as note shift registers the op amp input bias current is
>the most important factor along with switch (4052) and capacitor leakage.
>TL071 will be worse in the application than the LF356. Other factors are
>board layout and parasitic capacitance from use of IC sockets. I do not
>recommend sockets in this application, though I can't quantify the
>contribution to the droop.
>
>I used 47N caps, Mouser part number 1429-2473. Droop did not seem to be
>significant, but I must admit I did not measure this.
>
>Op Amp Parameters
>Chip settling time input bias input offset
> To 0.01% current (pA) current (pA)
> Typ max typ max
>LF356 1.5 us 30 200 3 50
>TL071 ??? 65 200 5 100
>CA3140AE 4.5 us 10 40 0.5 20
>
>For a built in clock I recommend rates typical for note or arpeggio
>generation, roughly 0.1 Hz to 30 Hz.
>
>John Loffink
>The Microtonal Synthesis Web Site
>http://www.microtonal-synthesis.com
>The Wavemakers Synthesizer Web Site
>http://www.wavemakers-synth.com
>
>
>
>
>>-----Original Message-----
>>From: Larry Hendry [mailto:hendrysr@...]
>>Sent: Saturday, May 22, 2004 9:08 PM
>>To: cgs_synth@yahoogroups.com
>>Subject: Re: [cgs_synth] Sample & Hold capacitor, CX, for Analog Shift
>>Register
>>
>>Well, I plan to leave the original 2 I built stock. I am building 2
>>more. I think I'll use the cap you have listed below (thanks). Like
>>you, on this one I intend to socket the chips so I can compare. Once
>>I know what I want, I'll go back and change the originals.
>>
>>Now, here is another question. I plan to add internal clocks for my
>>2nd dual ASR. I see no reason in many cases to tie up an external
>>osc or clock for the job. I do intend to normal that to the jacks so
>>I can still jack in an external clock.
>>
>>I am trying to decide what I think the useful range of the internal
>>clock shoudl be. I want to scale the clock frequency control to only
>>include the useful range. Since I am not an experianced ASR user,
>>any input would be apprecited.
>>
>>Larry
>>
>>
>>--- Richard Brewster <pugix@...> wrote:
>>
>>
>>>Hi Larry,
>>>
>>>Yes, I want to use the 100n to lessen the droop. Isn't the LF356
>>>better
>>>here than a TL071? I am looking at the LF356 data sheet, and one of
>>>the
>>>features is extremely fast settling time. Must be a reason Ken
>>>picked it
>>>over the TL071. I socket all my CGS boards, because they are
>>>experimental, so I can play around with different chips.
>>>
>>>-Richard
>>>
>>>Larry Hendry wrote:
>>>
>>>
>>>
>>>>The stardard recommended cap is the 47nF IIRC. I used that one,
>>>>
>>>>
>>>and
>>>
>>>
>>>>the stock op amp and I am less than satisfied with the droop. I
>>>>
>>>>
>>>plan
>>>
>>>
>>>>to change the S&H op amp to a FET input amp TL071 and probably
>>>>
>>>>
>>>change
>>>
>>>
>>>>the cap to a 100n. So, I think this you list below may be a good
>>>>choice.
>>>>Larry
>>>>
>>>>--- Richard Brewster <pugix@...> wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>I'm ordering parts for the ASR. Found this mouser part:
>>>>>505-MKP20.1/250/5. WIMA metallized polypropylene film. It even
>>>>>says,
>>>>>"suited for sample & hold circuits." I think this is the right
>>>>>type of
>>>>>capacitor, yes? Now this is a 100nf part. There is a discussion
>>>>>on
>>>>>Ken's web page about this capacitor, which is specified to be
>>>>>anywhere
>>>>>
>>>>>
>>>>>from 47nf to 470nf. You may need to add series resistors from
>>>>
>>>>
>>>the
>>>
>>>
>>>>>4052
>>>>>outputs into these caps to protect the chip. So my second
>>>>>
>>>>>
>>>question
>>>
>>>
>>>>>is
>>>>>what values have folks used here and did they need to add
>>>>>resistors?
>>>>>Details appreciated.
>>>>>
>>>>>Thanks,
>>>>>
>>>>>-Richard Brewster
>>>>>
>>>>>
>>>>>
>>>>>
>
>
>
>
>
>See the following URLS for the CGS Modular Synth home page:
>Main: http://www.cgs.synth.net/
>Secondary: http://otherunicorn.0catch.com/synth/
>Yahoo! Groups Links
>
>
>
>
>
>
>
>

> Instead of the LF356s on the ASR I used CA3140AEs. Most important
> parameters for a S&H buffer op amp are settling time and input bias
> current.
> The LF356 has better settling time but as the switch remains open
> for the
> entire clock cycle this parameter is not important in this circuit.
> For
> typical slow rates as note shift registers the op amp input bias
> current is
> the most important factor along with switch (4052) and capacitor
> leakage.
> TL071 will be worse in the application than the LF356. Other
> factors are
> board layout and parasitic capacitance from use of IC sockets. I
> do not
> recommend sockets in this application, though I can't quantify the
> contribution to the droop.
>
> I used 47N caps, Mouser part number 1429-2473. Droop did not seem
> to be
> significant, but I must admit I did not measure this.
>
> Op Amp Parameters
> Chip settling time input bias input offset
> To 0.01% current (pA) current (pA)
> Typ max typ max
> LF356 1.5 us 30 200 3 50
> TL071 ??? 65 200 5 100
> CA3140AE 4.5 us 10 40 0.5 20
>
> For a built in clock I recommend rates typical for note or arpeggio
> generation, roughly 0.1 Hz to 30 Hz.
>
> John Loffink
> The Microtonal Synthesis Web Site
> http://www.microtonal-synthesis.com
> The Wavemakers Synthesizer Web Site
> http://www.wavemakers-synth.com
>
>
> > -----Original Message-----
> > From: Larry Hendry [mailto:hendrysr@...]
> > Sent: Saturday, May 22, 2004 9:08 PM
> > To: cgs_synth@yahoogroups.com
> > Subject: Re: [cgs_synth] Sample & Hold capacitor, CX, for Analog
> Shift
> > Register
> >
> > Well, I plan to leave the original 2 I built stock. I am
> building 2
> > more. I think I'll use the cap you have listed below (thanks).
> Like
> > you, on this one I intend to socket the chips so I can compare.
> Once
> > I know what I want, I'll go back and change the originals.
> >
> > Now, here is another question. I plan to add internal clocks for
> my
> > 2nd dual ASR. I see no reason in many cases to tie up an
> external
> > osc or clock for the job. I do intend to normal that to the
> jacks so
> > I can still jack in an external clock.
> >
> > I am trying to decide what I think the useful range of the
> internal
> > clock shoudl be. I want to scale the clock frequency control to
> only
> > include the useful range. Since I am not an experianced ASR
> user,
> > any input would be apprecited.
> >
> > Larry
> >
> >
> > --- Richard Brewster <pugix@...> wrote:
> > > Hi Larry,
> > >
> > > Yes, I want to use the 100n to lessen the droop. Isn't the
> LF356
> > > better
> > > here than a TL071? I am looking at the LF356 data sheet, and
> one of
> > > the
> > > features is extremely fast settling time. Must be a reason Ken
> > > picked it
> > > over the TL071. I socket all my CGS boards, because they are
> > > experimental, so I can play around with different chips.
> > >
> > > -Richard
> > >
> > > Larry Hendry wrote:
> > >
> > > >The stardard recommended cap is the 47nF IIRC. I used that
> one,
> > > and
> > > >the stock op amp and I am less than satisfied with the droop.
> I
> > > plan
> > > >to change the S&H op amp to a FET input amp TL071 and probably
> > > change
> > > >the cap to a 100n. So, I think this you list below may be a
> good
> > > >choice.
> > > >Larry
> > > >
> > > >--- Richard Brewster <pugix@...> wrote:
> > > >
> > > >
> > > >>I'm ordering parts for the ASR. Found this mouser part:
> > > >>505-MKP20.1/250/5. WIMA metallized polypropylene film. It
> even
> > > >>says,
> > > >>"suited for sample & hold circuits." I think this is the
> right
> > > >>type of
> > > >>capacitor, yes? Now this is a 100nf part. There is a
> discussion
> > > >>on
> > > >>Ken's web page about this capacitor, which is specified to be
> > > >>anywhere
> > > >>from 47nf to 470nf. You may need to add series resistors
> from
> > > the
> > > >>4052
> > > >>outputs into these caps to protect the chip. So my second
> > > question
> > > >>is
> > > >>what values have folks used here and did they need to add
> > > >>resistors?
> > > >>Details appreciated.
> > > >>
> > > >>Thanks,
> > > >>
> > > >>-Richard Brewster
> > > >>
> > > >>
>
>
>
>
> ------------------------ Yahoo! Groups Sponsor
>
> See the following URLS for the CGS Modular Synth home page:
> Main: http://www.cgs.synth.net/
> Secondary: http://otherunicorn.0catch.com/synth/
> Yahoo! Groups Links
>
>
>
>
>