sci.electronics.repair - 25 new messages in 9 topics - digest

sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en

sci.electronics.repair@googlegroups.com

Today's topics:

==============================================================================
TOPIC: JVC MXD 752 CD etc compact audio unit
http://groups.google.com/group/sci.electronics.repair/t/8b7f65038283bf79?hl=en
==============================================================================

== 1 of 5 ==
Date: Tues, Apr 5 2011 12:32 am
From: "N_Cook"

Uses "3 disc triple play , play & exchange" 3 drawers stacked over one
another and the CD deck on an elevator system to access them. Can anyone
point to explanation of the mechanics of this or as used in other models.
Uses 6 motors in all. The elevator looks like 2 steppers built inside
cylindrical cam actuators and a mode switch, 5 +5 traces to the motors and
10 way to limit/mode something.

== 2 of 5 ==
Date: Tues, Apr 5 2011 1:45 am
From: "Arfa Daily"

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:inegij$b0u$1@dont-email.me...
> Uses "3 disc triple play , play & exchange" 3 drawers stacked over one
> another and the CD deck on an elevator system to access them. Can anyone
> point to explanation of the mechanics of this or as used in other models.
> Uses 6 motors in all. The elevator looks like 2 steppers built inside
> cylindrical cam actuators and a mode switch, 5 +5 traces to the motors and
> 10 way to limit/mode something.
>
>

The service manual has a full blown dismantling procedure for the changer
(which seems to be called a "CD Changer Mech Type VC3" , but no actual
description of how it works. I could send you the manual if you have an
account that could accept it, but last I recall, you were not broadband, so
a 15 meg pdf would take about a year for you to download ?? Contact me
off-group if you want to try to arrange something.

Arfa

== 3 of 5 ==
Date: Tues, Apr 5 2011 1:48 am
From: "N_Cook"

the CD changer mechanics look the same as the older PC-XC10 , the active
electronics board is different.
5 wire mode switch inside each cam and separate 10 line connection for limit
switches. Cams driven by cog train from a standard DC motor each ,
elsewhere, so 4 motors only. One for trays and one for CD deck elevator.
Will try some DC on these motors and see what happens.

== 4 of 5 ==
Date: Tues, Apr 5 2011 1:55 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:6FAmp.3076$Pi.274@newsfe22.ams2...
>
>
> "N_Cook" <diverse@tcp.co.uk> wrote in message
> news:inegij$b0u$1@dont-email.me...
> > Uses "3 disc triple play , play & exchange" 3 drawers stacked over one
> > another and the CD deck on an elevator system to access them. Can anyone
> > point to explanation of the mechanics of this or as used in other
models.
> > Uses 6 motors in all. The elevator looks like 2 steppers built inside
> > cylindrical cam actuators and a mode switch, 5 +5 traces to the motors
and
> > 10 way to limit/mode something.
> >
> >
>
> The service manual has a full blown dismantling procedure for the changer
> (which seems to be called a "CD Changer Mech Type VC3" , but no actual
> description of how it works. I could send you the manual if you have an
> account that could accept it, but last I recall, you were not broadband,
so
> a 15 meg pdf would take about a year for you to download ?? Contact me
> off-group if you want to try to arrange something.
>
> Arfa
>

The XC10 has much the same info (or not), exploded views only. Desoldering
the 4 CD deck motor points and removing the main pcb along and knowing now
being able to power ordinary motors, outside the chassis, should ellicit
enough. When I get back to it.

Got bogged down with a massive German massager chair repair at the moment ,
that needs repairing and clearing , to give space - a priority.
2x2x5 foot leather-clad awkward heap.

== 5 of 5 ==
Date: Tues, Apr 5 2011 7:32 am
From: "N_Cook"

Using 8V one motor powers the shift helical cam and the other moves drawer
and sub draws in and out and the CD deck up and down via a PTO linkage and
its helical cam. Limit switches work as well. Leaves just something wrong
with the mode sw or "cam switches" as JVC calls them. There is the matrix
for all those in the manual but to progress all that manually seems too
much.

==============================================================================
TOPIC: SEXY HOT PHOTOS
http://groups.google.com/group/sci.electronics.repair/t/c7b96328bbba8667?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 5 2011 1:27 am
From: SRAVANTHI LOVE

==============================================================================
TOPIC: HOLLYWOOD ACTRESS MOVIES
http://groups.google.com/group/sci.electronics.repair/t/6a51ddafd9789e54?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 5 2011 2:38 am
From: paypal cash

HOLLYWOOD ACTRESS ANGELINA JOLIE BEST MOVIES

FREE DOWNLOAD

VISIT http://movies.nadagam.com

==============================================================================
TOPIC: Black and While programs on Color Tv
http://groups.google.com/group/sci.electronics.repair/t/4832decd7595bba7?hl=en
==============================================================================

== 1 of 10 ==
Date: Tues, Apr 5 2011 3:09 am
From: JoseGomez@dotcom.com

How come some of the old B&W programs on the "Oldies Channel"
(THIS-TV) are black and white, while others are tinted, usually black
and greenish white. Yes, the color programs are accurately colored,
so it's not that the tv colors are off, and some B&W programs are
actually correct. Is this in the film or is the tv transmitter wrong?

== 2 of 10 ==
Date: Tues, Apr 5 2011 4:23 am
From: "William Sommerwerck"

> How come some of the old B&W programs on the "Oldies Channel"
> (THIS-TV) are black and white, while others are tinted, usually black
> and greenish white? Yes, the color programs are accurately colored,
> so it's not that the TV colors are off, and some B&W programs are
> actually correct. Is this in the film or is the tv transmitter wrong?

Filmed B&W programs are often transferred with a color camera or telecine
and transmitted as a color signal. The transfer equipment might not be set
up correctly.

It's also possible your TV's tracking is off, but you say some B&W programs
look okay, so that's not likely.

I occasionally watch this, and haven't noticed any unusual color casts in
B&W shows ("Bat Masterson", "Sea Hunt", etc).

I've noticed something similar on Blu-rays, both color and B&W. Scenes
appearing in the supplemental material have a different color balance or
cast, even though they're presumably derived from the same source. "North by
Northwest" and "Young Frankenstein" are good examples.

== 3 of 10 ==
Date: Tues, Apr 5 2011 4:46 am
From: Allodoxaphobia

On Tue, 05 Apr 2011 05:09:24 -0500, JoseGomez@dotcom.com wrote:
> How come some of the old B&W programs on the "Oldies Channel"
> (THIS-TV) are black and white, while others are tinted, usually black
> and greenish white. Yes, the color programs are accurately colored,
> so it's not that the tv colors are off, and some B&W programs are
> actually correct. Is this in the film or is the tv transmitter wrong?

Could it be that these are programs/movies that were 'colorized' in the
very early days of that process -- which rendered ghastly results IMO,
and which have simply never been re-colorized with new techniques?

Jonesy

== 4 of 10 ==
Date: Tues, Apr 5 2011 5:32 am
From: "William Sommerwerck"

> On Tue, 05 Apr 2011 05:09:24 -0500, JoseGomez@dotcom.com wrote:

>> How come some of the old B&W programs on the "Oldies Channel"
>> (THIS-TV) are black and white, while others are tinted, usually black
>> and greenish white. Yes, the color programs are accurately colored,
>> so it's not that the tv colors are off, and some B&W programs are
>> actually correct. Is this in the film or is the tv transmitter wrong?

> Could it be that these are programs/movies that were 'colorized' in the
> very early days of that process -- which rendered ghastly results IMO,
> and which have simply never been re-colorized with new techniques?

No. No one would colorize an entire TV series, as the cost would be
outrageous.

The newer computer-controlled colorizings are excellent.

== 5 of 10 ==
Date: Tues, Apr 5 2011 9:49 am
From: "Michael A. Terrell"

JoseGomez@dotcom.com wrote:
>
> How come some of the old B&W programs on the "Oldies Channel"
> (THIS-TV) are black and white, while others are tinted, usually black
> and greenish white. Yes, the color programs are accurately colored,
> so it's not that the tv colors are off, and some B&W programs are
> actually correct. Is this in the film or is the tv transmitter wrong?

Neither. The color burst has to be turned off for B&W programming,
so the color killer circuit doesn't create artifacts. Stations used to
be very careful about this, but over the years some just don't bother
anymore.

--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.

== 6 of 10 ==
Date: Tues, Apr 5 2011 11:11 am
From: John Robertson

William Sommerwerck wrote:
>> How come some of the old B&W programs on the "Oldies Channel"
>> (THIS-TV) are black and white, while others are tinted, usually black
>> and greenish white? Yes, the color programs are accurately colored,
>> so it's not that the TV colors are off, and some B&W programs are
>> actually correct. Is this in the film or is the tv transmitter wrong?
>
> Filmed B&W programs are often transferred with a color camera or telecine
> and transmitted as a color signal. The transfer equipment might not be set
> up correctly.
>
> It's also possible your TV's tracking is off, but you say some B&W programs
> look okay, so that's not likely.
>
> I occasionally watch this, and haven't noticed any unusual color casts in
> B&W shows ("Bat Masterson", "Sea Hunt", etc).
>
> I've noticed something similar on Blu-rays, both color and B&W. Scenes
> appearing in the supplemental material have a different color balance or
> cast, even though they're presumably derived from the same source. "North by
> Northwest" and "Young Frankenstein" are good examples.
>
>

Also an artifact of NTSC - Never The Same Colour -

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

== 7 of 10 ==
Date: Tues, Apr 5 2011 12:03 pm
From: "William Sommerwerck"

> Also an artifact of NTSC -- Never The Same Colour

Not true. NTSC is neither inherently inaccurate or unstable.

In any case, I think this is digital, and doesn't used NTSC encoding.

== 8 of 10 ==
Date: Tues, Apr 5 2011 2:17 pm
From: "Ian Field"

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:infp1h$k9v$1@dont-email.me...
>> Also an artifact of NTSC -- Never The Same Colour
>
> Not true. NTSC is neither inherently inaccurate or unstable.

The UK PAL (Phase Alternate Line) inverts the subcarrier phase on alternate
lines so phase distortion during transmission cancells itself out - NTSC
doesn't and is inherently prone to drift, hence it was dubbed; Never Twice
the Same Colour.

Aparently the US military incorporated a swinging phase error in their GPS
satelites to stop all and sundry using it without the decoding key - it was
a British engineer that cracked it using a technique based on PAL
technology.

== 9 of 10 ==
Date: Tues, Apr 5 2011 3:14 pm
From: Andrew Rossmann

article <rfqlp6htd9l3135fk6a47rtfd56d05hng1@4ax.com>,
JoseGomez@dotcom.com says...
>
> How come some of the old B&W programs on the "Oldies Channel"
> (THIS-TV) are black and white, while others are tinted, usually black
> and greenish white. Yes, the color programs are accurately colored,
> so it's not that the tv colors are off, and some B&W programs are
> actually correct. Is this in the film or is the tv transmitter wrong?

It may be the source material, too. These days, most everything is
digital, even what the stations play from probably comes off of a
computer.

You don't mention where you are. ThisTV is from Weigel Communications,
which is based in Chicago and broadcasts on WCIU (ThisTV is 26.5). One
of the technicians (hvs10trk) is a regular on this forum:
http://www.avsforum.com/avs-vb/showthread.php?t=815397

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.comcast.net/~andyross

== 10 of 10 ==
Date: Tues, Apr 5 2011 3:23 pm
From: "William Sommerwerck"

>>> Also an artifact of NTSC -- Never The Same Colour

>> Not true. NTSC is neither inherently inaccurate or unstable.

> The UK PAL (Phase Alternate Line) inverts the subcarrier phase
> on alternate lines so phase distortion during transmission cancels
> itself out - NTSC doesn't and is inherently prone to drift, hence it
> was dubbed; Never Twice the Same Colour.

Drift of /what/? I've wasted many hours explaining why NTSC is, overall,
better than PAL.

The US video distribution system never had much trouble with phase errors.
European systems did.

==============================================================================
TOPIC: Foregoing warranty rights
http://groups.google.com/group/sci.electronics.repair/t/db33289fb500ca5c?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 5 2011 4:25 am
From: "William Sommerwerck"

> Only helium and neon will diffuse through glass.

This is way OT, but Chicago Miniature Lamp claimed that helium diffusion
shortened the life of incandescent lamps.

==============================================================================
TOPIC: Speaker Crossover Wiring : Solve the Puzzle
http://groups.google.com/group/sci.electronics.repair/t/9ce83c1fb5063b0f?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 5 2011 7:14 am
From: boardjunkie1

On Apr 2, 6:09 am, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
> "Chris F." <zappy...@hotmail.com> wrote in message
>
> news:4d961d4e$0$3983$9a566e8b@news.aliant.net...
>
>
>
>
>
>
>
>
>
> > I should note that L1 and L2 both measure about 1 ohm.
>
> > "Chris F." <zappy...@hotmail.com> wrote in message
> >news:4d961cda$0$3982$9a566e8b@news.aliant.net...
> >> Someone brought me an old Wharfedale model W-90 monitor speaker, a
> >> massive old beast with two highs, two midranges, and two 15" woofers. The
> >> problem was that the crossover circuits are damaged; two 50 ohm
> >> potentiometers were burned up, and someone had attempted to bypass them,
> >> getting the wiring mixed up in the process. I've drawn up a diagram of
> >> the components, numbering each component lead rather than show how they
> >> were hooked up. You can view the diagram here:
>
> >>http://s282.photobucket.com/albums/kk275/packrat79/?action=view&curre...
>
> >> I'm hoping that someone can figure out the arrangement, and rather than
> >> have to draw up a schematic for me, you can just point out which numbers
> >> to connect.
> >> Some notes:
> >> -the connections between the high and midrange speakers appear to be
> >> original, though I cannot be certain
> >> -the woofers are presently connected in series (each measures 4 ohms)
> >> -values of the other components are as follows:
> >> C1 - 25 uF 50VDC
> >> C2 - 12 uF 25VAC (much larger than C1)
> >> L1, L2 - values unknown, but both look identical
> >> VR1, VR2 - 50 ohms, 5 watts wirewound
>
> >> I played around for a while and was able to achieve a decent sound with
> >> the following configuration: 1-3-8-13, 2-18-24, 22-23, 4-5, 7-17, 9-10,
> >> 11-19, 14-21. This doesn't seem right though, since only two leads of
> >> each pot are used, and L2 isn't used at all....
> >> Any help with this would be appreciated.
>
> The 'L' elements of crossovers are often in parallel with the speakers
> rather than series, and may be combined with a 'C'. There are, however, many
> different configurations of crossovers, so it's virtually impossible to
> guide you with any certainty. As to the pots, they could have been for
> level, or phase adjustment. My money would be on level, in which case only
> two legs being in use - i.e. with the pots connected as variable resistors,
> one in series with the two tweeters in parallel, and one with the two mids
> in parallel - would be the expected configuration.
>
> If you put "passive three way crossover designs" into Google, you will get
> an information overload on them, that you might be able to pick the bones
> out of to decide on what your design originally was or needs to be.
>
> Arfa

I'd ask around at Audio Karma. Someone may have a set of those and
could trace the wiring for you.

==============================================================================
TOPIC: How-To: Common Cause Of Flat Panel PS Failure
http://groups.google.com/group/sci.electronics.repair/t/ff5b6703ec041dcc?hl=en
==============================================================================

== 1 of 3 ==
Date: Tues, Apr 5 2011 9:43 am
From: "Michael A. Terrell"

Bob Villa wrote:
>
> On Apr 4, 6:31 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> wrote:
> > Bob Villa wrote:
> >
> > > On Apr 1, 6:51 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> > > wrote:
> > > > Bob Villa wrote:
> >
> > > > > On Mar 31, 6:20 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> > > > > wrote:
> >
> > > > > > > Hey Mike when can I expect this PSU to fail...a few years from now?
> > > > > > > Thanks for your gracious responses.
> >
> > > > > > When can you post a real question?
> >
> > > > > Alas, the mastertech doesn't understand sarcasm.
> >
> > > > You can't even do sarcasm well, and I'm not being sarcastic.
> >
> > > > --
> > > > You can't fix stupid. You can't even put a Band-Aid on it, because it's
> > > > Teflon coated.
> >
> > > The only thing you do well...other than being a critic...is please
> > > yourself.
> >
> > Yawn. I built KU band communications equiment that is aboard the
> > ISS, and all you do is whine.
> >
> > --
> > You can't fix stupid. You can't even put a Band-Aid on it, because it's
> > Teflon coated.
>
> Holy Crap! I must have cut you deep...now you need to brag. I am so
> impressed...especially how you belittle people instead of helping
> them.

Sigh. You don't want help. You were bragging about your 'fix'. I
have helped thousands of people over the last 45 years, but only those
that wanted help.

--
You can't fix stupid. You can't even put a Band-Aid� on it, because it's
Teflon coated.

== 2 of 3 ==
Date: Tues, Apr 5 2011 10:15 am
From: Bob Villa

On Apr 5, 11:43 am, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:
> Bob Villa wrote:
>
> > On Apr 4, 6:31 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> > wrote:
> > > Bob Villa wrote:
>
> > > > On Apr 1, 6:51 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> > > > wrote:
> > > > > Bob Villa wrote:
>
> > > > > > On Mar 31, 6:20 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> > > > > > wrote:
>
> > > > > > > > Hey Mike when can I expect this PSU to fail...a few years from now?
> > > > > > > > Thanks for your gracious responses.
>
> > > > > > > When can you post a real question?
>
> > > > > > Alas, the mastertech doesn't understand sarcasm.
>
> > > > > You can't even do sarcasm well, and I'm not being sarcastic.
>
> > > > > --
> > > > > You can't fix stupid. You can't even put a Band-Aid on it, because it's
> > > > > Teflon coated.
>
> > > > The only thing you do well...other than being a critic...is please
> > > > yourself.
>
> > > Yawn. I built KU band communications equiment that is aboard the
> > > ISS, and all you do is whine.
>
> > > --
> > > You can't fix stupid. You can't even put a Band-Aid on it, because it's
> > > Teflon coated.
>
> > Holy Crap! I must have cut you deep...now you need to brag. I am so
> > impressed...especially how you belittle people instead of helping
> > them.
>
> Sigh. You don't want help. You were bragging about your 'fix'. I
> have helped thousands of people over the last 45 years, but only those
> that wanted help.
>
> --
> You can't fix stupid. You can't even put a Band-Aid on it, because it's
> Teflon coated.

I researched the cause of common failures and related what I
found...all you needed to do was suggest using better/more appropriate
capacitors. Instead you and "Meatball" chose to belittle my effort.
My only thought in posting was that someone else might fix their flat
panel and save it from the trash.
Good Day Sir!

== 3 of 3 ==
Date: Tues, Apr 5 2011 1:05 pm
From: Meat Plow

On Tue, 05 Apr 2011 12:43:52 -0400, Michael A. Terrell wrote:

> Bob Villa wrote:
>>
>> On Apr 4, 6:31 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
>> wrote:
>> > Bob Villa wrote:
>> >
>> > > On Apr 1, 6:51 pm, "Michael A. Terrell"
>> > > <mike.terr...@earthlink.net> wrote:
>> > > > Bob Villa wrote:
>> >
>> > > > > On Mar 31, 6:20 pm, "Michael A. Terrell"
>> > > > > <mike.terr...@earthlink.net> wrote:
>> >
>> > > > > > > Hey Mike when can I expect this PSU to fail...a few years
>> > > > > > > from now? Thanks for your gracious responses.
>> >
>> > > > > > When can you post a real question?
>> >
>> > > > > Alas, the mastertech doesn't understand sarcasm.
>> >
>> > > > You can't even do sarcasm well, and I'm not being sarcastic.
>> >
>> > > > --
>> > > > You can't fix stupid. You can't even put a Band-Aid on it,
>> > > > because it's Teflon coated.
>> >
>> > > The only thing you do well...other than being a critic...is please
>> > > yourself.
>> >
>> > Yawn. I built KU band communications equiment that is aboard the
>> > ISS, and all you do is whine.
>> >
>> > --
>> > You can't fix stupid. You can't even put a Band-Aid on it, because
>> > it's Teflon coated.
>>
>> Holy Crap! I must have cut you deep...now you need to brag. I am so
>> impressed...especially how you belittle people instead of helping them.
>
>
> Sigh. You don't want help. You were bragging about your 'fix'. I
> have helped thousands of people over the last 45 years, but only those
> that wanted help.

Villa is a troll. He trolls alt.home.repair with the same bullshit.
Probably a few others too.

--
Live Fast Die Young, Leave A Pretty Corpse

==============================================================================
TOPIC: DTV question [minor]
http://groups.google.com/group/sci.electronics.repair/t/d8b62bf63e76e1c5?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 5 2011 11:30 am
From: David Nebenzahl

On 4/4/2011 10:18 PM stratus46@yahoo.com spake thus:

> On Apr 4, 3:32 pm, David Nebenzahl <nob...@but.us.chickens> wrote:
>
>> On 4/4/2011 2:29 PM Ian Field spake thus:
>>
>>> "David Nebenzahl" <nob...@but.us.chickens> wrote in message
>>> news:4d9a36ed$0$11893$822641b3@news.adtechcomputers.com...
>>>
>>>> On 4/4/2011 2:13 PM Ian Field spake thus:
>>>>
>>>>> "David Nebenzahl" <nob...@but.us.chickens> wrote in message
>>>>> news:4d9a3211$0$7784$822641b3@news.adtechcomputers.com...
>>>>>
>>>>>> Does someone here *actually know* how this information is
>>>>>> handled, propagated, etc?
>>>>>
>>>>> Various DVB-T faults get discussed on uk.tech.digital-tv so
>>>>> you could try asking there.
>>>>
>>>> You use the term "DVB-T" as if that's supposed to mean
>>>> something to me. I'd never heard this term before.
>>>>
>>>> OK, so it appears to be a *prospective* worldwide DTV
>>>> standards-setting body. (Looks suspiciously like yet another
>>>> Euro-standard being pushed on us, but never mind.)
>>>>
>>>> But is this even applicable to the US? Not sure, even after
>>>> reading this, with no mention of DVB-T applying to us:
>>>>
>>>> http://www.dvb.org/about_dvb/dvb_worldwide/usa
>>>>
>>>> In any case, I'm still looking forward to someone *here* who
>>>> has at least an inkling of how textual program information is
>>>> handled *here* (the US, where I live).
>>>
>>> You don't seem very grateful for the attempts to help you, so I
>>> think I've reached the limit of what I can do for you.
>>
>> Well, you haven't been very helpful, so I guess we're even.
>
> Go read this as it should help you get started.
>
> http://en.wikipedia.org/wiki/PSIP

Thank you. You win the "first person to actually provide useful
information in this whole damn thread" award.

--
The current state of literacy in our advanced civilization:

yo
wassup
nuttin
wan2 hang
k
where
here
k
l8tr
by

- from Usenet (what's *that*?)

==============================================================================
TOPIC: LM13700 als variabler Widerstand
http://groups.google.com/group/sci.electronics.repair/t/8e245b6263fb6095?hl=en
==============================================================================

== 1 of 2 ==
Date: Tues, Apr 5 2011 2:05 pm
From: Stefan Huebner

Moin zusammen,

mal wieder ein bisschen Steinzeit-Elektronik :)
In einem Geräuschgenerator (Synthesizer) wurden einige 13700 verbaut,
daher werde ich einen zusätzlichen VCA-Zweig nun auch damit realisieren.
Den Pegel, den ich an einer Stelle mit einem der OTAs anhebe, muss ich
später wieder dämpfen. Bisher ist an der Stelle ein schaltbarer
Abschwächer einfachster Bauform (=Spannungsteiler, bei dem der untere
Widerstand zu- oder abgeschaltet wird) eingebaut, meine Idee wäre, den
Widerstand mit einem lt. Datenblatt als variable resistor geschalteten
1/2 13700 zu ergänzen und soweit nötig die Kennlinie ein bisschen
hinzubiegen.
Ich verspreche mir davon anständigen Gleichlauf und vor allem eine
bessere Linearität als mit einem FET als steuerbaren Widerstand.
Hat da einer von euch eine Meinung zu?
Mein letzter nicht als Ersatzteil verbauter OTA war 2002 :)

== 2 of 2 ==
Date: Tues, Apr 5 2011 2:06 pm
From: Stefan Huebner

Sorry, wrong news group. Should have gone to de.sci.electronics.

If anyone of those reading here has good or bad experiences with the
LM13700 OTA as variable resistor in a voltage divider circuit, please
let me know!

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