Searching \ for '[EE]: Servo Schematic' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/io/servo/index.htm?key=servo
Search entire site for: 'Servo Schematic'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: Servo Schematic'
2001\07\16@224655 by Dan Michaels

flavicon
face
Related to the other thread, about driving servos, does
anyone happen to have an actual schematic for the internal
electronics for a 3-pin, RC-model type servo?

thanks,
- dan michaels
http://www.oricomtech.com
=========================

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\07\16@230810 by Alexandre Domingos F. Souza

flavicon
face
>Related to the other thread, about driving servos, does
>anyone happen to have an actual schematic for the internal
>electronics for a 3-pin, RC-model type servo?

       Here you are

       http://www.seattlerobotics.org/encoder/200009/S3003C.html


---8<---Corte aqui---8<----

Alexandre Souza
spam_OUTtaitoTakeThisOuTspamterra.com.br
http://planeta.terra.com.br/lazer/pinball/

---8<---Corte aqui---8<----

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\07\17@094739 by miked

flavicon
face
I probably have one for an old ACE servo. ACE provided complete
schematics/theory of operation of all their radio equipment(since many were kits)
and you could order every part/component.They used the Signetics NE544 as most
all servos of the 70's-80's did. According to  https://www.fmadirect.com/home.htm
all of todays servos use the same Mitsubishi chip but I don't know if it emulates the
old Signetics chip.
I also have a book with circuits from 60's-70's
>
> Related to the other thread, about driving servos, does
> anyone happen to have an actual schematic for the internal
> electronics for a 3-pin, RC-model type servo?
>
> thanks,
> - dan michaels
> http://www.oricomtech.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@101242 by Dale Botkin

flavicon
face
On Tue, 17 Jul 2001, Mike DeMetz wrote:

>  I probably have one for an old ACE servo. ACE provided complete
> schematics/theory of operation of all their radio equipment(since many were kits)
> and you could order every part/component.They used the Signetics NE544 as most
> all servos of the 70's-80's did. According to  https://www.fmadirect.com/home.htm
> all of todays servos use the same Mitsubishi chip but I don't know if it emulates the
> old Signetics chip.
>  I also have a book with circuits from 60's-70's
> >
> > Related to the other thread, about driving servos, does
> > anyone happen to have an actual schematic for the internal
> > electronics for a 3-pin, RC-model type servo?

Actually I have seen two different chip types in the last few months.
One (Airtronics) uses a single IC, the other (Futaba) uses a pair, one
servo logic/timing and one H-bridge driver.  I found schematics of the
2-chip version on a robotics page -- don't have it with me, but I think
it was the PARTS web site (Portland Area Robotics Society, I think), which
is a really cool place to visit.

Dale
--
A train stops at a train station.  A bus stops at a bus station.
On my desk I have a workstation...

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@101447 by Dale Botkin
flavicon
face
On Tue, 17 Jul 2001, Mike DeMetz wrote:

>  I probably have one for an old ACE servo. ACE provided complete
> schematics/theory of operation of all their radio equipment(since many were kits)
> and you could order every part/component.They used the Signetics NE544 as most
> all servos of the 70's-80's did. According to  https://www.fmadirect.com/home.htm
> all of todays servos use the same Mitsubishi chip but I don't know if it emulates the
> old Signetics chip.
>  I also have a book with circuits from 60's-70's

Almost forgot o mention -- I have some old NE544's if anyone wants to play
with them.  A very kind Signetics rep sent me a dozen or so back in bout
'90, thy've never made it out of the antistatic foam.

Dale
--
A train stops at a train station.  A bus stops at a bus station.
On my desk I have a workstation...

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@105347 by Dan Michaels

flavicon
face
Alexandre Souza wrote:
>>Related to the other thread, about driving servos, does
>>anyone happen to have an actual schematic for the internal
>>electronics for a 3-pin, RC-model type servo?
>
>        Here you are
>
>        http://www.seattlerobotics.org/encoder/200009/S3003C.html
>

Alexandre, mucho gratias. That is exactly the same pcb as inside the
servo I have. The schematic shows an unknown cap across the motor,
plus 2 15K resistors, but these appear to be wired in a speed sensing
ckt. The cap must be the noise suppressor here.


thanks,
- dan michaels
http://www.oricomtech.com
=========================

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@110805 by rottosen

flavicon
face
Dan:
The Signetics data books I have show the NE544 the schematic for its
use. There is also application note AN133 that gives more detail on how
to use the chip. Very informative.

If you can't find the data elsewhere then I can scan it for you.


-- Rich



Dan Michaels wrote:
{Quote hidden}

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@132939 by Dan Michaels

flavicon
face
Rich Ottosen wrote:
>Dan:
>The Signetics data books I have show the NE544 the schematic for its
>use. There is also application note AN133 that gives more detail on how
>to use the chip. Very informative.
>
>If you can't find the data elsewhere then I can scan it for you.
>

Many thanks to Mike and Dale and Rich for your responses.

Alexandre's link provided the schematic for the exact servo I have,
Futaba S3003. It uses one BAL6686 h-bridge and one BA6688 servo control
chip. I assume the 6686 has clamp diodes built-in, but I'll have to see
if I can find the specs. Other than that, it looks like the only
built-in noise suppressor is a cap across the motor - value unknown.

I guess I don't need an NE544 datasheet, but it would be interesting
to know what sort of noise filters might be present in the servos
that use that chip.

I think Drew might also use some help in designing a good filter for
his servo problem on the other thread.

thanks,
- dan michaels
http://www.oricomtech.com
=========================

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@140118 by gaston.gagnon

face
flavicon
face
Thanks for you well formulated question Dan that brought the right answer.
I have been looking for the H-Bridge of this type of servo for a very long time :))

Trough Alexandre's link I have found that both circuits BAL6686 and BA6688 are available from
www.angelfire.com/biz/techsonic/page2.html.
The BAL6686 is also available from Futaba for 3.75USD

Thank you guys,
Gaston.

Dan Michaels wrote:
{Quote hidden}

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@141009 by gaston.gagnon

face
flavicon
face
Does everybody receive my message in two copies ?
If so, can someone tell me why is this.
I am using Netscape Communicator 4.73

Regards,
Gaston.


Gaston Gagnon wrote:
{Quote hidden}

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@145421 by Dan Michaels

flavicon
face
>
>Gaston Gagnon wrote:
>>
>> Thanks for you well formulated question Dan that brought the right answer.
>> I have been looking for the H-Bridge of this type of servo for a very
long time :))
>>
>> Trough Alexandre's link I have found that both circuits BAL6686 and
BA6688 are available from
>> www.angelfire.com/biz/techsonic/page2.html.
>> The BAL6686 is also available from Futaba for 3.75USD
>>
>> Thank you guys,
>> Gaston.
>>


Gaston, I could not get that link to work, nor the search engine at
Rohm. I am sure these Rohm parts, but could not find the parts mucking
around the website:

http://www.rohm.com/products/shortform/11motor/motor1.html

thanks,
- dan michaels
http://www.oricomtech.com
=========================

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\17@151256 by gaston.gagnon

face
flavicon
face
Dan if you are referring to this link,
       www.angelfire.com/biz/techsonic/page2.html
and you are using Netscape communicator, there seems to be nothing after

"Here is our partial listing for Semiconductors:
Please click here to order on-line"

but if you persist and go way down the page, after many blank lines, you will see the list of parts
with unit price and quantity 1-10.
Opera browser shows the list where you would expect it.

Gaston.

Dan Michaels wrote:
{Quote hidden}

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\07\18@144328 by Peter L. Peres

picon face
I have a schematic I can't send over, but I'll tell you it won't help you.
It uses a custom-ordered servo chip and a few passives. The chip is DIP8
with no heatsink.

You may have better luck hunting for datasheets of said chips (they come
with application schematics). National had the 'original' integrated
drivers, at least 15 years ago. Try an old National special purpose
catalog. They do describe the internals a little afair.

There is nothing they can do that a 12C508A can't do, except the power
driver. Normal servo chips have H bridges that can run 1A at 4V supply
with little losses (<1W).

Peter

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...