Alt-BEAM Archive
Message #13759
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter wilf.rigter@powertech.bc.ca
Date: Thu, 20 Apr 2000 15:20:47 -0700
Subject: RE: Servo Controler
Sure a 74HC14 is fine, after all it's basically a 2Nv grounded bicore
circuit. It may require slightly different caps if you run out of timing
adjustment. A 4069 hex inverter (metal gate CMOS) would probably work fine
too. Here is an even simpler solution with the 139 output pin functions
changed so that the A and B inputs can be hooked straight to a microcore.
Note the use of the 139 output 3 for the "hold" position function.
regards
wilf
> <>
> -----Original Message-----
> From: Richard Piotter [SMTP:richfile@rconnect.com]
> Sent: Thursday, April 20, 2000 2:01 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: Servo Controler
>
> So it has to be HC/HCT? NUTS!!!
>
> Will the 74HC14 work in place of the 74HC04? The school doesn't have the
> HC version in the parts shelves.
>
>
>
> Wilf Rigter wrote:
> >
> > Yup, a 74HC04 works like a HC240 but doesn't have tristate or (much)
> motor
> > drive capability. Use it for oscillators, bicores, etc.
> > Of course don't use 74LS/ALS/F/S04 etc which all suck too much power and
> are
> > not compatible with large input resistors..
> >
> > wilf
> >
> > > -----Original Message-----
> > > From: Richard Piotter [SMTP:richfile@rconnect.com]
> > > Sent: Thursday, April 20, 2000 10:10 AM
> > > To: beam@sgiblab.sgi.com
> > > Subject: Re: Servo Controler
> > >
> > > Just one question? You can use the 7404 like that? Didn't realize
> that!
> > > I'll have to grab a couple & expiriment.
> > >
> > > Wilf Rigter wrote:
> > > >
> > > > Try this for less parts
> > > >
> > > > <>
> > > >
> > > > The binary inputs IN1 and IN2 control the PWM as follows.
> > > >
> > > > 0 0 = CW
> > > > 1 0 = CENTER
> > > > 0 1 = CCW
> > > > 1 1 = HOLD
> > > >
> > > > The HOLD function forces the PWM output low and the servo will
> remain in
> > > > it's present position for a short while.
> > > > Raising the ENABLE line high forces the PWM output high and is
> probably
> > > not
> > > > very useful.
> > > >
> > > > wilf
> > > >
> > > > > -----Original Message-----
> > > > > From: Richard Piotter [SMTP:richfile@rconnect.com]
> > > > > Sent: Wednesday, April 19, 2000 9:20 PM
> > > > > To: Twin Cities Robotics Group; BEAM
> > > > > Subject: Servo Controler
> > > > >
> > > > > Does this circuit look decent?
> > > > >
> > > > > 1x 74HC14 (6 inverter gates)
> > > > > 1x 74xx00 (3 NAND gates)
> > > > > 1x 74xx08 (2 AND gates)
> > > > > 3x Silicon Switching Diodes
> > > > > 3x Multiturn Potentiometer
> > > > > 2x Small Value Resistors
> > > > > 2x Capacitors
> > > > >
> > > > > ___
> > > > > ,----|>o--| \
> > > > > | | |o--|<--o--/\/\/---.
> > > > > | o--|>o--|___/ | ^ |
> > > > > | | |____| |
> > > > > | | ___ |
> > > > > o----|>o--| \ |
> > > > > | | | |o--|<--o--/\/\/---o
> > > > > | o-------|___/ | ^ |
> > > > > In | | |____| |
> > > > > A | | ___ |
> > > > > O--o---------| \ |
> > > > > | | | |o--|<--o--/\/\/---o
> > > > > O----o--|>o--|___/ | ^ |
> > > > > In | | |____| |
> > > > > B | | ___ |
> > > > > o---------| \ |
> > > > > | | |--. |
> > > > > '-------|___/ | ,--/\/\/--o--/\/\/--.
> > > > > | | |
> > > > > | o----|>o-----||-----o
> > > > > ___ | | |
> > > > > / |--' '-----||--o--o<|----'
> > > > > O------------| | |
> > > > > Servo \___|------------------'
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > >
> > > > >
> > > > > Richard Piotter The Richfiles Robotics & TI web page:
> > > > > richfile@rconnect.com http://richfiles.calc.org
> > > > >
> > > > > -- Make Money by Simply Surfing the Net or responding to E-Mail!!!
> > > > > -- Click below!!!
> > > > >
> > > > > http://www.alladvantage.com/go.asp?refid=ATL147
> > > > >
> http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630
> > > >
> > > >
> > >
> ------------------------------------------------------------------------
> > > > Name: SERVOLOGIC.gif
> > > > SERVOLOGIC.gif Type: GIF Image (image/gif)
> > > > Encoding: base64
> > >
> > > --
> > >
> > >
> > > Richard Piotter The Richfiles Robotics & TI web page:
> > > richfile@rconnect.com http://richfiles.calc.org
> > >
> > > -- Make Money by Simply Surfing the Net or responding to E-Mail!!!
> > > -- Click below!!!
> > >
> > > http://www.alladvantage.com/go.asp?refid=ATL147
> > > http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630
>
> --
>
>
> Richard Piotter The Richfiles Robotics & TI web page:
> richfile@rconnect.com http://richfiles.calc.org
>
> -- Make Money by Simply Surfing the Net or responding to E-Mail!!!
> -- Click below!!!
>
> http://www.alladvantage.com/go.asp?refid=ATL147
> http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630
13760 Thu, 20 Apr 2000 19:00:12 -0400 Re: Best wheels?
> ive got some lego wheels that werk greaton low or high torque motors. ill
> sell them for 10c a peice.
>
>
>
> jay z
>
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