Stamp to MOSFET help
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Posts: 46,084
I have an application that requires switching a five amp load from a
Javelin. From what I've read, it seems that a MOSFET will do the job
quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
There will be two such sources. I want to use two MOSFETs with the
ground ends connected and grounded through a 10 amp/100 mv current
shunt, the voltage of which will be monitored by the Javelin. The
load will be some number of incandescent lamps.
My questions are:
1. What MOSFET is suitable?
2. How do I drive the gates of the MOSFETs from the stamp? That is,
should I use a transistor or optoisolator?
3. Are there any example circuits available on-line?
Russ
Javelin. From what I've read, it seems that a MOSFET will do the job
quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
There will be two such sources. I want to use two MOSFETs with the
ground ends connected and grounded through a 10 amp/100 mv current
shunt, the voltage of which will be monitored by the Javelin. The
load will be some number of incandescent lamps.
My questions are:
1. What MOSFET is suitable?
2. How do I drive the gates of the MOSFETs from the stamp? That is,
should I use a transistor or optoisolator?
3. Are there any example circuits available on-line?
Russ
Comments
In a message dated 1/21/2004 3:10:06 PM Pacific Standard Time,
home.rr@c... writes:
I have an application that requires switching a five amp load from a
Javelin. From what I've read, it seems that a MOSFET will do the job
quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
There will be two such sources. I want to use two MOSFETs with the
ground ends connected and grounded through a 10 amp/100 mv current
shunt, the voltage of which will be monitored by the Javelin. The
load will be some number of incandescent lamps.
My questions are:
1. What MOSFET is suitable?
2. How do I drive the gates of the MOSFETs from the stamp? That is,
should I use a transistor or optoisolator?
3. Are there any example circuits available on-line?
Russ
[noparse][[/noparse]Non-text portions of this message have been removed]
> www.glitchbuster.com
>
>
>
> In a message dated 1/21/2004 3:10:06 PM Pacific Standard Time,
> home.rr@c... writes:
> I have an application that requires switching a five amp load from a
> Javelin. From what I've read, it seems that a MOSFET will do the job
> quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
> There will be two such sources. I want to use two MOSFETs with the
> ground ends connected and grounded through a 10 amp/100 mv current
> shunt, the voltage of which will be monitored by the Javelin. The
> load will be some number of incandescent lamps.
>
> My questions are:
>
> 1. What MOSFET is suitable?
> 2. How do I drive the gates of the MOSFETs from the stamp? That is,
> should I use a transistor or optoisolator?
> 3. Are there any example circuits available on-line?
>
> Russ
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
I don't see your reply. Can you try again without portions that will
be "removed"?
Russ
For the switching of this type of load, take a closer look at the
www.parallax.com -> Products -> Industrial page.
http://www.parallax.com/html_pages/products/industrial/industrial.asp
The products on this page are designed to provide BASIC Stamps (or the
Javelin Stamp) with control over and isolation from larger loads. Each
product page has links to documentation for the device, and they are
pretty informative and may also provide other useful leads. It will be
important to closely examine the specs and theory of operation for each
device before making your selection. Most of these boards are designed
to control relays that in turn control switches. These relays must also
be selected to meet the design/load requirements.
Some of the boards on this page also have prototyping areas that you can
use to set up an analog to digital converter (ADC) to measure the
voltage across your shunt resistor. Optocouplers can be used between
the BASIC or Javelin Stamp's I/O pins and the serial communication lines
to isolate the controller.
Regards, Andy
Andy Lindsay
Parallax, Inc.
Original Message
From: russranshaw [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nf07a7bN5p4SqfQYoURNzWke6_dZbEL7oazTDHEiyRa6uVKoV9s27FabzqInconpHNwxwSudsVDkjg]home.rr@c...[/url
Sent: Wednesday, January 21, 2004 12:03 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Stamp to MOSFET help
I have an application that requires switching a five amp load from a
Javelin. From what I've read, it seems that a MOSFET will do the job
quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
There will be two such sources. I want to use two MOSFETs with the
ground ends connected and grounded through a 10 amp/100 mv current
shunt, the voltage of which will be monitored by the Javelin. The load
will be some number of incandescent lamps.
My questions are:
1. What MOSFET is suitable?
2. How do I drive the gates of the MOSFETs from the stamp? That is,
should I use a transistor or optoisolator?
3. Are there any example circuits available on-line?
Russ
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built-in optocouplers that you can use the switch the gate on your power
MOSFET.
Andy
Original Message
From: Andy Lindsay
Sent: Thursday, January 22, 2004 10:22 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] Stamp to MOSFET help
Hi,
For the switching of this type of load, take a closer look at the
www.parallax.com -> Products -> Industrial page.
http://www.parallax.com/html_pages/products/industrial/industrial.asp
The products on this page are designed to provide BASIC Stamps (or the
Javelin Stamp) with control over and isolation from larger loads. Each
product page has links to documentation for the device, and they are
pretty informative and may also provide other useful leads. It will be
important to closely examine the specs and theory of operation for each
device before making your selection. Most of these boards are designed
to control relays that in turn control switches. These relays must also
be selected to meet the design/load requirements.
Some of the boards on this page also have prototyping areas that you can
use to set up an analog to digital converter (ADC) to measure the
voltage across your shunt resistor. Optocouplers can be used between
the BASIC or Javelin Stamp's I/O pins and the serial communication lines
to isolate the controller.
Regards, Andy
Andy Lindsay
Parallax, Inc.
Original Message
From: russranshaw [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8igbr6jHAUSmUZc76ukEeIyXcH3LXgAQn_AEUeuNmLotsftzgYP_tlziGTMiPcdkF8OUmTKCW2tA]home.rr@c...[/url
Sent: Wednesday, January 21, 2004 12:03 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Stamp to MOSFET help
I have an application that requires switching a five amp load from a
Javelin. From what I've read, it seems that a MOSFET will do the job
quite nicely. The source is a 50 to 100 vold DC positive wrt ground.
There will be two such sources. I want to use two MOSFETs with the
ground ends connected and grounded through a 10 amp/100 mv current
shunt, the voltage of which will be monitored by the Javelin. The load
will be some number of incandescent lamps.
My questions are:
1. What MOSFET is suitable?
2. How do I drive the gates of the MOSFETs from the stamp? That is,
should I use a transistor or optoisolator?
3. Are there any example circuits available on-line?
Russ
To UNSUBSCRIBE, just send mail to:
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from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
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This message has been scanned by WebShield. Please report SPAM to
abuse@p....
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Yahoo! Groups Links
To visit your group on the web, go to:
http://groups.yahoo.com/group/basicstamps/
To unsubscribe from this group, send an email to:
basicstamps-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to:
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This message has been scanned by WebShield. Please report SPAM to
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