question about solenoids
Archiver
Posts: 46,084
i'm trying to control two 24vdc .250mA solenoids. i am using a
TIP120 transistor, but i was told that when the solenoids
deactivate they create a reverse spike and that i need to use a
"snubber" to deal with this problem. my question is where can i
get a snubber? any help is appreciated, thanks.
TIP120 transistor, but i was told that when the solenoids
deactivate they create a reverse spike and that i need to use a
"snubber" to deal with this problem. my question is where can i
get a snubber? any help is appreciated, thanks.
Comments
to the positive supply side of the coil, anode to the negative side of the
coil.
Ken
i'm trying to control two 24vdc .250mA solenoids. i am using a
TIP120 transistor, but i was told that when the solenoids
deactivate they create a reverse spike and that i need to use a
"snubber" to deal with this problem. my question is where can i
get a snubber? any help is appreciated, thanks.
[noparse][[/noparse]Non-text portions of this message have been removed]
knowledge, is that considered a snubber or simply a transient suppressor? I
always thought that snubbers were specifically designed to limit the rise
and fall time of a signal across a current sensitive component (like a
triac) for protection.
just curious,
d...
>
Original Message
> From: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hKawTeKF7s6uk7h-5cEhUY3ZvOYXz9dxZye19H6cBC5DsUHcQVw9rGFt91b42R7zP3UAB5F-]smartdim@a...[/url
> Sent: Tuesday, October 21, 2003 12:08 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] question about solenoids
>
>
> The snubber is simply a diode connected across the solenoid coil.
> The cathode
> to the positive supply side of the coil, anode to the negative
> side of the
> coil.
>
> Ken
>
>
> i'm trying to control two 24vdc .250mA solenoids. i am using a
> TIP120 transistor, but i was told that when the solenoids
> deactivate they create a reverse spike and that i need to use a
> "snubber" to deal with this problem. my question is where can i
> get a snubber? any help is appreciated, thanks.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> 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.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
see
http://www.maxim-ic.com/appnotes.cfm/appnote_number/848
I hope this won't end up getting too far off topic, but just for my own
knowledge, is that considered a snubber or simply a transient suppressor? I
always thought that snubbers were specifically designed to limit the rise
and fall time of a signal across a current sensitive component (like a
triac) for protection.
just curious,
d...
[noparse][[/noparse]Non-text portions of this message have been removed]
> i'm trying to control two 24vdc .250mA solenoids. i am using a
> TIP120 transistor, but i was told that when the solenoids
> deactivate they create a reverse spike and that i need to use a
> "snubber" to deal with this problem. my question is where can i
> get a snubber? any help is appreciated, thanks.
Check out the data sheet for the TIP120, it has an internal diode
just for what you describe.
http://www.onsemi.com/pub/Collateral/TIP120-D.PDF
bottom of page 3
Dave