Reed Switch
How does a magnetic laptop lid switch work?
All the circuit diagrams I try provide the opposite effect I’m looking for. Basically, I want to shut off the circuit when the lid is closed and activate it when the lid is open. Does it have anything to with a reed switch?
Hi There,
You are correct.
A magnetic reed switch is activated whenever it is in close proximity to a magnet.
There are some reed switches with two poles ( one closes and the other opens in the presence of a magnetic field). DPST
The other kind (normally open) are open but close in the presence of the magnetic field. SPST
The type you need is a normally closed magnetic reed switch that opens when the magnet is near. Or buy a DPST and use the normally closed contacts.
You can find magnetic reed switches at Radio Shack just explain what you need to the salesman.
Be sure the current is rated to handle the load or the switch will fail after a few operations.
Hope this helps,
Al
Homemade Brushless Motor (reed switch motor)
|
|
5 Recessed Alarm Contacts Door Window Reed Switch White $6.19 |
|
|
1 White Recessed Door Window Alarm Contacts Reed Switch $3.09 |
|
|
10 Recessed Door Window Security Alarm Reed Switch $16.99 |
|
|
10 Recessed BROWN Door Window Security Alarm Reed Switch Contact 3/8 push sensor $24.99 |
|
|
5 Recessed BROWN Door Window Security Alarm Reed Switch Contact 3/8 push sensor $13.99 |
|
|
1 Recessed BROWN Door Window Security Alarm Reed Switch Contact 3/8 push sensor $5.09 |
|
|
Sensaphone Magnetic Reed Switch Door or Window Monitor $13.95 |
|
|
5 Set Door Or Window Safety Contact Magnetic Alarm Reed Switch NO with Screws $5.89 |
|
|
5 SMD Security Window Door Magnetic Contact Reed Switches Alarm NO +Screws $5.89 |
|
|
10 Recessed Magnetic Contacts Reed Switch Sensor White $14.75 |
|
|
Burglar Alarm Recessed Sliding Door Window Sill Reed Switch Sensor Hidden Vivint $3.89 |
|
|
5PCS Recessed Alarm Contacts Door Window Reed Switch W $0.99 |
|
|
1 White Recessed Door Window Alarm Contacts Reed Switch $0.99 |
|
|
10x Recessed Magnetic Door Contacts Alarm Reed Switch $0.99 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.47 |
|
|
25 Recessed Door or Window Contacts Reed Switch Sensor $32.50 |
|
|
White Recessed Door Window Contacts Reed Switch Sensor $3.23 |
|
|
GRI Open Recessed Alarm Reed Switch Door Window Contact $5.25 |
|
|
Magnetic Recessed Contact Alarm Window 5X Reed Switch $6.59 |
|
|
GE Sentrol 5625W Shatter Point w/Magnetic, Reed Switch $24.95 |
|
|
White Door Window Contacts Magnetic Reed Switch Sensor $4.02 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.51 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $47.02 |
|
|
5pcs White Recessed Window Door Contacts Alarm Security Magnetic Reed Switch $6.99 |
|
|
Brown Wired Recessed Window Door Alarm Security Magnet Contact Reed Switch $3.99 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.17 |
|
|
5x Magnetic Door Recessed Contacts Alarm Reed Switch $6.59 |
|
|
White Recessed Door Window Contacts Reed Switch Sensor $4.06 |
|
|
Mount Surface Contact Switch Commercial Industrial Reed $11.80 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $47.02 |
|
|
White Inbuilt Type Alarm Contacts Door Window Reed Switch $3.32 |
|
|
AC 250V 0.5A Reed Magnet NC Switch Airflow Monitor for Axial Fan $47.00 |
|
|
1 GRI DSC Bosh tane magnet door alarm contact sensor reed switch Security window $3.99 |
|
|
10 magnetic door window alarm contact reed switch Security mini stick on DSC $14.98 |
|
|
5) Ademco Honeywell DSC Security magnetic door window alarm contact reed switch $7.99 |
|
|
5 magnetic door window contact reed switch Alarm Security mini ademco honeywell $7.99 |
|
|
1 Screw Mounting Recessed Alarm Contacts White Reed Switch for Window Alarm USA $3.99 |
|
|
AC 250V 0.5A Reed Magnet NC Switch Airflow Monitor for Axial Fan $46.45 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.67 |
|
|
Recessed Magnetic Door Window Contact Alarm Reed Switch $2.62 |
|
|
5 Recessed Door Recessed Door Jam Window Security Alarm Reed Switch Sensor Tane $8.00 |
|
|
5 SURFACE MOUNT ALARM DOOR WINDOW CONTACTS,REED SWITCH $9.50 |
|
|
50 Roller Ball Reed System Switch Contact Sensor Recessed Hidden Door Tane Style $50.00 |
|
|
White Inbuilt Type Alarm Contacts Door Window Reed Switch $3.31 |
|
|
10x Magnetic Door Window Contact Alarm Reed Switch New $11.29 |
|
|
AC 250V 0.5A Reed Magnet NC Switch Airflow Monitor for Axial Fan $46.38 |
|
|
Free Shipping 5x Magnetic Door Recessed Contacts Alarm Reed Switch $6.99 |
|
|
5x Door Window Contact SMD Magnetic Reed Switch Alarm $11.99 |
|
|
10x Door Window SMD Contact Magnetic Reed Switch Alarm Free Shipping $23.09 |
|
|
5x Magnetic Door Window Contact Alarm Reed Switch $6.51 |
|
|
High Quality 5x Door Window Contact Magnetic Reed Switch Alarm – SMD $4.50 |
|
|
Free Shipping Magnetic Recessed Contact Alarm Window 5X Reed Switch $6.99 |
|
|
Free Shipping Door Window Contact Magnetic Reed Switch Alarm – SMD $4.99 |
|
|
Concealed Switch Recessed Door Window Security Alarm Reed Ademco Tane DSC Hidden $15.00 |
|
|
10x Door Window Contact Magnetic Reed Switch Alarm SMD $20.73 |
|
|
10x Recessed Magnetic Door Contacts Alarm Reed Switch Free Shipping $11.59 |
|
|
10 Set Door Window Contact Magnetic Reed Switch Alarm $17.98 |
|
|
100 Set Door Window Contact Magnetic Reed Switch Alarm $129.99 |
|
|
20 Set Door Window Contact Magnetic Reed Switch Alarm $29.99 |
|
|
5 Set Door Or Window Contact Magnetic Reed Switch Alarm $9.99 |
|
|
50 Set Door Window Contact Magnetic Reed Switch Alarm $69.99 |
|
|
New Door Window Contact Magnetic Reed Switch Alarm Normal Open SMD Style +Screws $4.79 |
|
|
5PCS Recessed Alarm Contacts Door Window Reed Switch W Free Shipping $6.69 |
|
|
5 SMD NC Security Window Magnetic Contact Reed Switches Free Shipping $11.39 |
|
|
1 White Recessed Door Window Alarm Contacts Reed Switch Free Shipping $3.29 |
|
|
10″ Door Window Contact Magnetic Reed Switch Alarm SMD Free Shipping $4.39 |
|
|
10PCS Recessed Alarm Contacts Door Window Reed Switch W Free Shipping $12.39 |
|
|
Recessed Door Window Security Alarm Reed Switch bag 10 $16.90 |
|
|
Surface Mount Door Window Security Alarm Reed Switch Contact Bag of 10 $14.50 |
|
|
Door Window Contact Magnetic Reed Switch SMD Style 10″ $4.59 |
|
|
Recessed Plunger Ball Alarm Switch Reed W/Terminal 10x $19.60 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.14 |
|
|
New Door Window Contact Magnetic Reed Switch Alarm Normal Open SMD Style +Screws $4.39 |
|
|
2 Set Door Or Window Contact Magnetic Reed Switch Alarm $4.99 |
|
|
5 × Door Window Contact Magnetic Reed Switch SMD Style $11.39 |
|
|
5 SMD NC Security Window Magnetic Contact Reed Switches $11.99 |
|
|
Door/Window Safety Contact Magnetic Reed Switch Alarm $4.08 |
|
|
5 Security Window Magnetic Contact Reed Switches SMD NC $11.68 |
|
|
10 Surface Mount Door or Window Contacts, Reed Switch $14.75 |
|
|
50 Recessed Door Window Contacts Reed Switch Contact Wh $73.00 |
|
|
10 Surface Mount Door & Window Sensor Reed Switch $14.75 |
|
|
10 Recessed Plunger Ball Alarm Switch Reed W/Terminal $19.65 |
|
|
Overhead Alarm Contact Reed Switch Door Window Security $17.95 |
|
|
White Inbuilt Type Alarm Contacts Door Window Reed Switch $3.53 |
|
|
25 Recessed Door or Window Contacts Reed Switch Sensor $36.50 |
|
|
White Door Window Contacts Magnetic Reed Switch Sensor $4.03 |
|
|
White Inbuilt Type Alarm Contacts Door Window Reed Switch $4.03 |
|
|
10x Door Window SMD Contact Magnetic Reed Switch Alarm $23.09 |
|
|
White Inbuilt Type Alarm Contacts Door Window Reed Switch $7.34 |
|
|
White Door Window Contacts Magnetic Reed Switch Sensor $7.39 |
|
|
5x Door Window Contact Magnetic Reed Switch Alarm – SMD $12.09 |
|
|
5x Door Window Contacts Magnetic Reed Switch Alarm Normal Open Style Screws $2.89 |
|
|
5 Set Door Or Window Contact Magnetic Reed Switch Alarm $5.80 |
|
|
Reed Magnet NO Switch Plastic Airflow Monitor for Axial Fan $46.66 |
|
|
Door Window Contact Magnetic Reed Switch Alarm – SMD $4.29 |
|
|
10PCS Recessed Alarm Contacts Door Window Reed Switch W $11.99 |
|
|
Screws Mounting Recessed Alarm Contacts White Reed Switch for Window $3.93 |
|
|
White Recessed Door Window Contacts Reed Switch Sensor $4.07 |
|
|
Door/Window Recessed Magnetic Contact Reed Switch Alarm $3.29 |
|
|
5 SMD Security Window Door Magnetic Contact Reed Switches Alarm NC +Screws New $8.69 |
|
|
Switched on Classics $13.98 … |
|
|
Chicago Blues: A Quarter Century [3 DISC SET] $997.00 Chicago Blues: A Quarter Century! Japanese Import 3 CD Box Set! 71 Tracks!… |
|
|
Wayne ESP25 12-Volt 3300 Gallons Per Hour Battery Back Up Sump Pump System $223.88 The Wayne emergency backup sump pump moves up to 3300 GPH, 2300 GPH @ 10ft. lift and helps to protect your property when a storm knocks out power or when the main sump pump fails. U.S.A. Flow (GPH): 3,300, Volts: 12, Discharge Port (in.): 1 1/2, Power Cord (ft.): 6, Dimensions L x W x H (in.): 9 x 16 x 10… |
|
|
Honeywell Ademco 5816WMWH White Door / Window Transmitter w/ Magnet $19.99 White Door / Window Transmitter w/ Magnet, a two zone transmitter with built-in magnetic reed switches wired closed circuit contact loop… |
|
|
Honeywell 5816 Wireless Transmitter $20.95 Ademco Honeywell 5816 Door and Window Transmitter 5816 Wireless Two-zone Transmitter. Features a built-in reed switch and tamper. Includes battery. requires 1ea 5899 magnet. Two zone transmitter with both built-in magnetic reed switches and wired closed circuit contact loop. The 5816 Series of door and window transmitters provide the most reliable, convenient and cost effective solutions for secur… |
|
|
Crossed Swords $4.68 Based on Mark Twain’s “The Prince and the Pauper,” this adventure chronicles what happens when a royal youth switches places with his peasant double in Tudor England. As the commoner adjusts to a life of riches, his doppelganger struggles to live like ordinary folks do. But when the King suddenly dies, both men discover the consequences of their actions. Oliver Reed, Raquel Welch, Ernest Borgnine,… |
|
|
The Tycoon $1.99 … |
|
|
DOOMED $1.99 … |
|
|
MOEL SND UT 7^ REED SWITCH … |
|
|
Welch Allyn Model 58455-000 – Switch, Reed, 10 To 20 A Turns- $16.47 Welch Allyn Model 58455-000 – Switch, Reed, 10 To 20 A Turns-… |
This entry was posted on Friday, December 9th, 2005 at 10:35 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.