Hi, I want to design adjustable timer for my application..I am using a 555 timer for that purpose.can a 555 timer drives the relay directly if i connect the 555 in monostable mode and relay at the ouput of the 3rd pin of 555..need help about 555 timer..
- Thread starter harikanaidu
- Start date
Hi, I want to design adjustable timer for my application..I am using a 555 timer for that purpose.can a 555 timer drives the relay directly if i connect the 555 in monostable mode and relay at the ouput of the 3rd pin of 555..
DickCappels
- Joined Aug 21, 2008
- 9,869
You might want to add the diode to prevent the flyback current in the relay from flowing backwards through the '555 output. Some versions of the '555 might be damaged without it.
Source of above: http://www.electroschematics.com/7103/555-tlc555-relay-driver-circuit/
Source of above: http://www.electroschematics.com/7103/555-tlc555-relay-driver-circuit/
thankyou so much
I am using NE555 timer..and relay used is 12v relay
version of 555 means?You might want to add the diode to prevent the flyback current in the relay from flowing backwards through the '555 output. Some versions of the '555 might be damaged without it.
Source of above: http://www.electroschematics.com/7103/555-tlc555-relay-driver-circuit/
The NE555 can supply 200 ma but you did not tell the current your relay uses. You told the voltage.
DickCappels
- Joined Aug 21, 2008
- 9,869
Not all '555's are of the same design. Some might be more sensitive to this reverse current flow than others. As I recall, the original intersil application booklet indicated that this diode is a good idea for their (original) version of the NE555.
Can you just tell me what are the other version of 555 other than NE555..
Can you please tell me how to know the current required by the relay...It is not present in the datasheet even
Try Google 12V 0.36W 30ma
