October 1st, 2014 International Day of Older Persons October 2nd, 2014 International Day of Non-Violence October 4th, 2014 Feast of St Francis of Assisi October 4th, 2014 Yom Kippur October 5th, 2014 World Teachers' Day October 5th, 2014 Eid-al-Adha October 6th, 2014 World Habitat Day October 6th, 2014 Child Health Day October 8th, 2014 World Day for Natural Disaster Reduction October 9th, 2014 World Post Day October 9th, 2014 Leif Erikson Day October 9th, 2014 World Sight Day October 9th, 2014 First day of Sukkot October 10th, 2014 World Mental Health Day October 11th, 2014 International Day of the Girl Child October 13th, 2014 Indigenous People's Day October 13th, 2014 Columbus Day October 13th, 2014 Native Americans' Day October 15th, 2014 International Day of Rural Women October 15th, 2014 Last day of Sukkot October 15th, 2014 White Cane Safety Day October 16th, 2014 Shmini Atzeret/Simchat Torah October 16th, 2014 Boss's Day October 16th, 2014 World Food Day October 17th, 2014 'Alaska Day' observed October 17th, 2014 World Day for Poverty Eradication October 18th, 2014 Alaska Day October 23rd, 2014 Diwali/Deepavali October 24th, 2014 United Nations Day October 24th, 2014 World Development Information Day October 25th, 2014 Muharram/Islamic New Year October 27th, 2014 World Day for Audiovisual Heritage October 29th, 2014 World Stroke Day October 31st, 2014 Halloween October 31st, 2014 Nevada Day November 1st, 2014 All Saints November 1st, 2014 All Saints' Day
Click Here. Double your traffic. Get Vendio Gallery - Now FREE!
Built & Tested - Timer Relay Kit #1960
This is the Built & Tested Timer with Relay Kit. This circuit is designed to turn on a Relay for a definite time period and then the Relay will automatically turn off. The circuit is based on the LM555 Precision Timer that is triggered by a momentary switch contact. The switch may be a physical switch or it may be the ouput of other circuitry. There is also an on-board LED to indicate when the Relay is energized.
A normally-open switch is required for the Trigger. When the switch is open or not made, the Relay circuit is OFF and the Relay outputs are with the Com connected to the NC (Normally Closed) pin. When the Trigger input is momentarily connected to Ground, the Timer circuit will output a single pulse which will turn on the Relay for a certain time. This time is adjustable from a few seconds up to about half an hour. The Relay contacts will switch to Com connected to NO (Normally Open). After the time period is over, the Relay will turn back off. Once the Timer is triggered, additional trigger pulses will be ignored for the duration of the Timer pulse.
The circuit has been optimized for flexibility by providing for two Timing Capacitors to extend the time period, if desired. Only 1 Timing Capacitor need be installed for normal time periods of a few seconds to less than half an hour. If more time is needed, the second capacitor may be installed.
The Relay is an 833H series SPDT relay with Form 1C contacts rated for 7 Amps @ 250VAC. It has a 12VDC coil. The Relay contacts are available as .250" quick disconnect Faston connectors. The available contacts are the Common, NO (Normally Open) and NC (Normally Closed). This means that the circuit can either turn a device ON for a set time period or turn a device OFF for a set time period.
The PCB is double-sided, plated thru-holes, 1.50" long x 2.50" wide made of .062" FR-4 epoxy glass with 1-oz copper. It has green Solder Mask (LPI) on both sides with white Silk Screen on the Top side. It includes four mounting holes. The PCB traces for the Relay outputs are extra-wide on Top and Bottom sides for current-carrying capabilities.
This kit is built and fully tested. It is ready to work right out of the box. 12v Power Supply is not included.
We supply the parts, you supply the ingenuity. You will get the following:
Timer KitBuilt & Tested Timer with Relay Kit1 ea
SchematicsTimer with Relay Circuit1 ea
NightFire Electronic Kits
This is the place to get all of your SMT and Thru-Hole Electronic components!! You will find much more of the great kits with great low prices! Our categories now include:
Audio Amplifier Kits
DIP IC Kits
Op Amp Kits
Power Supply Kits
PCB Only Kits
LM380 Audio Power Amplifier Design Kit with Speaker & PCB
LM386 Low-Voltage Audio Amplifier Design Kit
Aluminum Electrolytic Capacitor (Radial Only) Kit #1
Aluminum Electrolytic Capacitor (Axial Only) Kit #1
Analog IC DIP-Only Design Kit #1
LM555 Timer DIP IC Design Kit with Proto-PCB
LM741 Op Amp DIP IC Design Kit with PCB
TL071 High-Speed JFET Op Amp SMT IC Design Kit
Adjustable Positive Power Supply Project Kit
LM317T 3-Terminal Var. Voltage Regulator Kit
Crystal Tester Project Kit with PCB
0603 SMT Resistor Kits
0805 SMT Resistor Kits
1206 SMT Resistor Kits
TO-92 Transistor Kits
SMT Transistor Kits
LM555 Develpoment PCBs
Power Supply Development PCBs
... and much more!!
We add new kits almost daily.
NightFire Electronic Kits