Built & Tested - Timer Relay Kit #1960 For Sale
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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:
TypePart DescriptionQuantity Timer KitBuilt & Tested Timer with Relay Kit1 ea SchematicsTimer with Relay Circuit1 ea
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