This simple circuit will energize a relay at regular intervals. The length of the intervals is adjustable from seconds to days - and beyond.
COMMENTS Homer SUGGESTIONS

Repeating Timer - Support Material

A SIMPLER REPEATING TIMER

Repeating Timer
Front Page
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International

Circuit Description

Click Here For A Photograph Of The Prototype.

Circuit Diagram For A
Repeating Interval Timer
Learn More About How A Cmos 4001 Monostable Works


Parts List

Parts List

Suppliers





Worldwide
RS Components





UK & Ireland
Maplin



Construction Guide

Click here if you're new to constructing stripboard projects.


The prototype of the timer was built using only the Stripboard Layout as a guide. So - if you reproduce the layout - you will have a working timer. Details of how to Test Your Finished Circuit Board are also provided.

The terminals are a good set of reference points. To fit them - you may need to enlarge the holes slightly. Then turn the board over and use a felt-tip pen to mark the 42 places where the tracks are to be cut. Before you cut the tracks - use the "actual size" drawing to Check That The Pattern is Correctly Marked .


Repeating Timer - Pattern 
For Cutting The Tracks


Actual Size


Stripboard 
    - Actual Size -


When you're satisfied that the pattern is right - cut the tracks. If you don't have the proper track-cutting tool - a 6 to 8mm drill-bit will do. Just use the drill-bit as a hand tool - there's no need for a drilling machine. Make sure that the copper strip is cut all the way through. Sometimes a small strand of copper remains at the side of the cut and this will cause malfunction. Use a magnifying glass - and backlight the board. It only takes the smallest strand of copper to cause a problem.

Next make and fit the Ten Wire Links. I used bare copper wire on the component side of the board. Telephone cable is suitable - the single stranded variety used indoors to wire telephone sockets. Stretching the core slightly will straighten it - and also allow the insulation to slip off.


Recurring Timer - Make A


Then fit the 7 resistors - the 2 presets - the 5 capacitors - the 2 LEDs - the transistor - and the diode. The resistors are all shown lying flat on the board - but those connected between close or adjacent tracks are actually mounted standing upright. The same is true for the diode.


Repeat Timer - Make B


Fit the relay and the two IC sockets. Then examine the underside of the board carefully - to make sure that there are no unwanted solder bridges or other connections between the tracks. If you backlight the board during the examination - it makes potential problem areas easier to spot. When you're satisfied that everything is in order - add the 13 solder bridges to the underside of the board.

Finally - insert the 4060 and 4001 into the sockets. In each case, make sure that pin 1 is in the top left-hand corner - and check carefully that all of the pins are correctly inserted into the socket. Sometimes - instead of entering the socket - a pin will curl up underneath the IC.

You Are Now Ready To Test Your Finished Circuit Board.


General Information


General Information


Click Here For A Photograph Of The Prototype.

Repeating Timer
Front Page
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International