Jump to content
Electronics-Lab.com Community

3 Minute Timer


Recommended Posts

Thank you for that warm welcome Ante. As a Gas Engineer I have to carry out Gas Pressure tests on a premise. The first part is to connect a U Gauge of water to the pipe work to be tested. I time this for one minute, if the water hasn’t gone up it means that the main inlet valve is not letting bye. Next I increase the pressure to a higher level and allow a further one minute for the temperature of the incoming gas levels off. I now read the level of the water in the U Gauge and wait for a further two minutes, if the level hasn’t dropped the pipe work is sound.
What I need is a timer, or probably two timer’s one for one minute and one for two minutes. At present we use a standard stop watch but this is another piece of kit to carry, as we usually work in dark places a timer with a green and red LED (start and stop) and a Beep would be so much better. It has to be compact to fit into the U Gauge and have an on/off switch. Unfortunately I am not very good at explaining things; I hope this gives you some idea. Any suggestions or ideas will be gratefully received.

Kind Regards


Link to comment
Share on other sites

Hello jimcorrigans

Ante is right about using the CD4060 for a timmer chip, thats if you have at lest about a 12 Volt power supply handy. But it could been done with with a coupple of transistors and some caps, plus some resistors. Sounds like a new Project Thread to Me. I think this timmer could be run off of 1.5 volts or so.  Cool something to think about.  SMD's come to mind?
                                          Have fun

Link to comment
Share on other sites

To power the timer a small PP-3 and a low drop regulator like L4940 or similar would be fine, this will keep the timer run exactly right each time.
Here are a few examples on CD4060 circuits, of which some are very well explained:

Link to comment
Share on other sites

I am going through those web sites you suggested and love every minute. They are brilliant, I wish I understood them a bit more, but with more years behind me than I have in front of me I do worry if I have time to learn all the things necessary to produce a finished item, so here I am, cap in hand, are there any kits around that can cut the learning curve?
With fingers crossed



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...