help wanted with cd4015 shift register

Hi from England and a new member

I have a running light display using a CD4015 shift register and I want to use it so that it comes on with the power and does not need the push to make start button


I had thought of replacing the PTM button with a capacitor and resistor but, before I blow the assembly do you know any way I can by pass the PTM ( I assume it is a trigger ) so it comes on when you switch the power on.

To further clarify I want a electronic/ electrical alternative to a PTM button

Some of my stuff is on You Tube under Sparkfishes

Sparkfishes said:

Hi from England and a new member

I have a running light display using a CD4015 shift register and I want to use it so that it comes on with the power and does not need the push to make start button


I had thought of replacing the PTM button with a capacitor and resistor but, before I blow the assembly do you know any way I can by pass the PTM ( I assume it is a trigger ) so it comes on when you switch the power on.

To further clarify I want a electronic/ electrical alternative to a PTM button

Some of my stuff is on You Tube under Sparkfishes

Click to expand...

hi,
A simple circuit diagram would be helpful, we have no idea in what way you are controlling the clock/shifting to the 4015.?

I have worked a solution out for myself now thanks anyway
just incase any one wants to do the same
i.e. eliminate the manual PTM on button with an electronic self start impulse
Here is what I did**broken link removed**
**broken link removed**
I hope the images work I don't really know how to insert them here

Sparkfishes said:

I have worked a solution out for myself now thanks anyway
just incase any one wants to do the same
i.e. eliminate the manual PTM on button with an electronic self start impulse
Here is what I did**broken link removed**
**broken link removed**
I hope the images work I don't really know how to insert them here

Click to expand...

hi,
For inserting images:

Click 'Manage Attachments' button [ lower down the replying page]

This will Open a Window, use the 'Browse' button to locate the image on your PC.

Then click the 'Upload button

Wait till the upload is done and click the 'close this window'

While the Browse window is open, it lists the type of files and their max sizes that can be uploaded.

Give it a go now.

By passing or substituting the Push to make trigger on CD4015

Thanks for the replies
I finally worked out how to eliminate the push to make "trigger" on a running light display which used the CD4015 dual register shifter
So if any one else wishes to use the Vellman LED running Lights display so it runs as soon as you put the power on this is how it is done
I am sure it would be helpful in other , similar application where a trigger pulse is needed but you do not want to press the button yourself - say in a remote situation as mine was.
In my application the running lights will show power is ready to be applied to my HVtransforer - and the TESLA COIL

Hi Sparkfishes,
Your diagram is very useful to me -It is exactly what I need.

One question - I do not need a power indicator LED and also I will be using 9V, so do you think I could just remove the 100ohm resistor and LED, or would I need to use a resistor of a different value ?

Many Thanks in Advance
Steve

stevet284 said:

Hi Sparkfishes,
Your diagram is very useful to me -It is exactly what I need.

One question - I do not need a power indicator LED and also I will be using 9V, so do you think I could just remove the 100ohm resistor and LED, or would I need to use a resistor of a different value ?

Many Thanks in Advance
Steve

Click to expand...

hi Sparkes hasnt posted for almost a year.

I think he made an error in drawing his 'modification' the ends of the 100R and 100uF are reversed, so the LED and 100uF are reversed polarity.!

I would recommend that you do not use his mod.