Adjustable pulse delay circuit / phase adjustment

[riccardo]

Hi,

Does anyone know of a simple way to add a small time delay to a digital pulse? I want to be able to control the phase of the output signal relative to the input.

Thanks!

 

[blueroomelectronics]

How small a delay? What's it for?

 

[riccardo]

Delay of around 1us to 1000us, adjustable.
It is to two have two PWM circuits operating at the same frequency/duty, but with an adjustable phase difference.

 

[blueroomelectronics]

Post your schematic. Are the PWMs from a microcontroller?

 

[riccardo]

I'm planning to use these **broken link removed**

Using 2 of them, I can link them to both pulse at the same time. One operates and a master and the other one just copies that. There is a 12V signal that links the two circuits. I want to be able to add a delay to this signal, so that the slave unit pulses are slightly delayed.

 

[ronv]

What is the frequency and duty cycle of the 12v signal?

 

[riccardo]

It is adjustable over a wide range. I was thinking of something like this circuit, but I am not sure that that one will delay the pulse without changing the pulse width.

 

[ronv]

Delay

How about something like this? R1 & R2 have to be a dual ganged pot. Maybe a schmitt trigger for the inverters. (CD40106)

 

[riccardo]

THat looks perfect, thanks!