I found this old circuit diagram for the Dod Fx-90 analog
delay of the 1980s in my file.

It uses the Matsushita MN 3005 bucket brigade device IC.

Early models of the Boss DM-2 also had the MN 3005.

You can ask any friend who knows electronics to build
one for you on Veroboard,



This post has been edited by Tham: Sep 28 2019, 06:00 PM

The MN3005 is a very expensive chip.

You would be better off ordering an analog delay from Ali Express.


https://www.aliexpress.com/item/4000091307343.html


https://www.aliexpress.com/item/32852767267.html


https://www.aliexpress.com/item/32973167922.html



This has digital, analog and tape delays.

https://www.aliexpress.com/item/33042143443.html



They also have kits.

https://www.aliexpress.com/item/32589004909.html