I have misplaced my 1st gen Apple Pencil Charging Adapter please let me know how to obtain another

You can charge your Apple Pencil directly [and very rapidly] from your iPad.

The inline charging adapter is not sold by Apple as a replacement item - however, if you contact Apple Support and ask very nicely, they may be able to help. Similarly, should you visit the Genius Bar at your local Apple Store, along with a healthy approach to requesting help, they too might be able to assist.

Alternatively, it is often reported here that is possible to purchase a third-party replica from a popular online retailer or auction site. Being totally passive, the non-OEM part carries little risk of damage or other issues.

Apple Support can be contacted using the Contact Support link at top-right of this page.

I hope this information proves to be helpful to you.