DTC is a 'quick and dirty' hack to quickly assemble your Devanagari Unicode (pdf-file) characters. The raw unicode output can be copied to any compatible application. Click on the characters as you want them to appear. Their Unicode entities and the output appear in the indicated areas.

Replace क by your character.
Unicode entities

You can also edit the code in the above box directly and see the results below
Devanagari output
 
Known Issues
The vowel sign corresponding to इ has to be clicked before the character in Firefox. For others, it has to be clicked after the character.
Designed for Firefox, tested on IE6, NN, Mozilla and Opera