Yes , since you're using a 9V Adapter9 V adapter to power up the circuit, iI would say it's good to have a Capacitor 'causecapacitor because you won't risk fluctuations in the output voltage. It's better to have it to make it work under optimal conditions.
Copy edited (e.g. ref. <http://english.stackexchange.com/questions/4645/is-it-ever-correct-to-have-a-space-before-a-question-or-exclamation-mark#comment206109_4645>). In English, the subjective form of the singular first-person pronoun, "I", is capitalized.
Peter Mortensen
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