▁ ▁In ▁a ▁cond enser ▁micro phone , ▁the ▁dia ph rag m ▁is ▁placed ▁in ▁front ▁of ▁a ▁plate ▁and ▁is ▁charged . ▁In ▁a ▁dynamic ▁micro phone , ▁the ▁dia ph rag m ▁is ▁gl ued ▁to ▁a ▁magnetic ▁co il , ▁similar ▁to ▁the ▁one ▁in ▁a ▁dynamic ▁loud spe aker . ▁( In ▁fact , ▁a ▁dynamic ▁speaker ▁can ▁be ▁used ▁as ▁a ▁rud iment ary ▁micro phone , ▁and ▁vice ▁vers a .) ▁ ▁The ▁dia ph rag m ▁in ▁a ▁micro phone ▁works ▁similarly ▁to ▁the ▁human ▁e ard rum . ▁ ▁Other ▁uses ▁In ▁a ▁ph on ograph ▁reprodu cer , ▁the ▁dia ph rag m ▁is ▁a ▁flat ▁disk ▁of ▁typically ▁m ica ▁or ▁is ing lass ▁that ▁converts ▁the ▁mechanical ▁v ibration ▁im part ed ▁on ▁the ▁but tr ess ▁from ▁the ▁recorded ▁gro ove ▁into ▁sound . ▁ ▁In ▁the ▁case ▁of ▁ac oust ic ▁recording ▁the ▁reprodu cer ▁converts ▁the ▁sound ▁into ▁the ▁motion ▁of ▁the ▁need le ▁that ▁scri bes ▁the ▁gro ove ▁on ▁the ▁recording ▁media . ▁ ▁See ▁also ▁Ac oust ic ▁memb rane ▁ ▁References ▁ ▁Category : Ac oust ics ▁Category : L oud spe akers <0x0A> </s> ▁Pe u ced an um ▁pal ust re ▁( mil k - par s ley ) ▁is ▁an ▁almost ▁gl ab r ous ▁bien n ial ▁plant ▁in ▁the ▁family ▁Ap ia ceae . ▁It ▁is ▁so ▁called ▁in ▁English ▁because ▁of ▁the ▁thin , ▁fo et id ,