herb: BDX cell repair

I have bought a JUNIOR BDX piezo microphone,but it was out of order.I decided to repair it.Fortunately the BDX cell is well designed,by unscrewing the cover access to the membrane is possible.I unstick the membrane with a cutter blade and remove it.Then I remove the defect crystal.I put a new piezo disc on two pieces of glued foam ,I put a vertical piece of wire on the center of the disc.

I put the membrane and glue it on the cell and on the vertical wire.

I have just to cut the wire and the repair was done

Now the microphone work again with a very good output,it is audible on a Aux input of an amplifier

Piezo dics are available for 1 or 2 euros in electronic stores.Complete spare piezo cells are not available.

Olivier

Attachments:

• Setting of piezo disc (128 KB)
• Setting of the membrane (116 KB)
• Repaired cell (99 KB)

To thank the Author because you find the post helpful or well done.