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The Pearl is an outstanding example of extraordinary support of the DIY community through Pass labs - in this case of Wayne Colburn who designed the Pearl. Since nearly all needed information is contained in [Wayne Colburn's instructions], you'll find here bits and pieces of informations and discussions that didn't find their way into the excellent pdf just mentioned. == the purpose of the mysterious battery mentioned on the pcb == As [Wayne himself says], it can replace the D1 Zener diode to form a better 9V reference for the regulator differential amplifier. How long it lasts, is discussed [in this post], it seems only 9mA are drawn and if R5 is removed, the battery has to provide only the leakage current of the cap. |