Thursday, March 27, 2025

Schematic of Pleiades K117 1.3V 2SK117 JFET microphone booster pre preamplifier

 At you risk.

A protective fuse must be connected in series with battery for safety.

A very high quality Bulgin AA battery holder is used in the prototype  which has almost 0 ohms contact resistance, very useful for noise performance.

The 1st stage of any system is the most important as any artifact, noise,... will be multiplied thousand of times by subsequent stages.

For circuit description please see a previous post.

 



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