Printable Vactrol optocoupler, LED and LDR in a box

Printable Vactrol optocoupler, LED and LDR in a box

Description

A Printable Vactrol, Consisting Of A Led And A Ldr In A Small Light Tight Box. Print In Black. Can Be Closed By Melting Along The Seam With A Soldering Iron. Used For Autotuning An Audio Notch Filter. Second Photo Shows The Evolution Of This Project.

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Electronics