In-line headphone amplifier


Step 23: Battery spring

Picture of Battery spring
The spring contact for the battery negative is next soldered in. The picture shows the earphones I am using to test this with.
Remove these adsRemove these ads by Signing Up

Get More Out of Instructables

Already have an Account?


PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!