Electrodynamic Loudspeaker Test Jig

A simple circuit (in addition to DC resistance checks of the Field Coil/Output Transformer/Voice Coil) to test an Electrodynamic Loudspeaker at a Flea Market, Hamfest or other... as requested by one of my viewers/subscribers.

The schematic:
https://drive.google.com/drive/u/0/folders/1YWFz8oWHopVcscbIxR7JOYqRYrRYTjOE

Notes:
- two 9V batteries in series can be used to power the circuit in lieu of the Ryobi...
- I used a 3.5mm Headphone Amplifier Two-Stage Gain Switch (Gain set to HIGH), Portable HiFi Headset Amplifier Compatible Phone,Tablet, MP3/4 and Computers:
https://www.amazon.com/dp/B09BJB6TQ3/ref=cm_sw_em_r_mt_dp_ZDJE5VRKW3YN8290QQ6R?_encoding=UTF8&psc=1

Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.

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