A volume control in a box made as interesting as possible.
jacks. Or almost anything else really.
A battery powered stereo/dual mono headphone amplifier.
Powered
by one PP3 size 9 volt battery, the BPL2S has two balanced audio inputs
which may be switched to one or both ears.
A battery test button will illuminate the power LED if there is more than
one hour's life left in the alkaline battery.
The headphone socket is suitable for use with both
'A' gauge
(stereo) or 'B' gauge (PO) jacks.
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