The ProtoAndroid is a pneumatically actuated robot. Twin 12V compressors charge a six gallon reservoir. The naked compressors made a big racket so they were acoustically encapsulated and now merely purr.
a) Compressor Acoustic Encapsulation with Baffled Cooling Fan
b) Twin Air Compressors (pulled out a bit for visibility)
c) Six Gallon Air Reservoir
d) Battery Charger and Electric Power Circuitry
e) 12 Volt 13 Amphour Lead Acid Gell Cell Pack
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This page grudgingly ;^) underwritten by Faustex Systems Corporation