Hartley Oscillator Trainer is an SSI India product in the AMPLIFIER AND OSCILLATORS category. Key specifications include SKU: PAO-E018. TECHNICAL SPECIFICATIONS Power Supplies. DC Power Supply IC Regulated +15V DC, 150mA. Operated on Mains power 230V, 50Hz +10% Components are mounted on the panels are. HARTLEY: 1MHZ,304 KHZ SALIENT FEATURES.