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Show (Edited by G. Douglas VrUrop. Editor of Kadio Merchandismg.' HOOK-UP FOR THE REFLEX CIRCUIT "i5r " I feO-yO VOLTS I The hook-up shown is for a reflex circuit employing two tubes. A vacuum tube is used as the detector In place of a crystal as Is the case in many reflex circuits. A "soft" tube operates best as the detector. The tuning Is done by a varlo-coupler, honeycomb or spiderweb coils and by the secondary condenser con-denser with vernier attachment. The by-pass condensers across the phonea and audio frequency transformer windings are extremely Important The potentiometer across the "A" battery should be about 400 ohms reslstanca The second tube should be an amplifier. All wires should be as short aa possible and none parallel or close together. The mica fixed condenser across the phones Is .002 mfd. |