OCR Text |
Show ill jfjr " Slasrlo eeeae aaapllrytaug emit. vacuum tubea and sockets, the coat of th. additional parts for th. a.t .hould net .xceed 22. Another step In amplication may be added In Just the aame manner, maa-lrg maa-lrg the connection along the dotted line from the Jack (No. I). I.eeee Cowple, A form of coupler, the aecondary of which la brought Into resonance with the primary by eliding beck and forth within the primary coil. The wlndlnge of the primary and aev-ondary aev-ondary cotla ahould be In the same d' rectlon. The cloeer the coupling the better are the slsnala received. nr R. i ni wca. Direct er Radio net Mote ( AaeerSra. A number of amateur are using receiving re-ceiving sat. with a alngl. vacuum tube uetector. With little eapenaa they rould add an ampl'fler to thl. r.c.lv.r and greatly Increaee their reception. . The diagram .how. .a amplifying knit ahlch can be constructed for such s est. No. 1 represents two wire, leading Irom the telephone binding poate of the df-trrtor set to the Input binding post, of the amplifier. TKl.t'PHONE JACK. No. t le a telephone Jack, similar to th. oa used on a line telephone switch, board It may be purchased at a rea. eonnble price In any supply .tor. Th. plug for th. Jack la attached to the telephone corda. When one want, trt listen la on the detector only, he plug, in ind cuts out the amollfylns circuit automatically. No. I la an audio frequency transformer. trans-former. "A" represent a Ita primary and "B" Ita aecomlary No 4 An amplifying vacuum or "hard tur-e. No, ft Filament rheostat. So. A ft-volt storage tsattery. So. 7 HI a -volt atoraae battery. No. II Another telephone Jack. Th aix-volt A" battery used for th detector tube may be used also for tiie amplifier. fr-LCW WIRKI. Thla aet may be mounted In a cabinet about all or aeven Inchea long and th aame height aa the detector receiver. Hemembrr to have aa few wire aa poa- Ible. The vacuum tube socket la th earn In the amplifier aa la the detector. detec-tor. Including an extra R" battery necea-aary necea-aary and the Jarka.,plusa. ranform- |