m u s ic a l c a llin g b e ll b y kaly an p r odhan w w w .kaly an-pr odhan.t k c on n e c t i on d i agram c om pon e n t li st w i t h c ost ( a pproxi m at e ) c om pon e n t d e sc ri pt i on ( ic an d tran si st or) pre c au t i on modi f i c at i on f or adapt at i on d es cri pt i on: d es cri pt i on: t hi s i s t he s i m pl e s t e ve r m us i c a l c a l l i ng be l l t ha t c a n be e a s i l y bui l t . it us e s t he m us i c a l 3 pi n ic u m 66 a nd a popul a rl y know n t ra ns i s t or bc548b. t he c i rc ui t c a n be m a de e ve n w i t hout s ol de ri ng a nd t he i de a l for t he fi rs t e l e c t roni c proj e c t for ne w bi e s . h e re t he m us i c a l ic u m 66 ge ne ra t e s t he m us i c w he n i t re c e i ve s s uppl y a nd dri ve s a s m a l l s pe a ke r t hrough a c l a s s c a m pl i fi e r us i ng s i l i c on t ra ns i s t or bc548b. f i g-1 : c on n e c ti on d i agr am t he c onne c t i on di a gra m i s s how n be l ow . t he c om pone nt de t a i l s w i t h c os t i s a l s o w i t h t hi s . t he ba t t e ry s uppl y s houl d be ke pt i n a ba t t e ry c ont a i ne r t o e ns ure t he c onne c t i on. t he vol um e of t he s ound of t hi s c i rc ui t i s s o m uc h t ha t i t c a n be us e d a s a c a l l i ng be l l . if a nyone w a nt t o re duc e t he vol um e of t he c i rc ui t t he n i ns e rt a re s i s t a nc e () i n pl a c e of t he bl ue l i ne c onne c t i on. in t hi s c i rc ui t pl e a s e don' t gi ve t he s uppl y be yond 3 vol t w i t hout m odi fi c a t i on a s t he ic m a y got da m a ge d. it i s be t t e r t ha t you s houl d not run t hi s c i rc ui t i n e l i m i na t or a s m os t of t he a va i l a bl e e l i m i na t or don' t ha ve a good fi l t e r bui l t i n a nd ha ve no pre c i s i on ove r vol t a ge prot e c t i on. t he c i rc ui t s houl d not be run i n re c ha rge a bl e ba t t e ry a l s o i f t he s pe a ke r re s i s t a nc e i s l e s s t ha n 8 o hm a nd m a y burn t he t ra ns i s t or. u m 66
c om ponent c om ponent s l n o i t e m s pe c i fi c at i on cos t 1 ic u m 66 t hre e pi n ic, l i ke pl a s t i c c a s e t ra ns i s t or. p a c ka ge c ode t o -222. rs . 6 t o rs . 20 de pe ndi ng upon t he m us i c a nd pa rt c ode . 2 t ra ns i s t or bc548b -s a m e - rs . 1/ - t o rs 2.5/ - de pe ndi ng upon t he m a ke . 3 s pe a ke r 2 -4 s pe a ke r ha vi ng di a m e t e r 2 i nc h t o 6 i nc h w i t h 50gm t o 200 gm m a gna t e a nd t he re s i s t a nc e i s m ore t ha n 4 o hm . rs . 10/ = t o rs 35/ -. 4 w i re for c onne c t i on a ny i ns ul a t e d w i re . f i ve c ol oure d w i re c a n be us e d. e a c h 1 m = rs 2/ - t o rs 3.5/ - 5 p us h but t e n s w i t c h a ny t ype . rs 1/ - t o rs 25/ - 6 ba t t e ry a ny d ry c e l l ba t t e ry, a l ka ; i ne ba t t e ry. re c ha rge a bl e c a n be c onne c t e d w i t h prot e c t i on/ m odi fi c a t i on. rs . 4.5/ - t o rs . 25 e a c h. 7 ba t t e ry h ol de r a ny t ype but s houl d be m a t c he d w i t h t he ba t t e ry. rs . 7/ - t o rs . 10/ - 8 re s i s t a nc e o pt i ona l q ua rt e r w a t i f not s pe c i fi e d. rs . 4.5/ - t o 2.5/ - for 1 doz z e ne ,
c om ponent d es cri pt i on c om ponent d es cri pt i on f i g -2 : p i n confi ge ra t i on c o m p o n e n t c o m p o n e n t p i n 1 p i n 1 p i n 2 p i n 2 p i n 3 p i n 3 icu m 66 o ut put + v c c -v c c bc548b e m i t t e r ba s e col l e c t or p recaut i on p recaut i on p oi nt s of i m port a nc e : n e ve r c onne c t t he ic i n re ve rs e s uppl y c onne c t i on. t he m us i c de pe nds on t he pa rt num be r of t he ic . t he t ra ns i s t or a re s houl d be c onne c t e d i n prope r pi n c onfi gura t i on. t he re c om m e nde d pow e r s uppl y i s ba t t e ry of 3 vol t . t he s pe a ke r a nd re s i s t a nc e ha s no t e rm i na l pol a ri t y a nd c onne c t i on poi nt s c a n be i nt e rc ha nge d. 1 3 2
modi f i cat i ons modi f i cat i ons 1. f or s u p p l y vol tage d i ffe r e n c e . t he ic pos i t i ve poi nt s houl d be bi a s e d w i t h pot e nt i a l di vi de r s uc h t ha t t he vol t a ge a t t he pos i t i ve i n s houl d not e xc e e d 2.5 vol t . f or e xa m pl e i t s houl d be 68k a nd 10k a nd t he t e rm i na l vol t a ge w i l l be 1.82 vol t . s om e t i m e s t he ic i s s uppl i e d onl y t hrough a ve ry hi gh va l ue s e ri e s re s i s t a nc e l i ke 220k from 12 vol t , but t he out put bi a s c urre nt of t he ic w i l l not be s uffi c i e nt t he n t o dri ve a nd w orks a s a s i gna l a nd c a n onl y be dri ve n t hrough pre a m pl i fi e r or us i ng d a rl i ngt on pa i r/ z hi kl i pa i r a s buffe r. 2. to l i mi t s p e ak e r c u r r e n t/ r e d u c e vol u me . t he s pe a ke r c urre nt c a n be l i m i t e d us i ng s e ri e s re s i s t a nc e i n bl ue l i ne s uc h t ha t t he ba s e c urre nt a s w e l l a s c ol l e c t or c urre nt (i . e . s pe a ke r c urre nt a l s o). t he form ul a i s r= { (v c c -v e e )-.05} *[ra t i o of pot e nt i a l di vi de r i f us e d]*b/ is pk. is pk= s pe a ke r curre nt , b= h f e of t he t ra ns i s t or 3.to i n c r e as e vol u me / p r ote c ti on of tr an s i s tor . t he c urre nt c a rryi ng c a pa c i t y c a n be i nc re a s e d us i ng d a rl i ngt on pa i r w i t h pow e r t ra ns i s t or t o i nc re a s e vol um e .
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