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[Krishna]

All respected Modellers.. Friends and Colleagues..   we all listens to music, in various ways.. for some, its may be just a used noise, while working, for some, is simple enjoyment, for some is crative.. and for some it will be the deepest inspiration with deep dreams and fantacies.. yes sure, to me, i am one of them who is inspired by each and every song, in various moods,and dreams a lots while hearing a music, and i flies to an other world with my dreams.. i clearly know, nothing can bring such a happiness, relief, recovery in the Mother Nature.. and to me, listening the music is not a process.. but it is a routine, with various modes of musics in hours.. so, again i clearly know there must be many like me, who all are submerged in the ocean of music..
       Listening the music to us was a great aspect around 90s and 2000 s.. after that we saw an immense growth in subwoofer systems.. all we then started to wander behind it.. interested people sported to buy various innovations in it.. while ignoring many facts about it.. even today many of my Friends are not aware about the phrasings of sub woofer systems.. a 5.1 and 5+1 are differ.. in 5.1, we will get one tweeter, one speeker, and half subwoofer for each side..so, X2 is 5.. simple conversion of ordinary stereo system.. but in 5+1, we will get one tweeter, one full range, half mid range and half subwoofer.. and in to two.. more exciting while properly placed.. but a true system is 7+1.. great.. but all these are coming with a single subwoofer.. and all we know, just like our eyes, ears also have a little timing to distinguish various audio freequencies from a single source.. brain must need some fractions of seconds to calculate the depth of the various frequencies, coming from various sound sources.. only then brain can asses the depth and variations from a spectrum of sound.. 

[Krishna]

actually, we lost this when we sat in front of the sub woofer with a great frequency boosting.. around 60 Hz, subwoofer thuds in a violent manner, and depresses our ear drum in a constant manner.. restricting the ear drum to follow other low, med and high notes, in time.. in reality, we lost the real value of the music, and merges in a BHOOM.. here came the importance of the Hi Fi system, considered as old.. old..??  never.. is experience.. by last some days, i realizes that i lost some of my old VHS and audio Cassetes of my ever favourite valuable collections.. so, i was in a great effort to recover all lost songs and videos and recovered about 99 %.. so happy.. then i realized the limitations, while listening the songa in subwoofer system.. even at low bass levels, and even with expensive systems.. feel bad.. so, i turned to my old Aiwa audio system, by brushing it all from dust.. its about 21 years old now.. after connecting system came in to life without any fail and the music was just like from heaven.. but the system is too big, and with high wattage.. and i want to listen music while in bed.. so, only way to think my own.. so i started searching all over my old traing notes, circuits, and applications.. with some hardwork, i synchronized a good system, for me as compact.. very compact.. with a feature of off set speaker system, one produces off set ambience when placed in a 90 degree corner..

[Krishna]

so, my idea was these..
must be very compact, will be with own speaker system, will be controlled with remote, and must be equipped with USB port, must be with mic function for karaoke, must be compatible with oscilloscope.. for audio editing.. and yes weightless and with wheels.. so, making a good enjoyable audio reproduction from a tiny space is only can by sound wave guids.. so, the primary design was on it.. and i realized it at first.. while combining three high power 3 inch full range speaker in a wave guide colum.. after some trial and error i reached in a amazing results.. so, i incorporated this in to a tiny envelop for adding the integrated amplifiers and others.. while keeping an aspect of easy servicing criteria.. so, i realized this with foam board and some plywoods.. and with keeping an aspect of audio editing, i finished this one in to a console, that can be easily moved to anywhere we like.. in studio, and all cables are hidden in main cable, for a tidy appearence.. so, this avatar born..and i realizing the real value of the music at present.. even with hours of music ears never fatigued.. heavenly music deep from soul..

[Krishna]

nothing is purchased for this machine but i searched all around me and found all needed material including components.. at beginning my idea was to add this unit with STK 465 or with STK 4191, as both ICs are my favourite ever.. but realizing the rate of its power i changed my mind with compact and less power ICs.. so, from my years of experience, i clearly know the TDA series is the best.. so to avoid dual supply, i choosed the TDA 2009 ST here and it wired for full fledge.. at 15.5 volts and 5 amps it is a roaring lion.. three ICs are same, as two drives the left and right while the thirdth one drives the ambience speaker.. live depth.. all the while.. main feature of this unit is individual graphic manual equalizers.. an unmatched quality in listening.. no electronic mess.. and also added pulse out for feeding a PA amp in need and digitalization.. can feed from any audio source with matching impedance.. a built in AGC also avoids sudden flutter in audio gain.. another feature incorporated is freequency shift.. for more ambience.. when it placed in a room about 1/3 of the length, it can reproduce heavenly music notes to our ear with great depth in need.. from this unit i feels that the voice of Lathaji, is flying towards me from heaven of music..

[Krishna]

also added the provision to connect external speakers capable of 12 watt RMS, when karaoke programes take place.. most of us buys cheap karaoke oriented systems by spending even 6 to 7 thousand rupees while ignoring the fact that nothing in it for 70000 Rs... here i used the real circuit based from my training notes with international standard circuit.. and components.. works like a dream.. with crystal clear voice reproduction.. all of the main console is foam board.. the base from scraped plywood.. and wheels from an old computer table.. it is easy to remove the cover and service.. all done in general purpose PCB.. all stickers are printed in A4 paper.. then cut & paste.. the big knob is for main volume while two tiny controls the depth..

[Krishna]

for additional depth of music, i added a TC reverse switch for the thirdth channel..
another nostalgic addition.. the analog VU meter.. driven by a filtered BC 148 B transistor network, i calibrated it with my digital calibrating systrem, that converted my PC in to oscilloscope.. it is nice to see while working..

[Krishna]

 kept the entire power supply unit as opened, and this also eliminates the noise disturbance with eddy currents.. cools well in high loads.. is 26-0-26 volt 5 Amps transformer about 25 years old.. and i dusted it out from my unused collections..
see the off set speaker layouts..

[Krishna]

the castor wheels for easy moving..
and this one will be my companion from now.. changing the music listening in to a heavenly experience..!!

[Krishna]

here is the sticker that i used.. worked with software and printed in A4 paper.. more easy to make.. so try always..