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..

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..

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..

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..

 

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..

Satz..this is not a show off.. but we all know that we have lots of  music lovers among us and yes singers.. my this humble work may inspire us all.. and see waht we can do with handy things.. !! be inspired.. because we are RC INDIANS...

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..

i 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..

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

 

so make it.. listen it.. realize our life.. if anyone intersted will share the build logs, and circuits.. 

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

Great Roopakrishna,

i remember  using STK 459 building my own amplifiers, just superb. i misght have realized & made about 15 odd ones, all using different biasing & mostly using ICs & few powerful ones using transistors (2N 3055).

this reminds me that its been 16~17 years for me & they still rock...

Thanks for this update.

Cheers!

Sandeeji.. great to hear.. and at present we acts and connives to the available stuffs because of our helplesness.. it is unmatched that the quality of old integrated amplifiers.. and the words regarding to the 2N 3055 is goosefleshing.. immense power.. and so happy to hear some crative and very positive words from you.. "this reminds me that its been 16~17 years for me & they still rock... "  is sure.. all circuits are engineered for perfection.. now we missing it.. a lots.. but me, not now..
going back.. with old is gold..  thanks once again for the great inspiration..

I am also a music lover. i listen the songs in my bed in peace and goes far beyond in the world of dreams.
As roopeshji said , todays songs ( not all ) irritate the ears a lot. with their peculiar sound and high bass. Old songs use to  maintain the balance of each instruments sound.
Toady speakers in market are on basis of watts output and not on frequency.
BOSE still gives more emphasis on frequency. Bose speakers are one of the best .

roopesh,

you are always from one of the great  inspirational people from the forum ,
who always starts something different , interesting and helpful and complete it in very neat  manner,   glad we are together.

south india has very good talent..

I second that.
Great inspiration and talent.

Swiz.. its true.. and Vineet, all we are INDIANS.. not south and north.. at border, may be in bone freezing cold, or may be in skin burning heat, our brave soldiers keeps our peace of Nation, with watchful eyes, with only one mind.. thers no south,north,caste,or religion.. !! we all try always and shares our ideas.. some are amazing when compared.. music and art is surely the gift to us from Almighty.. and i am only one among us.. and i am trying to inspire you all, as all you inspires me with your ideas.. once again.. million thanks for the inspirations.. have nice musics..

Quote from: roopeshkrishna on May 28, 2012, 10:35:55 PM
so make it.. listen it.. realize our life.. if anyone intersted will share the build logs, and circuits.. 

That would be lovely! Please include pictures of the insides of the main unit. It would give everyone an idea of how it could be put together. How did you design the PCBs for the controls etc. And what dac have you used for the digitlal input?

Awaiting this information with eagerness.

+1

Roopesh!
look into your first couple of posts, something is not connecting, with my limited electronic acumen i can tell you for sure, you need to revisit your first couple of threads and correct these errors. Super colour combo, very catchy, quite like your boats

Sir, at first i was trying to tell about the heavy bass notes that emerges from sub woofer.. according to my training notes, if we examine, a Hi Fi (High Fidelity) audio system, we can simply found at least two frequency controls, as bass and Trebble... and main feature of these controls are, at middle position, it will show us as "0", and towards left, its - side and towards right, its + side.. and if we kept all three, means Bass, Trebble, and Prescence ( in costly sets), at "0", and if connected to the needed speaker system, of manufacturer, and played a song, in a volume level, that, required in the service manual, with VU level,    as peak, imagine we are going to listen a Tabla notes, at this level of controls and volume level, described by manufacturer, in service manual, the notes coming out of the speaker must be in a manner of a real Tabla play, at in front of us.. means, it must like as real as a real Tabla playing in front of us.. it deaviates according to room set ups, and arrangements of speakers.. but still it will be 80 % true.. and i checked with Tabla, many times, and amazed.. because, i always think about the dedication of the team of engineers who painstakingly developed old systems.. such machines are not designed to make a big noise, but to reproduce the music lively in front of us..  i have a good collections of such machines, in my scrap room, as Sony FH 7, FH 22, Beast, Panasonic, O55 B, Hitachi HT 61 T, and more.. such machines are too good in audio reproduction.. but heavy and cumbersome..  this is my considerations.. may vary to seniors.. and no argue.. but still i love to hear live music through the real full range speaker system, with a little depth, as i described.. nothing can bring such a sheer happines in life.. 

Sushil Sir, will add all circuits here.. its nothing extra ordinary.. as i mentioned, at first i was waiting to use STK ICs.. but soon realized its power ratio.. so, i turned to my spare collection, and found lots of TDA 2005, 2007 and 2009.. as i know 2009 is most versatile, and simple, i choose it.. and tested with LA 4440, and LA 4445, along with UPC 1230, but not satisfied.. so i again turned to TDA 2009.. its a perfect IC for a great sound reproduction in great quality at low amplitude..  and i made the main PCB for power amp, with my great friend, who is a PCB designer, Mr Rafeeq, helped me a lots.. and the equalizers are purchased from market many years before.. its based on LM series ICs.. the mic driver is based on again LM ICs.. the accoustic wave guide is adopted from old speaker systems as folded horn designs.. with guides.. all guides from foam boards.. to avoid vibratios i used SR glue to seal it all.. the vent is opened at bottom of the case, near to the base.. this also gives me a reflected waves at 90 degree shift when i am in bed.. the VU meter is based on transistorised circuits.. the pulse out is from a RCI based compromising circuit.. published in EFY.. once.. the Digital input is based on card reader.. it is liberally available in market with remote controller.. and a multi flat cable is used for Analog inputs.. the D to A converter is based on a circuit i noted from a professional amp.. but eliminated, because i do not need it.. will add all used circuit here one by one.. still the unit is working now.. cool.. and inspires me a lots.. all forgotten music is alive back.. and i feels the life is too sweet even when i am alone.. with walls all around me.. the music takes us in to love.. excitement.. nostalgia.. child hood.. hope.. and inspiration to live.. its amazing..

we starts from power supply circuit.. today we have ample of powersupply uints as SMPS.. one can simply purchase a computer powersupply, and can short the coloured leads as black and grey, or in some as green and grey.. check it..   but here in my experience, nothing can match a regulated powersupply, made off a good transformer.. we need a good transformer, well wound, well insulated, and specially designed for audio applications with heavy core set up.. here i used a 26-0-26 volts 5 Amps transformer.. as i got it from my old collection.. and amazes the old thing is still young in working.. !!  to rectify i used high Amps diodes.. so, after rectification, added a 4700 UF 65 volts heavy duty capacitor, and final voltage came as 28 at load of 1 amps as bleed.. each diode was backed up with 104 High voltage disc capacitors , and 122 high voltage capacitors, to eliminate ripples.. after that i connected to a second bank of capacitor, again 4700 UF 65 volts capacitor.. this voltage is feeded to a power transistorised circuit, as darlington pair, with TIP 3055, with SL 100, and the base voltage was controlled by a 7815 regulator, whose center lead is controlled by a 1.7 volt L E D.. this giave me a 15.5 volts even at load.. as i need only a 13 .2 volt for a good operation, the above voltage gave me a stunning working all the while.. a 1000 Ohms bleeder resistor used as a surge protector.. the final voltage is splitted as two.. one 12 volts from main amp board, for euqlizer, other circuits.. the power circuit follows that i used..

Most of 0.5k priced SMPSs are underrated. 400w SMPS shows 12 Volt 14A.
But the diodes internallu found for 3A with HeatSink.
HF Transformers coil windings are found not suitable for even 10A.
-------(Skin effect is also dominant in HF Transformers, so effective crossection becomes 0.5 in 10-1000KHz.)

So, Power transformers and Power diodes are much more well suited rather than Computer SMPS.

But Custom SMPS with E50 or similar core (1KW or more) is much cost effective and lighter.
They are used in High power branded systems. One can search the circuits easily by "1KW SMPS"
Here
And can design converters here.