Friday, October 5, 2012

LM3875

Baru aja dateng...


UPDATE 22 Nov 2012

Skema sama seperti datasheet, cuma saya tidak memakai kapasitor feedback, DC offset dibawah 50mv.
Komponen yang saya pake memanfaatkan komponen yang ada :
Resistor shunt pake Dale 22k 1/4 watt
Resistor penentu gain memakai Amtrans amrg 20k dan 910R.
Dioda pake jenis fast recovery ( merk gak tau)
Elko supply semuanya memakai Elna Silmic II gold 1000uF/50V
Kapasitor bypass supplypake wima mkp (dibawah PCB)
Kapasitor coupling pake M-cap
Trafo tadinya pake copotan Onkyo, tapi ternyata keluaran sekunder paling besar cuma 17 volt,diseri dengan trafo lokal (diambil 110v) biar bisa dicolok 220v, soalnya primer trafo ini 110v.Tapi karena trafo ini mau dipake di proyek lainm, maka terpaksa diganti dengan trafo abal-abal 5A (tulisannya).













Trafo abal-abal, dipake 30 menit udah keringetan....

Perbandingan dengan LM3886 dan LM1875 :
Kalo bicara banding-membanding, komponen yang dipake harusnya sama.. ;)
Jadi perbandingan kali ini lebih tepatnya perbandingan project, bukan perbandingan type chipamp yah :)
Proyek Gainclone LM3875 ini tidak lebih baik, dan juga tidak lebih buruk dari proyek Gaionclone LM1875 dan Gainclone LM3886. Bagi saya, ketiganya berbeda karakter.
LM1875-->saya pake buat musik melow (jazz, instrument) karena karakternya yang paling melow dibanding kakak-kakaknya.
LM3886-->saya pake buat musik cepet (hiphop,metal,rock) karena karakternya paling garang 
LM3875-->saya pake buat musik pop, oldies dan dangdut :) karena karakternya agak mewakili diantara keduanya dan memiliki dinamika yang paling bagus.
Ribet amat yah?? beda musik, beda ampli !!! terus kalo ampli yang all around ampli apa? 
Mungkin saya aja yang gak bisa ngeraciknya , makanya gak punya ampli yang bisa cocok dengan segala musik.

Tuesday, October 2, 2012

Tips To Find the Best Airfare to Africa

Africa has grown to be a very popular tourist destination for international vacationers as well as business travelers. Airline costs on the other hand, have nearly tripled in recent times in spite of the rising demand for airline tickets. However, there is no value in paying exorbitant rates for airline tickets, when the same ticket can be purchased for a much lesser price by making use of these simple tips to look for competitive deals and rates online.

Plan & Book Ahead of Time: This is one of the simplest and easiest ways to save on airfares. In case of business travel, this may not always be feasible as business trips come up all of a sudden and it is difficult to plan for. However, when you are planning a family vacation, you very well know when it is going to take place. It is important to book the airline tickets as soon as the intended date of travel is finalized. This way, you are in a better position to get low rates and good discounts on airfare prices. Give yourself at least six weeks time in advance to book flight tickets especially if you plan on traveling during holiday season such as Christmas.

Shop Around: The internet is a massive source of information that everybody has access to. Perform enough research and gather as much data as possible from various ticketing websites in order to get the best deal. This will enable you to compare prices of all the airlines and also narrow down your choice according to the date flexibility and number of stops. You may also check the airline websites to see if they are offering any seasonal discounts. All this will help in securing a good deal! If you are going to fly from the U.S check websites such as Bootsnall and Cheaptickets.com. From U.K, look into Flightcenter and from India you can check websites such as MakeMyTrip and Yatra.

Make Use Of Regional Hubs: If you are planning on flying to South Africa, look for direct flights that fly regionally to smaller countries such as Zambia, Namibia, Botswana or Madagascar. For East Africa, regional flights to Ethiopia and Kenya offer nice deals on package tours and also have extensive regional connections. If you are flying to West Africa, Delta and South African Airways have their regional hub in Senegal which enables them to give good deals. For flying to North Africa, local airlines for the route will be cheaper than flying direct from other countries such as the U.S.

Fly via Europe or Dubai: Flying via Europe will be an inexpensive option, especially during the off-seasons such as November to mid-December and January to March. Turkish Airlines might be a good option as it flies to over 17 destinations in Africa and layovers in Istanbul also work out cheaper than other layover destinations. Flying through Dubai on Emirates will enable you to get good deals to destinations such as Seychelles, Mauritius, Nairobi, Johannesburg etc. Qatar Airways too, has a commendable African network with shorter stopovers. All these airlines also offer great service with minimal layovers.

Avail the Services of an Experienced Travel Agent: Make sure to avail the services of an experienced travel agent who specializes in international travel. They are experts and can give good guidance on when to travel and enable you to get good deals. They have good networks with major airlines and hotel accommodation agencies and might be able to give you a good package deal. Always check with them for packages that include a Safari or other adventure tours along with the airfare. Many travel agencies offer such all inclusive deals that will help you to keep your overall cost of travel low.

By employing these simple tips, your trip to Africa can in fact prove to be a much less costlier affair than what you expected it to be!

Author Bio:

Keerthana Karthik is a blogger who writes on travel tips and destination guides. She, at present, blogs for emperortraveline, a reliable and authorized  travel agency that provides holiday packages, domestic and international cheap flight tickets booking, train tickets booking, Passport and Visa services.


Email Us at FlightAfricablog@gmail.com

Friday, September 14, 2012

Low Voltage Tube Buffer

Bermodal pengetahuan nol mengenai tube dan rasa penasaran dengan review penggemar audio yang bilang  suara tube itu bikin kuping seger, maka dengan sangat terpaksa saya mau nyoba nyicip barang aneh ini, mudah2an hasilnya gak sebagus yang saya bayangkan, bisa bahaya kalo ntar malah pindah aliran ke tube...bahaya kesetrum dan yang paling parah adalah bahaya kantong jebol !!! =D
Karena ini proyek tube pertama, jadi nyari yang low voltage aja, berikut skema yang saya ambil dari beberapa web audio dan forum tercinta SF :)











Seperti biasa, pake jurus pamungkas ``kira-kira`` =D, lha wong sama sekali gak tau dasar2 tube jadi ya ngumpulin skema, dibandingin, dipahamin kesamaanya, dimengerti, dicoba, dirakit, trus didengerin....*mudah2an gak nyampe tahap dikoleksi ...^^
Akhirnya diputuskan nyontek pake skema dari Bapak AW-Tubelover yang saya dapet dari salah satu thread di Solfegio Forum, alesanya udah banyak teman2 SF yang bikin dan banyak dapet tips2 di thread tersebut, terutama dari pemilik blog INI :)


Amunisi generik...











 Heater pake DC, supply sementara ngikut GC...


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Proyek pertama tube saya langsung jalan normal. FYI, waktu saya nulis ini, baru aja kelar nyolder & langsung dinikmati....=D
Ada sedikit kendala, sekunder trafo paling kecil 10 Volt-an, so setelah di regulasi jadi sekitar 14 VDC, buat drop tegangan saya pake regulator 7805, ditambah dioda clamper (bener gak yah??) 4 biji agar out mendekati 6,3 VDC, nah karena selisihnya cukup jauh, si 7805 panas !!! biarin aja dah, sembari nyari trafo lagi...=D
Setelah pake buffer tube ini yang paling meningkat signifikan adalah hi dan mid. Treble jadi panjang, tadinya cris...jadi crissssssshh, vocal begitu menonjol tapi masih tipis :(  , instrumen2 jadi lebih detail, tapi low jadi melempem :( . Untungnya, saya masih banyak Amplifier nganggur, jadi bisa pilih mau pake ampli yang mana....=D

Setelah dipake lebih dari seminggu, trus coba bypass buffer tube ini -karena ada ada hum dikiiit-, perasaan suara jadi jelek. Mudah2an cuma sugesti aja, bukan karena memang bumbu tube bisa bikin lebih enak =D, yang paling kerasa itu detail jadi hilang kalo buffer di bypass, raungan efek crybaby-nya Slash  jadi malu-malu, beberapa instrumen jadi ngumpet juga, ibaratnya kaya kasus video dibawah ini (lebay dikit) :