Great Stereo 100W (50W+50W) Amplifier STK 4191-II

Great Stereo 100W (50W+50W) Amplifier

This is build using STK 4191-II

Actually its a good Amp for house use, with a good quality and power if you use a original STK 4191-II  IC

As I'm writing this for Sri Lankan's you can buy a good quality PCB from CROWN PCB produces which comes with a great tone control and a pre-amp.

I've once used that, and it was really great and i have some pictures of it. 

It's really dusty because i haven't used it for some time, but it still works.

some pics

This will cost you about Rs. 1500 with the original IC without the transformer. You should use Dual supplies 28V 3A transformer. It's price varies but normally it cost around 1000 /=.

My most preferred way the heat sink is using a small one with a fan (computer fan which cost about rs.100)

Most importantly you should use this amp with a speaker protector, because any short circuit in the operation will blow you speakers.

Actually all STK Amplifiers are easy to build caz the have a small circuit.

for STK 4191-II here's the circuit,

Resistors:
R1, R18 - 1K/0.5W
R2, R4, R15,R17 - 39K/0.5W
R3, R8, R9, R16 - 1K/0.5W
R5, R13 - 2.2K/0.5W
R6, R14 - 2.2K/0.5W
R7, R11 -100Ω/0.5W
R10, R12 - 4.7Ω/2W

Capasitors:
C1, C14 - 470pf / Ceramic 
C2. C13 - 2.2uf/50V Electrolytic
C3, C12 -100uf/50V Electrolytic
C4, C10 - 47uf/50V Electrolytic
C5, C7, C11 -10uf/50V Electrolytic
C6, C9 - 0.1uf (104) Mylar
C8 - 100uf/50V Electrolytic

For Power Supply follow my previous post. 

For that use

    1). IN 54008 *4 diodes

    2). 4700uf / 50V Electrolytic caps

    3). Fuse before the tranformer

Today in the market you can't find the original IC however the replica ones works same as the original no much of a difference. and also in ebay there's a completed board with the IC. i will link it below.

http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=10&pub=5575320707&toolid=10001&campid=5338163227&customid=&icep_uq=stk+4191&icep_sellerId=&icep_ex_kw=&icep_sortBy=12&icep_catId=293&icep_minPrice=&icep_maxPrice=&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg