STK465组成的2x30W(立体声)放大器及电路(Amplifier2x30WwithSTK465)

STK465组成的2x30W(立体声)放大器及电路 (Amplifier 2x30W with STK465)

Note: The text is AUTO translated from Greek version

A amplifier of acoustic frequencies can be manufactured with discernible materials, despite is known so much the difficulties of finding of materials, what the problem of regulations. These difficulties are overcome relatively easily if we find amplifier in form completed.

Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using minimal exterior elements. Substantially he is height=399 src="/data/attachment/portal/201007/ET35860201007231510532.jpg" width=646 border=0>

The circuit is stereo and has two channels of amplifier in a nutshell. It is a formal designing that develops positively all the particularities completing. Concretely, we observe that the not inverting entry completed (pins 2 and 15, for each channel), is supplied from divider of tendency, which ensures tendency from the tendency of expense completing. At the same time with the entry in each channel, exists a capacitor 470rF, which achieves the unharnessing, in that it concerns the AC components of high frequency, while en line a capacitor 1mF allows in the amplifier to be supplied from desirable flourish acoustic frequencies, fence simultaneous the continuous component. Bronchi unharnessing it is realised with the help of networking of two resistances 33KW and 330W and a capacitor 100mF, which finally ensures factor of aid equal with 100. Finally, at the same time with the exit exists networking RC (0,1mF - 4,7 Ohm) that it attends to the minimisation of phenomenon crossover. The amplifier can be supplied from a line of double polarity. Still it can function under a wide region of tendencies (±10V as ±28V). The requirements of current depend from the force of expense and it can they begin from 120mA up to 1A. It is very important the catering to be sufficiently unharnessing, so that is avoided imports of annoying noises.

The manufacture

For the realisation of manufacture you are consulted the forms 2 and 3 that portray the PCB and placement of materials in this. Does not exist a dangerous element in the manufacture that it should him you are careful particularly, so much at the soldering, what at the use. Be careful the electrolytic capacitors, the placement cooler completed and naturally the polarity of lines of catering. border=0>

Parts

R1 = 1K C1 = 1uF/35V
R2 = 3,3K C2 = 470pF
R3 = 100 C3 = 100uF/60V
R4 = 330 C4 = 100uF/60V
R5 = 3,3K C5 = 10uF/60V
R6 = 1K C6 = 47uF/60V
R7 = 0,33 C7 = 8,2pF
R8 = 33Κ C8 = 0,1uF
R9 = 4,7 C9 = 1uF/35V
R10 = 1Κ C10 = 470pF
R11 = 3,3Κ C11 = 100uF/60V
R12 = 100 C12 = 100uF/60V
R13 = 330 C13 = 10uF/60V R14 = 3,3Κ C14 = 47uF/60V R15 = 1Κ C15 = 8,2pF R16 = 0,33 C16 = 0,1uF R17 = 33Κ R18 = 4,7

IC1 = STK465 LS1 = Speaker 40W 8 or 4 Ohm