2 channel 100W min AF Power Amplifier (Dual Supplies) STK4231II

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  Posted by momename - September 2, 2012 at 9:33 pm

If you want to create the 100 watt OCL audio amplifier circuit. I want you to consider this circuit as one. It uses STK4231 IC products to create a simple, small and best economical.

How it works.
The STK4231 is Hybrid IC of Sanyo, in the family of STK4201II. Can provide a high power output to 100 watts per channel. And When connected to the bridge adapter with output altitude of about 400 watts is incredible.
-Built-in muting circuit to cut off various kinds of pop noise.
Greatly reduced heat sink-due to case temperature 125 degrees Celsius.
-Excellent cost performance.
As this circuit, we can design the OCL amplifier 100 watts each channel. Will see that, this circuit consists of only a few external components.
-The capacitor C9,C10 is used to reduce noise at high frequencies.
-The input coupling capacitor are Bolt C1,C11.
The C2,C12 is defined low frequency cut off point that Which can be calculated from the formula :

F=1/6.28 C2xR5

2-channel-100w-min-af-power-amplifier-circuit-by-STK4231

Note: two capacitor C2,C12 is defined gain ratio at low frequency but will be must over high Because, while open this circuit will be has a noise “thub…b.b.b” out to your speaker.

- The boost trapping capacitor are C3 and C13. If the value is too low, resulting distortion increases torque at low frequency.

- To reduce oscillation by C5, C8. which reduces the impedance of the power supply circuit to suit the use of IC.
- Setting gain ratio of circuit, which is defined by R5 = 560 and R4=56K will be total gain is VG = 40dB.
If you want to change the rate of expansion, it should change the R5.
The idle current is defied by R21,R22.

2-channel-100w-min-af-power-amplifier-s-power-supply

The power supply circuit
This our circuit use dual voltage positive – negative 50 volt and current is 5 Amp, we so use power supply as this figure which.
How to build.
It’s very easy to create, even if you are a beginner. It is important to place the devices correctly follow circuit diagram.
2-channel-100w-min-af-power-amplifier-pcb
In this figure is PCB and putting position the parts. The IC shouls be hold with the big heat sink.


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