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

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

Other circuits are recommended.

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.

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.

In this figure is PCB and putting position the parts. The IC shouls be hold with the big heat sink.

## 22 thoughts on “2 channel 100W min AF Power Amplifier (Dual Supplies) STK4231II”

1. Please share me the PCB Circuit layout for the STK4321 MK 2 as i will love to try the Making of PCB STK4321 MK2 ..

RGDS
Rakesh Sharma
Call + 91 9762089423.

2. in this circuit how to use 5.1 hometheater used,with stk4231 ic and 8 inch subwoober,and with 100 watts only other speaker or how to use wstts.

3. Bala says:

STK4231 original ic how much price?

4. Hi,Bala
I am sorry,I don’t know its prices now.

Thanks

5. stk 4231 ic
avialable in kerala?

6. Mehedi says:

7. Hi,Mehedi
Or you can look for it in amazon.com

8. hai friends iam raju from yuvaraj Electronics.my bisnes stk amplifiers i want stk 4231-11 components pcb boards please any infarmation

9. Dear,for assembling STK-4231-11,can i use the same pcb configuration used forSTK4141-11?Because i had a stk 4141 circuit working with 30V/5Amps Dc Dual supply,that ic got defective.it may be replaced.STK 4231,is it available at kolkatta market?
Thanks

10. prashant says:

Where availabel at mumbai stk 4231II ic and all type high waatt ics please give me address my self prashant

this ic (stk4231II) IS 200000 rials in iran.

It is old IC that good sound for me.

13. very nice i want to one 1000 watts power amp board good sound your me.

14. LAWRENCE says:

where can i get panasonic sa-vk800 multi amp system STK 470-090 IC

15. david says:

hi. why pin 16 is connected to -50v in pcb and top silk but in schematic pin 16 of stk isn’t connected to -50v? and another question that why do you use 100uF capacitor except 10uF(C7) in top silk?please help.

16. shanmugam says:

please suggest any 5.1 audio for 100watts

17. david says:

Hi momename
what to do?I need your help.

18. david says:

Hi momename
i made this circuit according to the top silk
that you had put in this part for stk.
now I want to say if others want to make this circuit;