STK4050V 200 watt amp

This 200 watt amp schematic circuit is based  on STK4050V high power audio amplifier IC and is designed do deliver up to 200 watts audio power on a single channel .
STK4050V 200 watt amp audio amplifier IC is pin compatibility with other STK amplifiers series .
Because of current mirror circuit application the distortions are reduced to 0.08 % .
STK4050V supports addition of electronic circuits for thermal shutdown and load-short protection circuit as well as pop noise muting which occurs when the power supply switch is turned on and off.
The maximum output power of STK4050V audio amplifier is around 200 watts on 8 ohms load impedance with a 66 volts split power supply .
If you want to make this power amplifier you need to make a separate thermal protection and load short protection circuit because the IC don’t offer these kind of protection and you can destroy the chip and the speaker box .

Musical light chaser circuit

                                                          Circuit Diagram





Description

Here is a simple state of the art musical chaser circuit that can be used in discotheques or even at home if you are a little music crazy .The working of the circuit is straight forward ,the condenser mic pickup the sound and Q1amplifies it.This signal is fed to clock input of IC1 ,CD 4016.The IC is wired in divide by ten mode.The out put of IC1 is given to clock input of IC2, CD4016.The out puts of IC 2 shown in the right side of IC2 in circuit diagram will run run according to the frequency of the input.Result ,we get 10 lights dancing in the according frequency of the sound available.If no sound is there the first light will glow steady.For saving space only arrangement for connecting only one lamp is shown in the diagram.Make 9 lamp arrangements like the one shown in figure and connect each if them to the each outputs of IC2 with the other ends connected to the circuit as that of one shown in circuit.

The power supply for the circuit is directly derived from the mains itself using D2 , R9,C4,C3 and D3, which adds an extra bonus of avoiding the bulky transformer to make the circuit compact.

Notes

• If the output doesn't respond to the music and only the first light remains glowing, adjust the level of input signal to IC1 by adjusting R1 since the cause of problem is the low voltage level of input to IC1.Problem is solved.
• Some parts of the circuit are live with potential shock hazard.So be careful.

Sound Level Meter

                                                                  Circuit Diagram
 
 

Description

This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone.The heart of the circuit is IC LM 3915 Audio level IC.Even though it is a stand alone IC , a peak detector based on Transistor BC 558 and diode 1N4001 is also included for better performance.

Tips

Supply voltage can be from 3V to 20V.The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1.3V. To make the circuit use a moving dot display instead of bar graph display,Pin 9 can be should be disconnected from +V.

Parts List.
C1 2.2uF 25V Electrolytic Capacitor
C2, C3 0.1uF Ceramic Disc Capacitor
R1, R3 1K 1/4W Resistor
R2 10K 1/4W Resistor
R4 100K 1/4W Resistor
R5 1M 1/4W Resistor
D1 1N4001 Silicon Diode
Q1 BC 558 PNP Transistor
LED1-LED10 Standard LED or LED Array
U1 LM3915 Audio Level IC
MISC Board, Wire, Socket For U1