Minggu, 17 Juli 2011

mini audio mixer

3 channel audio mixer PCB and Parts layout

3 channel audio mixer pcbaudio mixer parts placement

Audio Mixer external wiring layout

audio mixer external wiring

Audio Mixer circuit diagram

audio mixer diagram

skema mini audio limiter

Audio limiter components
R1 = 100K
R2 = 1K
R3 = 1M
R4 = 68K
R5 = 10K
C1 = 10uF
C2 = 680nF
T1 = BFW11
T2 = BC173C
IC = BA741

Audio limiter circuit schematic

audio limiter compressor circuit schematic

6 Band Graphic Equaliser Circuit Using 741 Op-Amp

This circuit is 6 Band Graphic Equaliser ,you can adjust sound in low ,mid and high which circuit used IC 741 Op-Amp. With this circuit you can control and blend frequencies and tones as desired.

Essentially, the circuit consists of an IC 741 whose gain at various freguencies is determined by corresponding potentiometer setting.
6 Band Graphic Equaliser Circuit Skema Rangkaian 6 Band Graphic Equaliser Using 741 Op-Amp
The audiblefrequency spectrum is covered in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are of 100kΩ linear type. The circuit provides adequate boost / cut for normal use.

power supply for the circuit can be derived from the amplifier / preamplifier itself. The wide rangeof supply voltage (6V-20V) makes the circuit very versatile. Power consumption is negligible.

list Component
R1,R2,R3,R4,R5,R6 : 27kΩ     C1: 100n      C6: 300pF
R7:  470kΩ                   C2: 33n       C7: 100uF/16V
R8:  330kΩ                   C3: 10n       C8: 4.7uF/16V
R9:  100kΩ                   C4: 3.3n      C9: 47uF/16V
R10: 4.7kΩ                   C5: 1n        IC1: 741 Op amp
R11: 4.7kΩ
VR1,VR2,VR3,VR4,VR5,VR6: 100kΩ Linear Potentiometers 

13.8V 20A Power Supply circuit without Transformer

Schematic diagram:
Power Supply circuit without Transformer
PCB layout:

Power Supply circuit without Transformer
The circuit featured regulated output, short circuit safe, and with current limiter.