Rangkaian Audio Mixer 6 Channel

type='html'>

Audio Mixer 6 Channel

The following is a main of the mixer-6 Ch circuit. The circuit constituted by six input channels. The channels are from monophonic channels CH 1-4 and CH 5-6, are intended for stereo use. The number of input channels they want as long Itself Can Increase You Want.

Skema rangaian audio mixer 6 channel

The output of Each channel drives the RV1-6, that regulation potesometer level of sound. With RV7-12 We create conditions of balance Between two channels (BALANCE). All the signals from the input channels in this point are added by two adders [IC1a-b], for Each channel Here exist two Trimmer TR1-2 That adjust the gain of Each IC, adapting the level of signal of the output, in the level That We Want. They Can be suppressed if you do not need something and Standard and Poor. The next stage is a equalizer, three bands of regulation. The IC3α-b, constitute the output of the mixer, they want a one acre have gain and they want the make the essential isolation of the previous stages, with the unit That We Will drives. For whoever they want want they want use headphones, it exists a classic circuit drive of headphones, round the IC2a-b, that give the output in the JF13. It Can Also Also exist optical clue of audio levels, with a stereo VUMETER.

List component

• R1-12=4.7Kohms
• R13-24=10Kohms
• R25-26=22Kohms .
• R27-30-34-39=100ohms
• R28-29-36-37=100Kohms
• R31-42=10Kohms
• R32-41=4.7Kohms
• R33-40=10Kohms
• R35-38=47ohms
• RV1....4=47Kohms Log.
• RV5-6-13=2X47Kohms Log.
• RV7....12=10Kohms Lin. pot. Log
• C1....8=10uF 25V
• C9-11=47pF ceramic or mylar
• C10-12=47uF 25V
• C13-14=100uF 25V
• C15-16=2.2uF 16V
• C18-21=100pF ceramic or mylar
• C19-20=220uF 25V
• TR1-2=4.7Kohms trimmer
• Q1-3=BD139
• Q2-4=BD140
• IC2=NE5532 - TL072

All the Resistors is 1/4W 1% metal film C18-21=100pF ceramic or mylar

for more detail read here

Rangkaian Audio Channel Selector Stereo

type='html'>Audio Channel Selector

This circuit serves for connecting the stereo outputs from Four Different channels as inputs and only one of Them is selected to the output at any one time.

When the circuit switch on, channel A (AR and AL) is selected. If no audio is present in channel A, the circuit Waits for Some time and then Selects the next channel (channel B). This search operation continues Until it detects an audio signal in one of the channels. The inter-channel delay time or the wait Can be adjusted with the help of preset VR1. If still longer time is needed, May replace one capacitor C1 with of higher value.

To manually skip over from one active channel to another active channel, simply push the skip switch (S1), until the desired channel input gets selected. The selected channel (A, B, C, or D) is indicated by the glowing of corresponding LED (LED11, 12, 13, or 14 ).

Skema rangkaian audio channel selector stereo

IC CD4066 contains 4 analog switches, These switches are connected to four separate channels. These analogue switches are controlled by IC CD4017 outputs. CD4017 is a 10-bit ring counter IC. Since only one of its outputs is high at any instant, only one switch will be closed at a time. IC CD4017 is configured as a 4-bit ring counter by connecting the fifth output Q4 (pin 10) to the reset pin. Capacitor C5 in conjunction with resistor R6 forms a power-on-reset circuit for IC2, so that on initial switching on of the power supply, output Q0 (pin 3) is always high . The clock signal to CD4017 is provided by IC1 NE555 which acts as an astable multivibrator when transistor T1 is in cut- off state.

IC5 KA2281 is used here for not only indicating the audio levels of the selected stereo channel, but also for forward biasing transistor T1. As soon as a specific threshold audio level is detected in a selected channel, pin 7 and/or pin 10 of IC5 goes low . This low level is coupled to the base of transistor T1, through diode-resistor combination of D2-R1/D3-R22. As a result, transistor T1 conducts and causes output of IC1 to remain low as long as the selected channel output exceeds the preset audio threshold level.

Presets VR2 and VR3 have been included for adjustment of individual audio threshold levels of left and right stereo channels, as desired. Once the multivibrator action of IC1 is disabled, output of IC2 does not change further. Hence, searching through the channels continues until it receives an audio signal exceeding the preset threshold value. The skip switch S1 is used to skip a channel even if audio is present in the selected channel. The number of channels can be easily extended up to ten, by using additional 4066 ICs.