Hi Guys
Right then my latest weird and wacky circuit involves the control of a the mute function on an AN5279 Amplifier chip. The amplifier circuit itself is very simple requiring only a minimum of parts to get it running.
This project will run on 12VDC.
2 pins of the chip require 5V as a control voltage. The standby pin needs 5V +VE for the amplifier to be 'ON' A simple resistor potential divider will be used to attain this .
Now the mute pin responds to 2 states or inputs. +VE 5V will mute the output. 0V will un mute the output.
My intention is to use a 7555 timer circuit to control the speed at which this mute happens. I am not looking to turn the mute on and then off when I want this is a permanent cycle running at whatever speed I set the timer to run at.
Now the bit where I lose it is the actual joining of the 7555 output to the mute control. I believe I need a transistor driven by the 7555. The collector goes to +VE supply with 2 resistors in line to form the resistor potential divider for the 5V needed to control the mute.
So when the transistor is off the mute pin gets the +VE 5V so the chip is muted. When the transistor receives a signal from the 7555 it opens and the mute pin is taken to 0V or GND.
I attach a diagram of my intention. Have I got it right as far as the interface of the 7555 to the mute pin is concerned?
regards
Fenris
Right then my latest weird and wacky circuit involves the control of a the mute function on an AN5279 Amplifier chip. The amplifier circuit itself is very simple requiring only a minimum of parts to get it running.
This project will run on 12VDC.
2 pins of the chip require 5V as a control voltage. The standby pin needs 5V +VE for the amplifier to be 'ON' A simple resistor potential divider will be used to attain this .
Now the mute pin responds to 2 states or inputs. +VE 5V will mute the output. 0V will un mute the output.
My intention is to use a 7555 timer circuit to control the speed at which this mute happens. I am not looking to turn the mute on and then off when I want this is a permanent cycle running at whatever speed I set the timer to run at.
Now the bit where I lose it is the actual joining of the 7555 output to the mute control. I believe I need a transistor driven by the 7555. The collector goes to +VE supply with 2 resistors in line to form the resistor potential divider for the 5V needed to control the mute.
So when the transistor is off the mute pin gets the +VE 5V so the chip is muted. When the transistor receives a signal from the 7555 it opens and the mute pin is taken to 0V or GND.
I attach a diagram of my intention. Have I got it right as far as the interface of the 7555 to the mute pin is concerned?
regards
Fenris
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