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Chip Amps Amplifiers based on integrated circuits

An Experiment with TA7222AP audio chip
An Experiment with TA7222AP audio chip
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Old 9th June 2019, 12:06 PM   #1
Anirvan is offline Anirvan
diyAudio Member
 
Join Date: Apr 2019
Smile An Experiment with TA7222AP audio chip

Hi everyone!!

I'm back with yet another wonderful experience playing around with audio amps. Any music lover like me will always be ready to build a Nice and Powerful amplifier whenever they get hold of all the stuffs and ideas. So, I also got an audio chip from my old Onida make crt tv and decided to build another Nice amp for myself. After getting the diagram from datasheet and the components I finally made the amp but when I powered it up from my DIY supply , there was no sound at all!!

I totally broke down into tears. When I closely looked at my circuit , I found that I had accidentally bridged the pins 2 & 3 of the chip while soldering. Pin 2 being the ripple and Pin 3 being the mute pin. So I corrected the mistake and powered it up again with a hope that this time the amp will rock!!

But again to my surprise the amp started making howling noise. So I connected a 4.7 uF capacitor to its Pin 2 (ripple) and ground. But still the amp was making noises. Then I connected a 2.2 ohm resistor with the 0.1uF capacitor at its output pin and ground hoping that this may resolve the issue. But again I became frustrated with the noise. So, Finally I connected a 220 ohm resistor and 47 uF capacitor between pin 5 (feedback) and ground hoping that this may be the cause of noise and howling due to excessive gain. This time I was correct and amp started making nice, clean and powerful sound!! :-)

So, conclusion is that datasheets are always not correct but may be misleading to new Tinkerers :-|
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Last edited by Anirvan; 9th June 2019 at 12:09 PM.
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