Continued from LAST MSG
And i am using a center tapped transformer....9-0-9V (rms)...on secondary and primary 220V. The actual voltage values i checked from DVM were....13V for the LM386 amplifier and 26V for the buzzer circuit. I kknow that this 26V value is above the value of capacitor 2200uF which has a value of 25V. but i am here concerned about the LM386 Amplifier circuit. One thing i can do is change the transformer ...use something between 8-0-8V..that will solve this problem....but why there is just noise coming from the chip....
can it be so that the DC voltage i am applying on the chip is above 12V(the rated value of LM386) but that chip should burn out but that chip works when it assemble it in another circuit which i have made other than this PCB. can it be so that..the LM386 produces noise for supply voltage above 12V?
Anyone help me now?
And i am using a center tapped transformer....9-0-9V (rms)...on secondary and primary 220V. The actual voltage values i checked from DVM were....13V for the LM386 amplifier and 26V for the buzzer circuit. I kknow that this 26V value is above the value of capacitor 2200uF which has a value of 25V. but i am here concerned about the LM386 Amplifier circuit. One thing i can do is change the transformer ...use something between 8-0-8V..that will solve this problem....but why there is just noise coming from the chip....
can it be so that the DC voltage i am applying on the chip is above 12V(the rated value of LM386) but that chip should burn out but that chip works when it assemble it in another circuit which i have made other than this PCB. can it be so that..the LM386 produces noise for supply voltage above 12V?
Anyone help me now?