D/A to Speaker

[chenjk09]

Hi
check with u guys
the output of D/A to Speaker is pwm?
is because due to weak analog signal correct?
will it work if D/A connect to amp speaker?

 

[audioguru]

A speaker has a very low impedance that cannot be driven by a D/A. An audio amplifier can deliver the high currents required by a speaker. A D/A can easily drive the high input impedance of an audio amplifier.

 

[chenjk09]

Hi,

Output of D/A is analog.
must convert to PWM for playback?

 

[audioguru]

Output of D/A is analog.
must convert to PWM for playback?

The analog output of the D/A converter feeds an audio amplifier. The Digital side of a D/A converter might use PWM but instead probably uses digital numbers to represent the voltage.

 

[chenjk09]

can i say that connect amplifier speaker to D/A?

 

[unclejed613]

no, do NOT connect the D/A to a speaker. connect the D/A to the input of an amplifier, and the output of the amplifier goes to the speaker. whether there's PWM depends on the TYPE of amplifier you use. if you use a class D amplifier, the amplifier will convert the analog signal from the D/A into PWM. if you use a standard analog amplifier (class A, AB or B), the amplifier will simply amplify the analog output of the D/A to drive the speaker.

 

[chenjk09]

Where can I see the class of amplifier of LM386?
https://www.electro-tech-online.com/custompdfs/2012/07/LM386.pdf

 

[audioguru]

The output stage of an LM386 has very low distortion and operates in class-AB with a small amount of idle current provided by the two diodes that keep the same idle current in the output transistors even when their temperature changes. If the output operated without an idle current then it would operate in class-B with awful crossover distortion. If the output operated in class-A then it would get too hot and might melt. If the output operated in class-C then the distortion would be horrible.

 

[chenjk09]

for LM386 is better to use PWM

 

[chenjk09]

I doing a Speech recorder can i still use PWM for my DAC ?