Hello everyone,
I have a discrete class D project that I need help with but since I'm not an analog guy I got a problem. So far I got everything set up and the discrete class D works perfectly. But it outputs a low volume sound due to the DC voltage which is about 6 volts, if I increase the voltage I'll burn my circuit. So How do I increase the volume of the speaker so my circuit can handle up to 35V to get a high volume sound.
on the attachment is the schematic and simulation.
I'd appreciate tips and help.
I have a discrete class D project that I need help with but since I'm not an analog guy I got a problem. So far I got everything set up and the discrete class D works perfectly. But it outputs a low volume sound due to the DC voltage which is about 6 volts, if I increase the voltage I'll burn my circuit. So How do I increase the volume of the speaker so my circuit can handle up to 35V to get a high volume sound.
on the attachment is the schematic and simulation.
I'd appreciate tips and help.
Attachments
I dont have a feedback, why I need it? And feeding back from where? Sorry I'm not expierened with analog circuits.
I don't have a feedback, why do I need it? I'm sorry I'm not experienced with analog circuits.
Emitter resistor of Q1, it's missing.
Edit: Ok I see the shunt feedback via R2. But you still need the emitter resistor because it adds a way to control your DC point. Right now your purple waveform is stuck at -5.5V plus VBE of Q1.
Also your DC levels are all over the place. Pink and yellow (and/or purple, depending on how you do it) should have the same DC level.
Get the green waveform working first, then you can look at adding a post-filter feedback later too.
Also, try simulating with 0V input and audio frequency input first.
Edit: Ok I see the shunt feedback via R2. But you still need the emitter resistor because it adds a way to control your DC point. Right now your purple waveform is stuck at -5.5V plus VBE of Q1.
Also your DC levels are all over the place. Pink and yellow (and/or purple, depending on how you do it) should have the same DC level.
Get the green waveform working first, then you can look at adding a post-filter feedback later too.
Also, try simulating with 0V input and audio frequency input first.
Last edited:
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