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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Just so you know... posted by E-Stat on July 25, 2024 at 10:16:56:
I think the term (digital) come from the way the output is generated. These are a PWM or pulse width modulator where the output is not linear like A or AB, B but a switch closure between a high or low power supply voltage.
IF that switch is very fast but is only "on" 10% of the time, the power delivered is 10% of what would be possible if the load were connected directly to the power supply.
The up side is unlike a linear output where the device dissipation is the current times the voltage across it, the switch is either on or off, neither condition dissipates much energy.
The trick is, the switching frequency has to be much higher than the highest audio frequency in question, typically at several hundred KHz.
The higher the switch frequency, the easier it is to make the low pass filter that turns this into analogue and then, the easier it is to "close the loop" around the output.
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Follow Ups
- RE: Just so you know... - tomservo 07/25/2411:47:03 07/25/24 (5)
- You're mistaken - E-Stat 12:23:45 07/25/24 (4)
- RE: You're mistaken - tomservo 15:04:18 07/25/24 (1)
- Ok - E-Stat 15:07:47 07/25/24 (0)
- RE: You're mistaken - hahax@verizon.net 13:39:24 07/25/24 (1)
- Exactly - E-Stat 13:55:54 07/25/24 (0)
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