PWM amplifier hooked onto a tube preamp
I´m about to build myself a guitaramp. The philosophy is to use a tube preamp (for good distortion) and hook a Class-d power amp onto that, say for an example an UcD-180...
The preamp schematic looks someting like this
How would a class-d amplifier reakt to being hooked onto a preamp like this?
What about the output impedance of the preamp, how would it interact with a PWM amp???
Any general tips or hints on the schematic?
I´m not really good at this so i'm thankful for all support, and I
would humbly ask ypu to keep a modest technical level of your answears so I can understand you folks
This topic can also be found in the "Class-D" section.
I think you will need a cathode follower added to the output in order to drive the low input impedance of a solid state amplifier. The input of a switching ampliier is almost certainly an op-amp, but it will probably have quite a low value shunt resistor (10k is likely). Some Tripath switching amplifiers are configured to be inverting amplifiers and are supplied 49.9k input resistance.
So, I've herad that it's possible to build a little input buffer for the PWM with an OP-amp to ensure that the output impedance is kept low of the tube preamp. I've seen an article i think, but i can't remember where...
Can anyone please make a drawing of such a schematic??
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