This is working schematic. A Discrete Class D with 2 sets of mosfet at 90Vdc supply will give you enough power to drive 18" speaker at pretty loud.
Don't ask layout
Don't commercialize
Try if you like, as it is. Don't try if you doubt it.
Ltspice file is attached.
Regards,
Kartino
Don't ask layout
Don't commercialize
Try if you like, as it is. Don't try if you doubt it.
Ltspice file is attached.
Regards,
Kartino
Last edited:
Discrete circuits got the advantage that you can repair them even after decades. The feedback after the output choke is a plus too. A more elaborate protection would be quite useful though for PA use.
Are you serious? Have you seen the cost of a low propagation delay, fully differential comparator over a 6 transistor discrete design.?
I have it
But consider cost and footprint 555 is better choice
The same reason for prestage op amp.
Never
This is first version ever I have my own UcD pro.
Later version including fullbridge UcD also very stable.
Wanted to try this, sim first.
Kartino,
I am trying to simulate your design in post 1, for the purposes of the sim leaving out the protection and font end buffers, and am getting a completely intractable -12 or so offset on the output. I am also using 80V supplies as I have several transformers that would give that voltage after rectification and filtering. I have experimented with different transistor types but that doesn't seem to matter, nor does the offset adjustment seem to do anything.
Would yo mind taking a peek at the schematic and see if I'm just blind to a mistake or if you can offer some suggestions on ridding the sim of the offset?
Kartino,
I am trying to simulate your design in post 1, for the purposes of the sim leaving out the protection and font end buffers, and am getting a completely intractable -12 or so offset on the output. I am also using 80V supplies as I have several transformers that would give that voltage after rectification and filtering. I have experimented with different transistor types but that doesn't seem to matter, nor does the offset adjustment seem to do anything.
Would yo mind taking a peek at the schematic and see if I'm just blind to a mistake or if you can offer some suggestions on ridding the sim of the offset?
Does Cartino discret working stable same like D4K5 ?
Who does build this discret Class D Amp ?
Feedback ?
I did buid one based on OP's schematic. I'm however having some problems with it.
At +/- 90V, it seems to distort at about 20-30W output power and when probing with a scope before the output filter, it seems I'm loosing modulation for a fraction of a second - while the amp distorts sound.
Can anyone point me on what to check to fix this behaviour?
At +/- 90V, it seems to distort at about 20-30W output power and when probing with a scope before the output filter, it seems I'm loosing modulation for a fraction of a second - while the amp distorts sound.
Can anyone point me on what to check to fix this behaviour?
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