Nmos Power Amplifier Series ( Part 3 )
Nmos400
A power amplifier module capable of up to 400 watts into a 4 ohm load
depending on power supply and the output mosfets used. The layout makes
use of older style TO3 mosfets.Nmos400-TO3 Schematic
Nmos350 Mk2
This revised version yet to be built improves a
few perfomance areas. I considered more complex ideas but this increased
the component count and original idea of the amp would have been lost;
that is a powerful high quality amplifier that used commonly available
and cheap components.
- A LED as the voltage reference for the first stage constant current source tracks changes in temperature slightly better that than the old double diode setup.
- A cascode second stage makes it faster and more linear.
- Better clipping attributes
- The fuse has been shifted out of the voltage drive loop between the driver and output stages.
Nmos350 Mk2 Schematic
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This article provides a detailed overview of the NMOS400 and the improved NMOS350 Mk2 power amplifier designs. It clearly explains how the original 400W TO-3 MOSFET-based layout delivers high output power depending on the supply configuration, while the revised Mk2 version focuses on better performance and stability. The design improvements such as LED-based voltage reference, cascode second stage, and enhanced clipping behavior show thoughtful engineering aimed at improving linearity and reliability without increasing unnecessary complexity. It also highlights practical design decisions like simplifying components and improving safety in the signal path, which are important in real-world audio amplifier development and turnkey PCB assembly
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