Tasel

High-performance amplifier. Ultra low distortion but high voltage DC while operated. Using two on-board 6.5A fuses, just cause this circuit is capable of delivering around 300W of music power into 4Ω, each fuse carries around 4.4A RMS or higher.

Before you building a high-power amplifier like this, it’s important to take your time and double-check each stage of the assembly as you proceed. High DC voltages (ie, ±57V) are present on this amplifier module when power is applied. In particular, note that there is 114V DC between the two supply rails. Do not touch the supply wiring (including the fuseholders) when the amplifier is operating, otherwise you could get a lethal shock.

Here is the power supply circuit for Ultra-LD Mk.3 200W Amplifier.

Ultra-LD Mk.3 200W Amplifier Power Supply Circuit

Ultra-LD Mk.3 200W Amplifier Power Supply Layout

[source:SiliconChip]