audio output transformer wiring color code

Can be designed so that virtually no ripple is present on the DC output (in other words the ripple is below the white noise the regulator generates) allowing relaxation of amplifier supply-rail rejection requirements.Having said that, if your amplifier is clipping regularly you might consider turning it down a bit. Clipping behavior will be cleaner, as the clipped peaks of the output waveform are not modulated by the ripple on the supply rails.A regulated supply-rail voltage to a power amplifier gives absolutely consistent audio power output in the face of mains voltage variation.There are, however, still load-dependent losses in the output stage to consider. This is considered to have marketing advantages in some circles, though it is not clear why you would want to operate an amplifier on the verge of clipping. A regulated supply-rail voltage means that the amplifier can be made to approximate more closely to a perfect voltage source, which would give twice the power into 4 Ω than it gives into 8 Ω.This worsens with increasing current drawn. The bridge rectifier will generate bursts of RF at a 100 Hz repetition rate as the diodes turn off. The absence of switch-mode technology does not mean total silence as regards RF emissions.

Transformer primary tappings must be changed for different countries and mains voltages.The mains transformer will be relatively heavy and bulky.Significant ripple is present on the DC output and so the PSRR of the amplifier will need careful attention the problem is, however, not hard (if you read the second part of this chapter) and output hum levels below -100 dBu are easily attainable.

On the other hand, the amplifier will always deliver the maximum possible power it can.

The power into 4 Ω will not be twice that into 8 Ω, because the supply voltage will fall with increased current demand.

The amplifier can deliver higher power on transient peaks, which is just what is required.No possibility of instability or HF interference from switch-mode frequencies.Simple, reliable, and cheap (relatively speaking – the traditional copper and iron mains transformer will probably be the most expensive component in the amplifier).

Audio output transformer wiring color code