Violectric HPA V281 Service Manual download pdf (Page 11)

With its small dimensions, the HPA V281 ensures optimum flexibility

combined with high output power. During design, high emphasis was

put on operational safety even when the unit is operated inappropriately.

The HPA V281 is equipped with internal filters to prevent damage to the

connected headphones due to high-frequency overload beyond the

audible range.

THE CASE

The HPA V281's case as well as the front / rear panels are made of

solid aluminium. This choice of material ensures high mechanical

stability and resistance.

EARTH AND GROUND

The HPA V281's case is grounded. Internal reference ground is set to

“LIFT” position ex works but may be reconfigured to “GROUND” position

if required. ( see also: page 7 "Earth/Ground concept", page 32

"Technical Appendix" ).

POWER SUPPLY

Mains power is provided via a three-pin IEC/CEE socket and mating

"cold-appliance" mains cord with Schuko-type plug for units purchased

in middle Europe.

The device is set to 230V mains, whereas the actual voltage may vary

between 190 and 240 volts for flawless operation.

The mains voltage may be altered to 115 V AC supply inside the unit

with the aid of a mains voltage selector. In this case stable operation is

granted in a range of 85 to 120 V (see page 32).

Two toroidal transformers with 15 and 25 Watt are providing the internal

operating voltages of +/-30 V. Out of these voltages some more

operating voltages are generated.

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Violectric HPA V281 Service Manual Page 11