Operating instructions

POWER AMPLIFIER PROTECTIVE CIRCUITS

The new Warwick Jonas Hellborg Power Amplifiers are equipped with a series of circuits to prevent it from destruc-

tion in case of inadequate operating conditions:

Power-up delay: When the unit is switched on, the SPEAKER OUT sockets are activated with a slight delay to

protect the loudspeakers.

Short-Circuit: In the event of a short-circuit at the Power Amp outputs, this feature prevents the output stage

transistors from destruction by quickly reducing current.

HF oscillation: By switching the Power Amp off, this safety feature prevents from damages that could be caused by

frequencies in excess of 20kHz (feedback, etc.).

Excessive

temperatures: Should the temperature-regulated fan cooler prove to be insufficient in extreme conditions, this circuit

protects the output stage transistors from destruction by switching the device off.

Note: The amplifier switches automatically back to playing mode as soon as it detects the fault has

disappeared (e.g. the amplifier has overheated and cooled down again).

PROTECTIVE CIRCUITS