![]() ![]() Segregation is normally assured in a power supply by maintaining a minimum distance around all parts that are connected to the mains, including spacing between the primary and secondary of the transformer. ![]() One of the important but forgotten functions of a power supply is to ensure a safe segregation of the low-voltage circuitry, which may be accessible to the user, from the high-voltage input, which must be inaccessible. Safety is discussed in greater depth in Section 9.1. Major safety risks for power supplies are the threat of electric shock due to contact with “live parts,” and the threat of overheating and fire due to a fault. Peter Wilson, in The Circuit Designer's Companion (Fourth Edition), 2017 7.4.3 Safety Approvals The advent of Power Supply Unit Designer Version 2 freeware in 2003 has transformed the design of linear supplies, but an understanding of the underlying principles enables much faster convergence to an optimum design. Often, the supplies for the pre-amplifier and power amplifier will be derived from the same power supply, which is frequently integral to the power amplifier, but this need not be so. Valve amplifiers need a DC High Tension (HT) supply and one or more heater, or Low Tension (LT) supplies, which may be AC or DC. If the power supply is poor and has insufficient energy to meet the amplifier's peak demands, then the most beautifully designed amplifier will be junk. It is most important to realize that an amplifier is merely a modulator and controls the flow of energy from the power supply to the load. Since they are designed after the amplification stages, it is tempting to think of them as an afterthought indeed, some commercial products reflect this attitude. ![]() Power supplies are designed from the output back to the input. Morgan Jones, in Valve Amplifiers (Fourth Edition), 2012 Publisher SummaryĪ power supply is a device that converts one voltage to another more convenient voltage while delivering power. ![]()
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