Mobile audio power amplifier

EE 38 January 1986 Its modest dimensions and battery operation make this amplifier eminently suitable for use out of doors: at garden parties, sporting events, boating galas, to name but a few. It might be classed as a good-quality PA (public address) amplifier in view of its better frequency response than usually found in run of the mill PA units. MOBILE AF POWER AMPLIFIER by Arno Sevriens Table 1. Correlation of input voltage, output power, and supply voltage. Table 1. Supply Supply voltage current 12 V (+6 V) 1A 12 V 1+6 V) 2A 24 V (± 12 V) 3A 24 V (+ 12 V) 6A 36 V ( +18 V) 5A In contrast to hi-fi power amplifiers, which are designed for low distor- tion, high slew rate, low noise, and good damping factor, public ad- dress amplifiers must meet different requirements. Among these are high output power, good reliability, and robustness. Generally, low supply voltages result in relatively low power outputs. This is, however, not the case in the pres- ent amplifier, as shown in Ta...