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Monoblock Power Amplifier with Precision Bias Control
audioXpress
|May 2023
In Part 2, Bruce Gillingham discusses the remainder of the MB1's circuitry, its mechanical design, and its performance measurements
In Part 1, I provided an overview of my MB1 amplifier and discussed its audio path in detail. However, there is more to a successful power amplifier than just the audio path design. Proper power supplies are required and there should be a monitoring/protection function to prevent, or at least minimize, damage to the amplifier and speaker in the event of abuse or component failure. The complete power amplifier is a system. Good system design involves making design trades just as is done with the basic amplifier design, but at a higher level. The mechanical design also provides a contribution to success. Let's start here with the power.
AC Switch
AC power enters the chassis through an IEC inlet filter mounted on the rear panel. The hot side is protected by a 5A panel-mounted slow-blow fuse. On/Standby switching is provided by the AC Switch circuit card assembly (CCA) (Figure 6). It contains two high-current (16A) power relays controlled by the Low Voltage Regulator/Protection CCA.
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