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This reference design delivers a 48-V output, low-noise power supply for the phantom power application using the TPS61391 and TPS7A4101 devices. The TPS61391 is a 700-kHz PWM step-up converter that converts. 3.3 V or 5 V to 48.5 V. The TPS7A4101 is a 50-V tolerant input and 0.29-V drop LDO that steps 48.5 V down to.
schematic of a typical phantom-powered electret microphone is shown in Figure 2. Resistors R8 and R9, combined with Zener diode D1, create a simple voltage regulator, dropping the 48-V phantom power to around 5 V to power the op amps in the microphone.
5 Νοε 2019 · Here is a low-ripple and low-noise 48V regulated phantom power supply for an audio preamplifier and driver. Such power supplies require well-filtered, low-ripple and low-noise output voltage with current less than 200mA.
7 Μαρ 2020 · The circuit below is a basic 12 volt phantom power supply that can be constructed in several hours by an electronics hobbyist. It consists of parts commonly available from Mouser or Digikey. This circuit will provide 5 milliamps of phantom power and is designed to operate an electret condenser microphone.
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Anyone involved with audio will know about phantom power, also sometimes known as P48, because the source voltage is (or is supposed to be) 48V DC. The term 'phantom' comes from the lack of any on-board power supply (such as a battery), and the power is delivered seemingly by magic.
19 Απρ 2013 · 48V Phantom Power Supply Circuit Diagram. Its secondary feeds a voltage doubling rectifier formed by diodes D1 and D2 and capacitors C3 and C4. Capacitors C1 and C2 suppress the switching noise produced by the rectifier diodes.
