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Allo Volt+ & Stepped Attenuator - Standalone Amplifier

Allo Volt+ & Stepped Attenuator - Standalone Amplifier
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£ 74.99

The TPA3118 class D amplifier IC is a leap in terms of audio quality! The Volt+ & Stepped Attenuator Amplifier Board from Allo is a standalone implementation, designed to work with any DAC via the RCA input.

- Using TPA3118 (better grounding of main IC)
- Anti-Pop circuit
- Bootstrap snubber mod
- Brand name components as per picture
- Radio avoidance switch (to reduce interference)
- PCB with extra copper (since on transient’s current can spike to 5A)


  • Volt+ Amplifier Board & Stepped Attenuator, Pre-assembled in Acrylic Case
  • Volt+ Board
    • This class D amplifier goes up to 2 x 50W Max
    • The components used are specifically designed for high end audio devices (Würth Inductor, TI chipset, film capacitors and ± 1% thin film resistors)
    • VOLT AMP boasts 4 output filters, 4 EMI Snubbers, 4 bootstrap capacitors and gain setting components
    • We are using CM filter circuits in power section to reduce maximum ripples in power
    • We are using 10K logarithmic Potentiometer for Volume control. Available with different Input connectors: 2 x RCA
    • Comes in two flavors (Volt and Volt+)
    • Power Supply Required: 16-24V (we recommend 19V), 60-90W
    • Power Connector Jack Barrel size: 3.00mm ID (0.118"), 6.50mm OD (0.256")
  • Stepped Attenuator
    • 10k Value
    • E192 standard resistors with 24 step Attenuator
    • Ladder type structure, 0-23 (24) positions
    • Log scale attenuation
    • Rotary is Made-before-break

Technical Specification

  • Volt+ Board
    • Chipset TPA3118D2
    • Output 2 x 50W (Max) into a 4 to 8-? BTL Load
    • Class D Operation 90% POWER EFFICIENCY
    • SNR 102dB
    • Supply Voltage UP TO 24V DC
    • Operating Temperature -40°C to 85°C Ambient
    • Board Size LWH = 82.83mm * 125.5mm * 40.2mm
    • DC Connector Size 3mm x 7.3mm
    • Mating Plug Size 3mm x 6.5mm
    • Board Weight 230g
  • Stepped Attenuator
    • Type Log Attenuation
    • Resistance 10K
    • Attenuation 0-75dB
    • Resistor Standard E192 (SMD)
    • Channels 2 (Left and Right)
    • Steps 24 (0-23)
    • Resistor Network Ladder
    • Dimensions Height: 81.2mm
    • Diameter: 39mm
    • Weight 82g

Please Note. The PCB comes in two flavours:

  • Volt is a shield and beneath it has connector that will plug into our DACs (Piano and Piano 2.1). It has no RCA inputs. (Capacitance Multiplier can be added as a standalone board).
  • Volt+ is a standalone amplifier with RCA IN (stereo). In addition to everything that the Volt has, we have added a circuit in the power supply that will reject spikes and noise to about 60db. The name of the circuit is "Capacitance Multiplier". Please note that Class D amplifier needs a quiet PSU. Volt+ can be used with our DACs through the RCA input, as a standalone board.