Allo.com VOLT Technical Manual

Brand
Allo.com
Model
VOLT
Type
Technical Manual

Allo.com VOLT is an audio amplifier that takes the variable output analog audio from the Piano DAC and through the onboard Texas Instruments TPA3118D2 Class D amplifier delivers audio to the volt speaker terminals. The VOLT board requires a 19volt power source to operate and boasts 4 output filters, 4 EMI Snubbers, 4 bootstrap capacitors and gain setting components. This class D amplifier can deliver up to 2 x 50W Max into a 4 to 8-Ω BTL Load with 90% POWER EFFICIENCY and a SNR of 102dB. Its compact size (LWH = 58mm * 86.75mm * 32.

Allo.com VOLT is an audio amplifier that takes the variable output analog audio from the Piano DAC and through the onboard Texas Instruments TPA3118D2 Class D amplifier delivers audio to the volt speaker terminals. The VOLT board requires a 19volt power source to operate and boasts 4 output filters, 4 EMI Snubbers, 4 bootstrap capacitors and gain setting components. This class D amplifier can deliver up to 2 x 50W Max into a 4 to 8-Ω BTL Load with 90% POWER EFFICIENCY and a SNR of 102dB. Its compact size (LWH = 58mm * 86.75mm * 32.

VOLT (Audio Amplifier)
TECHNICAL MANUAL
VOLT
Volt is an audio amplifier shield and beneath it has connector that will plug into Piano Hi-FI DAC
and Piano 2.1 Hi-FI DAC. Volt takes the variable output analog audio from the Piano DAC and
through the onboard Texas Instruments TPA3118D2 Class D amplifier delivers audio to the volt
speaker terminals.
The VOLT board requires a 19volt power source to operate. Power should be applied to the
3mm DC JACK. Capacitor Multiplier can be added as a standalone board to VOLT power input.
The Volt is by default muted at power on (mute LED lit). Mute & Shut down state is under
software control.
Top Side Volt Bottom Side Volt
Features and Specifications:
• 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 ± 0.1% thin film resistors)
• VOLT AMP boasts 4 output filters, 4 EMI Snubbers, 4 bootstrap capacitors and gain setting
components
• And Additional Provision for stepped attenuator volume control
Chipset
TPA3118D2
Output
2 x 50W (Max) into a 4 to 8
-Ω BTL Load
Class D Operation
90% POWER EFFICIENCY
SNR
102dB
Supply Voltage
UP TO 24V DC
, 5A
Operating Temperature
-40°C to 85°C Ambient
Board Size
LWH = 58mm * 86.75mm * 32.06mm
Board Weight
120g
HEADER PIN OUT DETAILS
VOLT 16 WAY HEADER PIN OUT DETAILS
RPI
SPARKY
PIN PIN
SPARKY
RPI
5V
5V
1 2
5V
5V
NC
NC
3 4
NC
NC
SDA1-I2C
TWI2_SDA
5 6
GPIOB14
GPIO4
SCL1-I2C
TWI2_SCK
7 8
GPIOB15
GPIO17
NC
NC
9 10
GPIOB16
GPIO27
NC
NC
11 12
GPIOB30
GPIO24
GPIO23
SDZ_AMP(B31)
13 14
MUTE_AMP(B17)
GPIO22
GND
GND
15 16
GND
GND
VOLT 8WAY HEADER PIN OUT DETAILS
SIGNAL
PIN PIN
GND
1 2
AUDIO RIGHT
3 4
AUDIO RIGHT
5 6
GND
7 8
* Highlighted signals only used on VOLT board
VOLT – Audio Amplifier Board Block Diagram
AM Avoidance Switch Settings
To reduce interference in the AM radio band, theTPA3118D2 has the ability to change the
switching frequency via AM<2:0> pins. We provided switch configuration on VOLT board.
0 = switch towards ON Position, 1 = Switch off position
Default Setting: SW1 – AM2 = ON, AM1 = ON, AM0 = OFF (0, 0, 1)
The US and EU AM bands are similar so you may be able to use the same AM settings for both regions.
Sparky + KALI + Piano DAC + Volt
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Allo.com VOLT Technical Manual

Brand
Allo.com
Model
VOLT
Type
Technical Manual

Allo.com VOLT is an audio amplifier that takes the variable output analog audio from the Piano DAC and through the onboard Texas Instruments TPA3118D2 Class D amplifier delivers audio to the volt speaker terminals. The VOLT board requires a 19volt power source to operate and boasts 4 output filters, 4 EMI Snubbers, 4 bootstrap capacitors and gain setting components. This class D amplifier can deliver up to 2 x 50W Max into a 4 to 8-Ω BTL Load with 90% POWER EFFICIENCY and a SNR of 102dB. Its compact size (LWH = 58mm * 86.75mm * 32.

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