description manual driven by 2 lm1875 usa-made ics this amp … · 2019. 5. 1. · lm1875 class-ab...

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XF-AMPS01 Class-AB Audio Amplifier

Features

Stereo Output

Total Output Power: 36W RMS

Volume Control

LED Power Switch

MDF Enclosure

Stand-by AC Power Draw: 3-4W

xform

3

Manual

Specifications

LM1875 Class-AB IC

Load: 4Ω-8Ω/channelInput Impedance: 47k Ohm

Low Distortion: 0.015%,1kHz,20W

Wide Power Bandwidth: 70 kHz

Power Input: 120VAC 60Hz

Operating Temperature: 0-70°C

Description

This is a flat Class-AB audio Amplifier. All modules are made

using though-hole components only, that are soldered to 3mm

traces of single-sided FR-4 PCB. XF-AMPS01 is powered by

regulated dual ±DC power supply that is decoupled from main

via transformer. This unit features large capacitors, large

heat sinks, phoenix connectors and double insulated enclosure.

Driven by 2 LM1875 USA-made ICs this amp is build to last.

Table of Contents

1. Description

2. Wiring

3. Build

4. Dimensions & Weight

5. Diagrams

6. Schemas

7. THD & Freq Response

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WiringAudio Signal Input

Impedance: 47k Ohm

via 3.5mm Male to Male

Stereo Audio Aux Cable

(This cable is included)

Speaker Outputs

Optimal Load:

4Ω-8Ω per channelApplication:

PC/Bookshelf Speakers

(Speakers not included)

AC Power Input

120V AC 60Hz via Polarized Power Cable

IEC-60320 IEC320 C7 to NEMA 1-15P) 6'

(This cable is included)


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LM1875 Channel 1 Amp

M3 Nylon Standoffs

M3 Screws

Fuse

LM1875 Channel 2 Amp

AC to ±VDC Dual Voltage PSU

Transformer Breakout

PART# XFPCB-0004Regulated LM7918 & LM1818 +18 VDC | 0 VDC | -18 VDC

PART# XFPCB-0003LM1875 Class-AB Load: 4Ω - 8Ω

PART# XFPCB-0003LM1875 Class-AB Load: 4Ω - 8Ω

PART# XFPCB-0005120V VCT Transformer(Center Tap) 18-0-18 VAC

3.5mm Input Jack

PART# XFPCB-0006

All Phoenix Connectors

MDF

IEC Polarized C8 AC Input

Class II Double Insulated

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XF-AMPS01 Class-AB Audio Amplifierxform

3

16 cm6.3”3.15”

9.8

5”

Volume Popentiometer

Power Button

25

cm

8 cm

Dimensions & Weight

25cm x 16cm x 8cm

9.8" x 6.3" x 3.1"

Weight 1.75kg / 3.88lb

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Diagrams

66mm

76mm

-18 VDC

GND

+18 VDC

Regulated ±VDC

Voltage Input

Speaker

Output

Audio

Input

LM1875 Amplifier

PART# XFPCB-0003

±VDC Power Supply

PART# XFPCB-0004

+18 VDC

GND

-18 VDC

Regulated ±VDC

Voltage Output

~18 VAC

0 VAC

~18 VAC

76mm

66mm

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Schemas

LM1875 Amplifier

PART# XFPCB-0003

Power Supply

PART# XFPCB-0004

Dual ±DC Output Power Supply

built around LM7918 & LM1818

USA-made IC regulators

Features

Input Voltage Filtering

Low Output Ripple

Voltage Stability to ±0.005VDC

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3XF-AMPS01 Source Files:

https://github.com/xform3

https://xform3.com

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FreeCAD FlatCAMInkscape MA

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E IN CANADA

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description manual driven by 2 lm1875 usa-made ics this amp … · 2019. 5. 1. · lm1875 class-ab...

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