LM1875t amplifier circuit LM1875 30W

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LM1875t amplifier circuit LM1875 30W, Circuit of audio power amplifier 30W. The lm1875 is a monolithic audio amplifier that offers a very low distortion and a performance of high quality for projects of audio amplifiers. The lm1875 supplies 20 watts in loads of 4 Ohms or 8 Ohms.

The LM1875 delivers 20 watts into a 4Ωor 8Ωload on±25Vsupplies.  Using  an  8 Ω load  and±30V  supplies,  over  30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown. The  LM1875  design  takes  advantage  of  advanced  circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding  features  include  high  gain,  fast  slew  rate  and  a  wide power  bandwidth,  large  output  voltage  swing,  high  current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.

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The LM1875 is a monolithic power amplifier offering very low distortion and high-quality performance for consumer audio applications.

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The LM1875 delivers 20 watts into a 4 or 8 load on ±25V supplies. Using an 8 load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.

The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.

LM1875T Features

  • Up to 30 watts output power
  • AVO typically 90 dB
  • Low distortion: 0.015%, 1 kHz, 20 W
  • Wide power bandwidth: 70 kHz
  • Protection for AC and DC short circuits to ground
  • Thermal protection with parole circuit
  • High current capability: 4A
  • Wide supply range 16V-60V
  • Internal output protection diodes
  • 94 dB ripple rejection
  • Plastic power package TO-220

 


Schematic Lm1875 amp

Lm1875T Amplifier Circuit Lm1875 30W Circuit Diagram
Lm1875 Amp Schematic

PCB layout for Lm1875

Lm1875T Amplifier Circuit Lm1875 30W Circuit Diagram Pcb Printed Circuit Board

Lm1875T Amplifier Circuit Lm1875 30W Circuit Diagram Pcb Printed Circuit Board
Lm1875 Amp Pcb Layout

Bor for circuit

Component Valor
Resistors 1/4 Watts 5%
R1, R6 1,5k — Brown, Red, Gold
R2, R3, R4 22k — Red, Red, Orange, Gold
R5 220K — Red, Red, Orange, Gold
R7 1 Watt 5% 1R — Brown, Black, Gold
R8 1M — Brown, Black, Green, Gold
Capacitors
C1 100nF — Ceramic Capacitor – 104, 100n, 0.1
C2,C3 3300µF/35V — Polarized Electrolytic Capacitor
C4, C5 2.2µF/25V — Polarized Electrolytic Capacitor
C6 220nF/63V — Polarized Electrolytic Capacitor — 220n, 224, 0.22
C7 100µF/25V — Polarized Electrolytic Capacitor
C8 2200µF/35V — Polarized Electrolytic Capacitor
Semiconductors
D1, D2, D3, D4 RL207 — 2A diode
LED LED 5MM – Led any color
IC1 LM1875T Audio amplifier integrated circuit
Connectors
CN1 (IN) Audio Input Connector
CN2 (AC) Power connector, connect the transformer.
CN3 (OUT) Audio Out Connector
Miscellaneous: Solder, box for assembly, 2 Amp 20 Volt transformer, wires, etc.

The electrolytic capacitors were considered for a transformer power supply up to 20V. For a trafo of up to 28V, use capacitors with a working voltage of 50V.

Last Update: 04/08/2021 13:40

For more information, see the lm1875T datasheet.

Download files to assemble the amplifier – Includes printed circuit board in PDF, PNG and Gerber
Download

Mirror

Download PDF datasheet LM1875

PSpice Model (Rev. A)

TINA-TI Spice Model (Rev. A)

TINA-TI Reference Design (Rev. A)

 

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2 thoughts on “LM1875t amplifier circuit LM1875 30W”

  1. Is the LM1875 is the same as the TDA2030A and how do you power this amp, and does it have a potentiometer and what size well thank you.

    Reply

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