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BrianGT - Non-Inverted Gainclone - LM3875TF

Gainclone #5

The latest incarnation of this amp is shown in the picture below. It now consists of 4 identical BrianGT LM3875 Premium Rev A kits for bi-amping duties.

Similar kits are available from:

More information on Chipamp.com, AudioSector and mad about sound can be found at:

Parts

 

Part

No.

 

LM3875TF*

1

 

1,500uF 50V Panasonic FC capacitor*

2

 

22k ohm Caddock resistors*

2

 

680 ohm Riken resistors*

1

 

Gainclone PCB*

1

 

Binding posts – isolated

2

 

RCA – isolated

1

* parts were included in BrianGT premium kit.

Power supply

 

Part

No.

 

Rectifier PCB*

1

 

MUR860 diodes*

8

 

4u7F 50V Black Gate N capacitor*

2

 

Antrim G2415 22–0–22 225VA toroid

1

Notes

The 0R1 5 watt resistors on the output are for testing the amps in parallel mode.

When using just one pair of amps, there is a noticeable hum. Shorting the inputs of the spare pair of amps reduces this hum to normal levels.

Picture

Typical Schematic

Note: The Zobel network, C3 and R5 were not part of the original BrianGT LM3875 kits.


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