Since the last weeks i'm designing different DI Boxes in business card Format

Active DI Box works with easy to get standard electronics parts.

The passive Version works with different High End Transformators

Lundahl LL1935

Jensen JT-DB-EPC

Pikatron ÜP3096M

Cinemag CM-DBX

Palmer PMT02

Both DI Boxes have An Pad, GndLift and Merge Switch. Active Version can run on 2x9V Battery. Passive Version have a Polarity Switch.

I also did comparison with different DI Boxes to find out how different they sound, the difference in Level

P96DI Lundahl LL1935 -> 0.0dB

P96DI Jensen JT-DB-EPC -> -1.7dB

P96DI Pikatron ÜP3096M -> -3.9dB

P96DI Palmer PMT02 -> -0.2dB

A72DI -> +7.0dB

Bo Hansen -> +7.2dB

Behringer DI 400 -> +0.6dB

Sound samples can be found here

https://soundcloud.com/linkaudiodesign/sets/di-box-comparison

Boards available in my White Market Thread or with every bigger order one is for free

White Market Thread

https://groupdiy.com/index.php?topic=76303.0

All Build Info(BOM,Schematic/Overlay/Stepbuild) will be avaivable under this link

https://docdro.id/FRChuxO

Parts for the units

passive one

INPUT,THRUW NRJ6HF 2xNRJ6HF

X1 NC3MAH 1 x NC3MAH

T1 JENSEN 1 x CM-DBX/JT-DB-EPC

T2 LUNDAHL 1 x LL1935

T3 PALMER 1 x PMT02

T4 PIKATRON 1 x UP3096M

RPAD1 0207_10C 1 x 4k7

RPAD2 0207_10C 1 x 510R

RFGNDLIFT1 0207_10C 1 x 51R

RPAD3,RPAD4 0207_10C 2 x 7k/6k8

C1 C050-075X030 1 x 10nF

GNDLIFT,PAD,180°,MERGE ALPHAMINIDPDT 4 x ALPHA SWITCH

active one

R8 0207_10C 1 x 100k

RPAD6 0207_10C 1 x 4k7

R7 0207_10C 1 x 100R

R9,R12,RPAD2 0207_10C 3 x 100k

R10 0207_10C 1 x 1m

R11,R13,R2 0207_10C 3 x 47k

R14,R15 0207_10C 2 x 680R

R17,R18 0207_10C 2 x 6k8

RFGNDLIFT1 0207_10C 1 x 51R

RPAD1 0207_10C 1 x 510R

RPAD3 0207_10C 1 x 2k2

RPAD4,RPAD5 0207_10C 2 x 7k/6k8

PAD,GNDLIFT,MERGE ALPHAMINIDPDT 3 x ALPHA SWITCH

C7,C4 C025-050X025 2 x 47pF

C10 C050-075X030 1 x 10nF

C14,C15 C050-075X030 2 x 1nF

C1 C050-075X080 1 x 1µF

C8,C9 CE-020X050 2 x 22µF50V

C6,C2 CE-020X050 2 x 10µF50V

C5 CE-035X100 1 x 470µF25V

IC3 DIL08 1 x TL072

D1,D5,D6,D7,D8,D11,D2 DO41-10 8 x 1N4005

D4,D9 DO41-10 2 x ZF6.2

LED KK-156-2 1 x LED

2X9V_BATTERY KK-156-4 1 x KK-156-4

X1 NC3MAH 1 x NC3MAH

INPUT,THRUW NRJ6HF 2 x NRJ6HF