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Construction Manual for the K2DI v.III and K2DI-PCI boards © EA3BLQ - Revision June 2005

K2DI-PCI

Sound card interface for the K2's K2DI by EA3BLQ

Circuit for a daughter PC board of the K2DI v.III PCB, designed to interface the K2's DI with a computer.

It features Opto isolation for the RS232 PTT circuit, as well as isolation for the sound card connections.

Another remarkable feature is the possibility to choose the PTT mode between RS232 or VOX, according to user preferences.

TR1

RS-232

DB 9

5 - GND

1N4148

4N27

4N32

U2 (a)

TL062

U2 (b)

TL062

4 - RTS

1N4148

7 - DTR

1N4148

5 VDC

4.7

µF

4.7

100K

3M3

10K

,47

µF

5 VDC

Tone PTT

Jumper

10K

500

Ω

470

To P1 AF In (pin 1)

J2 Pin 3

TR2

To P1 AF Out (pin 4)

Atech ATS-075

600:600

PN2222A

BC546

PTT mode Jumper

5 VDC

Digital PTT On

LED

(Optional)

To P1 PTT Line (pin 3)

470

Ω

} Serial PTT (Do NOT jump J3)

} Tone PTT (J3 MUST be jumped)

PC GND

5 VDC

Notes:

All resistors are 1/4 watt and their

value is in ohms; K = 1.000 and

M = 1.000.000

Decimal values of capacitance

are in microfarads ( µF).

NC = No connection.

P1 connects to K2DI J3

P2 connects to K2DI J5

Atech ATS-075

600:600

AF In

AF Out

PTT

GND

SCard's Spkr/Line Out

PC GND

SCard's GND

SCard's Mic/Line In

J2 Pin 4

J2 Pin 2

J2 Pin 1

SCard's GND

1 2 ... 26 27 28 29 30 31 32

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