Home   Fox Delta  Projects School Projects Buy PCBs Buy Kits Contact   
 Introduction to Sound Card Interface & Radio Modems:




SC1: Simple Sound Card Interface:

SC2: Advanced, Sound Card & Echo link Interface


 SC2 : Sound Card Interface:
SC2 for Echolink Gateway by I2HUM
  Click to enlarge


 SC2: Sound Card Interface

Click the photo to enlarge

Metal cases no longer available for this project.


SC1 kits were very popular and ran out of stock quickly.

Work immediately started on new design SC2. I decided to make the new interface with following points in mind:

1. VOX PTT Activation for tone operation.

2. RJ45 for Transceiver Connection.

3. D9F Serial Connector For standard COM Port Connection.

4. USB connector to get +5V for Echo link operation

5. Isolation for: Audio in, Audio Out, COR & PTT

6. High quality 600 ohms audio transformers

7. Powering option by using a battery.

8. Front Panel Mounted RX/TX Audio Level Controls

9. Front Panel Switch to put-off VOX operation.


The soundcard interface detailed here is not different from many made by amateurs and available commercially. This one includes TinyEcho like interface capability for Echo Link operation.

However, I have made it simple to construct and easy to use. On this interface, you have a RJ45 connector for your transceiver. A 1Meter long CAT5 cable (8core) is supplied with Male RJ45 Connector. All you need to do is decide on how you will apply PTT and make connections to your rig for: Mic Audio, Radio Audio & PTT to your radio's Mic Connector. If you intend to use this interface for Echo link, Isolated COR  is available.

You have choice to use this interface with or without DC Power. It will work equally well in both situations. Great for your Portable Rigs. In addition, +5V to power COR circuit is possible by using an USB cable, especially for LapTops.

SC2 kits are now supplied without a metal case.


Picture of the Assembled SC2 Sound Card Interface:
                   Fox Delta SC2: Sound Card & Echolink Interface

Click the photo to enlarge


SC2 Connector Side:

Click the photo to enlarge



 Technical Details & Schematic:


SC2 Sound Card Interface Doc.
SC2 Schematic & Parts List
Schematic SC2  JPG
Schematic VOX Circuit


SC2 Kit Parts List

Component Data Sheets

 Project Component Datasheets

With sound Card Interface, you can use many software available either as a freeware or shareware. Please go thru following links & find one suitable to your communication requirements.
Collection of Digital Communication Software
More Digital Communication Software links
Look under "Digital Communication" and Packet, Amtor, CW, Pactor etc.


 Free Software Utilities Download
Wave Generator


 Buy Sound Card Interface On-line
To purchase, please select online credit card buttons or send payments by USPS Money Orders.

For online payments, shipping charges will be added on secure web page, which are from $5.00 upwards for Registered Air Mail, and based on value/weight of the KIT/Assembled.

For Money Order, please refer to table provided on MO web page.

"Buy from 2CO", you may pay using your CC or funds from Paypal.


Terms of sales    Countries where we do not sell/forward   
Track your order guide
US $    

Buy From 2CO          


In Stock

SC2 Sound Card Interface Kit  OUT OF STOCK
Kit Packing List


PCBs may be available from our shop at:  Foxdelta.net Visit Foxdelta.net



2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
 Project Categories:
 Discussion Forum