README

Author: pschatzmann

README.md

@@ -35,6 +35,7 @@ As “Audio Sinks” we will have e.g:
 - external DAC – [I2SStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_i2_s_stream.html)
 - Analog output e.g. with an Amplifier – [AnalogAudioStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_analog_audio_stream.html)
 - with a Piezo Electric Element – [PWMAudioStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_p_w_m_audio_stream_base.html)
+- external SPDIF/TOSLINK Amplifier - [SPDIFStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_s_p_d_i_f_stream.html)
 - Bluetooth Speakers – [A2DPStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_a2_d_p_stream.html)
 - Serial to display the data as CSV – [CsvStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_csv_stream.html)
 - Encoding and Decoding of Audio [EncodedAudioStream](https://pschatzmann.github.io/arduino-audio-tools/html/classaudio__tools_1_1_encoded_audio_stream.html)