diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 70b26ae..09f9589 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -10,10 +10,6 @@ IF(SDR_WITH_PORTAUDIO)
 
  add_executable(sdr_afsk1200 sdr_afsk1200.cc)
  target_link_libraries(sdr_afsk1200 ${LIBS} libsdr)
-
- qt5_wrap_cpp(sdr_schumann_MOC_SOURCES schumann.hh)
- add_executable(sdr_schumann sdr_schumann.cc schumann.cc ${sdr_schumann_MOC_SOURCES})
- target_link_libraries(sdr_schumann ${LIBS} libsdr libsdr-gui)
 ENDIF(SDR_WITH_PORTAUDIO)
 
 
diff --git a/examples/schumann.cc b/examples/schumann.cc
deleted file mode 100644
index 75ffcbb..0000000
--- a/examples/schumann.cc
+++ /dev/null
@@ -1,2 +0,0 @@
-#include "schumann.hh"
-
diff --git a/examples/schumann.hh b/examples/schumann.hh
deleted file mode 100644
index 8738233..0000000
--- a/examples/schumann.hh
+++ /dev/null
@@ -1,106 +0,0 @@
-#ifndef SCHUMANN_HH
-#define SCHUMANN_HH
-
-#include <libsdr/sdr.hh>
-#include <libsdr/gui/gui.hh>
-
-class Schumann: public sdr::gui::SpectrumProvider, public sdr::Sink<int16_t>
-{
-  Q_OBJECT
-
-public:
-  explicit Schumann(QObject *parent=0)
-    : sdr::gui::SpectrumProvider(parent), sdr::Sink<int16_t>(),
-      _buffer_idx(0), _avg_count(0), _buffer(2048), _spectrum(2048),
-      _spec_count(0), _avg_spectrum(2048), _subsample(0), _Fs(0), _fft(_buffer, sdr::FFT::FORWARD)
-  {
-    // init spectrum and buffer
-    for (size_t i=0; i<2048; i++) {
-      _buffer[i] = 0;
-      _spectrum[i] = 0;
-    }
-  }
-
-  virtual ~Schumann() {
-    // pass...
-  }
-
-  void config(const sdr::Config &src_cfg) {
-    // Requires type, sample rate & buffer size
-    if (!src_cfg.hasType() || !src_cfg.hasSampleRate() || !src_cfg.hasBufferSize()) { return; }
-
-    // Check buffer type
-    if (sdr::Config::typeId< int16_t >() != src_cfg.type()) {
-      sdr::ConfigError err;
-      err << "Can not configure Schumann: Invalid type " << src_cfg.type()
-          << ", expected " << sdr::Config::typeId<int16_t>();
-      throw err;
-    }
-
-    // Check input sample rate
-    double Fs = src_cfg.sampleRate();
-    if (40 > Fs) {
-      sdr::ConfigError err;
-      err << "Can not configure Schumann: Input sample rate too low! The Schumann node requires at "
-          << "least a sample rate of 40Hz, got " << Fs << "Hz";
-      throw err;
-    }
-
-    // Compute subsample
-    _subsample = Fs/40; _Fs = Fs/_subsample;
-  }
-
-  void process(const sdr::Buffer<int16_t> &buffer, bool allow_overwrite) {
-    for (size_t i=0; i<buffer.size(); i++) {
-      // Add value to buffer
-      _buffer[_buffer_idx] += float(buffer[i])/((1<<15)*_subsample); _avg_count++;
-      // If subsample count is reached:
-      if (_avg_count == _subsample) { _buffer_idx++; _avg_count = 0; }
-      if (_buffer_idx < 2048) { _buffer[_buffer_idx] = 0; }
-      if (_buffer_idx == 2048) {
-        // Compute FFT and add to spectrum:
-        _fft();
-        _spec_count++;
-        for (size_t i=0; i<2048; i++) {
-          _spectrum[i] += _buffer[i].real()*_buffer[i].real() + _buffer[i].imag()*_buffer[i].imag();
-          _avg_spectrum[i] = 10*(_spectrum[i]/_spec_count);
-          std::cout << _avg_spectrum[i] << "\t";
-        }
-        std::cout << std::endl;
-        _buffer[0] = 0; _buffer_idx=0;
-        emit spectrumUpdated();
-      }
-    }
-  }
-
-  bool isInputReal() const {
-    return true;
-  }
-
-  double sampleRate() const {
-    return _Fs;
-  }
-
-  size_t fftSize() const {
-    return 2048;
-  }
-
-  const sdr::Buffer<double> &spectrum() const {
-    return _avg_spectrum;
-  }
-
-protected:
-  size_t _buffer_idx;
-  size_t _avg_count;
-  sdr::Buffer< std::complex<float> > _buffer;
-  sdr::Buffer< double > _spectrum;
-  size_t _spec_count;
-  sdr::Buffer< double > _avg_spectrum;
-  size_t _subsample;
-  double _Fs;
-  sdr::FFTPlan<float> _fft;
-};
-
-
-
-#endif // SCHUMANN_HH
diff --git a/examples/sdr_schumann.cc b/examples/sdr_schumann.cc
deleted file mode 100644
index 3de44cc..0000000
--- a/examples/sdr_schumann.cc
+++ /dev/null
@@ -1,40 +0,0 @@
-#include <libsdr/sdr.hh>
-#include <signal.h>
-#include <libsdr/gui/gui.hh>
-
-#include <QApplication>
-#include <QMainWindow>
-#include "schumann.hh"
-
-
-using namespace sdr;
-
-
-
-int main(int argc, char *argv[])
-{
-  QApplication app(argc, argv);
-
-  sdr::PortAudio::init();
-
-  sdr::PortSource<int16_t> src(32000, 1024);
-  Schumann schumann;
-  src.connect(&schumann);
-
-  QMainWindow *win = new QMainWindow();
-  sdr::gui::SpectrumView *view = new sdr::gui::SpectrumView(&schumann);
-  win->setCentralWidget(view);
-  win->show();
-
-  sdr::Queue::get().addIdle(&src, &sdr::PortSource<int16_t>::next);
-
-  sdr::Queue::get().start();
-  app.exec();
-
-  sdr::Queue::get().stop();
-  sdr::Queue::get().wait();
-
-  sdr::PortAudio::terminate();
-
-  return 0;
-}