A high performance generator with integral power amplifier. The signal generator can produce sine, triangular and square waveforms. The locakable frequency control operates over six ranges covering 0.09Hz to 110kHz. The very low frequency available allows a moving coil meter to be driven to illustrate a.c., and enables a wide range of experiments to be conducted with a vibration generator. The power amplifier output can deliver 6W rms into an 8 Ohm load. It is ideal for experiments in sound where there is ample power to drive a loudpeaker or vibration generator.