I know I just posted another project on here not so long ago and I don't want to take the piss but this is definitely something everyone who makes stuff needs
using a 555 timer you can get sine square triangle and integrator waveforms - although it does adjust higher than 1 KHz the waveforms become abit shit after that frequency however upto 1 KHz is plenty!
http://www.paulinthelab.com/2013/07/poor-mans-audio-signal-generator.htmllet me know what you think
www.paulinthelab.com - Stripboard Layouts