Simple 1.5V square wave generator

Simple 1.5V square wave generator

This simple circuit uses a single 1.5V battery as its power source and produces a good and stable 1V peak-to-peak square wave at 100Hz, 1kHz, and 10kHz. A useful feature of this circuit is that frequency variations can be achieved by switching only one capacitor at a time. Current consumption is approximately 600 microamps. 

* If a precise 50% duty cycle is required, adjust R1 and monitor the output waveform using an oscilloscope. 

* It can provide a good 500mV peak-to-peak square wave even with a 1V power supply.