Here is a simple triangle/squarewave generator using a common 1458 dual
op-amp that can be used from very low frequencies to about 10 Khz. The
time interval for one half cycle is about R*C and the outputs will
supply about 10 milliamps of current. Triangle amplitude can be altered
by adjusting the 47K resistor, and waveform offset can be removed by
adding a capacitor in series with the output.
Circuit Diagram
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