The schema is designed based on 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.
source of Triangle Wave and Square Wave Generator schema:
http://www.high-voltage-lab.com/211/triangle-squarewave-generator
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