Generation of triangular wave from passive networks
As already said by others:
RLC-only circuits are linear. Triangle wave contains harmonic frequency components. Linear circuits do not generate harmonics. =&gt; No continuous triangle wave output is possible if the input is a pure sinewave and the circuit is linear.
You need non-linear parts. One possibility is a voltage divider. If the upper half of the divider is non-linear is such way that the current increases steeper than linearly you can well get the wanted result - if you find a nonlinear circuit which behaves in a wanted way. Overvoltage protection VDRs and diodes combined with ordinary resistors can make it, but the result is very sensitive to the amplitude of the sinewave input and temperature changes.
UNDER CONSTRUCTION checking is this really possible