  An interesting analog circuit for simulating a signal with fluctuations
having a probability density function with a power tail has recently been
proposed and constructed. The exponent of the power law can be fixed by tuning
an appropriate circuit element. The proposal is to use the circuit as a
simulator-generator of financial market fluctuations and as a tool for risk
estimations and forecasts. We present a discussion of the stability conditions
for multiplicative noise and an exhaustive analysis of the power law
fluctuation generator in connection with the electronic components and their
parameters. From our studies one can conclude that the proposal is not adequate
to provide a confident experimental scheme to follow the fluctuations of the
financial market due to both electronic implementation and to difficulties in
parameter tuning.
