µC forms FM oscillator

Posted on Sep 8, 2012    9855

A project required an inexpensive oscillator whose frequency increased step by step from 200 to 400 Hz and then decreased to 200 Hz. The first step was to design a VCO with a staircase driver. However, this approach entailed at least four ICs and many discrete components. An alternative method (Figure 1) requires only one 16-pin µC (an MC68HC705KJ1, costing less than $1) and only a few external components.

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