The simple Function generator two waveform. It produces Sawtooth(Triangle) and Pulse(Square) waves from 1Hz up to 1MHz. The Amplitude, offset and duty cycle are adjustable to offer wide range of generated signals. The important part of the circuit is LM566 or NE566.
I used R2 controls Frequency output. The power supply voltage is 9V to 24V.
The LM566 circuit is a general purpose voltage controlled oscillator which may be used to generate square and triangular waves, the frequency of which is a very linear function of a control voltage. The frequency is also a function of an external resistor and capacitor.
The LM566 Circuit Diagram
Maybe cheaper to build your own. Reliable performance.
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