Circuit Project Electronic

The circuit has both square-wave and triangle-wave output. The left section is similar in function to a comparator circuit that uses positive feedback for hysteresis. The inverting input is biased at one-half the Vcc voltage by resistor R4 and R5. The output is fed back to the non-inverting input of the first stage to control [...]

That circuit is based on a 14-pin DIL IC capable of producing sine, square, triangular, sawtooth and pulse waveforms of high accuracy and stability. The frequency may be selected to be from 0.001Hz to 1Mhz, Frequency modulation and sweeping can be accomplished with an external voltage and the frequency can be programmed digitally by resistors [...]

The simple Function generator two waveform, It produces triangle and 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 [...]