Simple Function Generator Circuit Diagram
This is a simple function generator circuit that can produce the following waveforms: square wave, triangular wave, and sine wave. The circuit's main components are two 1458 IC's. The 1458 is a dual op-amp IC, i.e., an IC that houses two op amps inside it. The circuit uses four op amps, two from each 1458. The bottom-most op amp in Figure 1 is configured as an astable multivibrator, which continuously generates a square wave. Assume that C1 has no charge initially. The voltage at the inverting input is zero, while the voltage at the non-inverting input is very slightly positive (a ratio of the op amp's output offset voltage as determined by R1 and R2). This minute voltage difference at the inputs is enough to cause the op amp's output to swing to 'high'. When the output becomes high, C1 starts charging up. The voltage at the inverting input soon exceeds that at the non-inverting input, forcing the output to swing to 'low', w...