We want a siren. So to generate an up and down going signal tone, the resistor R2 is fed from an RC circuit. When the switch S1 is pressed, the capacitor C1 charges via R1 slowly until it reaches the ...

Figure 1 The behavior of the RC topology is still simple when you replace the resistors with an active circuit that synthesizes a ... Technology LTC6915, are available. But this Design Idea describes ...

The controller is FAN2306, which is a constant-on-time controller from Fairchild Semiconductor. The circuit parameters are: V IN = 12V V O = 1.2V F SW = 500kHz L O = 1µH C O = 4x47µF MLCC R T ...

With the ripple injection circuit added in the waveform on the right the jitter is reduced to ~200ns and the output voltage ripple peak-peak reduces. The ripple injection circuit is very small, ...