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The simplest phase shift circuit

2015-01-01 16:54  
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The simplest phase shift circuit
In a similar active filter circuit, usually the circuit contains the control phase circuit. This is an experiment only to change the phase of the sine wave phase-shift circuit (phase shifter) . Following diagram shows the phase characteristics of the high-pass filter③ and low pass filter③. ③ high-pass filter can make phase shift between +90 ° ~ 0 °, while the low-pass filter ⑧ only makes phase shift between 0 ° ~ -90 °. here though phase shift is available, there is a weak point that output amplitude will change with the input frequency.