Posted on Feb 5, 2014

Making 90 degree phase shift on VHF. This IQ Oscillator is easy way with two logic IC`s. 74AC04 inverter is used as oscillate circuit. C5 and R6 is phase shifter. 74HC14 has a duty to convert into square-wave. It is usualy used 74HCU04 in crystal oscillator circuit. Buffer of 74AC04 cause parasitic oscillation. So I teste

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d with 74HCU04 first, but the result was not good for me.

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