Hi David the Bear,
R2 should be 47k, not 4k7.
R1 should be 200 ohms not 220n.
I don't knpow what U1B and the pile of parts connected to it are for. They bias pin 2 of U1A at +2.5V which is not necessary since U1A is simply a follower for the DC voltage at its input pin 3. C12 causes its high frequency AC gain to be its maximum (about 32 times at 53kHz) which you probably do not want.
Instead, the input pin 3 of U1A needs to be biased at +2.5V.
The modulation input of the FM oscillator is only maybe 50mV, not 3.8V so the opamp does not need any gain.
I don't know if U1A will oscillate when it tries to drive the 470pF capacitor C5 as its load.
R2 should be 47k, not 4k7.
R1 should be 200 ohms not 220n.
I don't knpow what U1B and the pile of parts connected to it are for. They bias pin 2 of U1A at +2.5V which is not necessary since U1A is simply a follower for the DC voltage at its input pin 3. C12 causes its high frequency AC gain to be its maximum (about 32 times at 53kHz) which you probably do not want.
Instead, the input pin 3 of U1A needs to be biased at +2.5V.
The modulation input of the FM oscillator is only maybe 50mV, not 3.8V so the opamp does not need any gain.
I don't know if U1A will oscillate when it tries to drive the 470pF capacitor C5 as its load.