IR sensor with LM324


I built the circuit below with the IR sensor on the bread board
A large bowl of snow was brought inside the house to the sense the snow
Varied the 50 K pot (20 turns on the pot)
No buzz output from sensor

Any suggestions on what is going wrong?

Thanks


---+-------+----------+----------- +5 -------- LM785 (NTE equivalent one) (Vin) + 9V - |
| | | | |
| | 100K | |
| | | | |
| | +-----[22K]-------+ | |
50K pot | | 1/4 | | |
| |\| | |\ 324 | | |
ref(A)+-----|+\ +------|+\ | | |
IR in | | >--. | | >-----+-+--|| | |
-------|-----|-/ `-|<--|---+--|-/ | | piezo(5V-9V) | |
| |/| 1N914 | | |/ | +| | |
| | 100K +----[100K]-' | | |
| 1/4| | | | | |
100K 324| | === 0.2uF (B) | | |
| | | | | | |
-----+-------+----------+---+----------------+--------------------------------------------- GND

.

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