thx for your reply...
"They are not all that noisy"

--- that's the first time I've ever heard that. Since a buck converter is a switching regulator doesn't that automatically imply that's it is noisy? Full of high freq. Noise?? And I also tried a Mini-360 DC-DC Buck converter with same results.
Specifications:
MPS MP2307DN buck regulator IC
4.75 - 23VDC input voltage
1.0 - 17VDC selectable output voltage
3A surge current, 1.8A continuous rated current
Maximum conversion efficiency of 95% (5Vin, 3.3Vout ~200mA output)
340kHz switching frequency
30mV no-load output ripple
0.5% load regulation
2.5% voltage regulation
The switching regulator is causing high freq noise..??
I need to make this work by Saturday and would like to use materials o have already. I haves boxes of components.