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Remove Noise from DC circuit

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SurekhaIris

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I need to eliminate the noise from DC circuit.here is attached circuit. NoiseIssue.JPG

I got the distored waveform acrose 7.5 K resistor.

Please help me to remove the noise, i have place the ceramic cap of value 100nf in parallel with 7.5 K resitor, but the still issue is remains same.

please help me out, i am very new in Power design
 

What is the input voltage?
May be you need to increase zener current, try to reduce resistor proportionally.
 

When LAMP(Load) is off it is open ckt vtg 400v, and When lamp is ON it is 100V.

Input vtg is the HID LAMP vtg.
 

try with different value capacitors parallel to 7.5k
 

I have tired with many ceramic capacitor upto 200nf 50v but the still it does not correct the pure dc vtg, and when i am using ellectrolytic cap other design ckt does nt work with it as it does nt provide the ignition vtg.

is their another solution.
 

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