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 1nF Polyester Poly Film Capacitor,102,100V,5%, 20 PCS US $3.99 
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 1.5nF Polyester Poly Film Capacitor,152,100V,5%, 20 PCS US $3.99
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 39nF Polyester Poly Film Capacitor,393,100V,5%, 20 PCS US $3.99
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 Lot of 2 Philips Capacitor Poly Film 7500pF 2000V MMKP US $1.00
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 6 inch Greenhouse Poly Film Repair Patch Tape US $34.95
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 100nF 0.1uF 104 Polyester Poly Film Capacitor,100V,x 10 US $3.99
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 4 inch Clear Greenhouse Poly Film Repair Patch Tape US $27.95
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 HP 51642B -36IN X 120FT MATTE FILM POLY/ - Kit US $145.02
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 Polyester poly Film Capacitors 100nF-100V 104 ±5% 50PCS US $3.50
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 BearAcade Self-Adhering Sticky Poly Sheeting Film US $214.50
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 10 CAPACITORS 1.5UF 400v 105c metaliz. poly. film axial US $10.00
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 Polyester poly Film Capacitors Assortment Ki 102~474 US $52.00
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 (2) ELPAC .047UF 50V 1% POLY FILM CAP NEW/NOS US $5.90
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 (2) 0.33UF 400V METALIZED FILM POLY CAP MPA/TSC AUDIO AMP NEW/NOS US $4.90
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 (2) 3.3UF 30V M83421/01-1299P CRC METAL POLY FILM CAP NEW US $9.80
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 (6) 1UF 63V 5% POLY FILM BOX CAP NEW US $4.95
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 (25) CDE DME6P22K 0.22uF 630V Metal Poly Film Capacitor US $10.99
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 5pcs 1uF 400V 105 Metallized Poly. Film Capacitor 105J US $3.99
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 4 GE .015uf 100VDC Poly Film Guitar Tone Capacitors NOS US $3.99
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 .047uF 160v dc ERO - METALIZED POLY-FILM CAP Axial Leads (LOT OF 5) US $7.50
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 (2) NYTB 0.001UF 100V 1% POLY FILM CAP NOS/NEW US $7.90
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 Polyester poly Film Capacitors 10nF 100V ±5% 20PCS US $2.00
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 Dixie Satin-Pac® High Density Poly Film S-15 Ctn of 10M US $80.50
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 Polyester poly Film capacitors 2A104J 100nF 0.1uF 100V 50PCS US $3.50
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Can i use a thin film capaciter insteed of poly capaciter?
i want to create a led lamp and it needs 5uf 400v poly capaciter. But i cant find one, so can i use a same thin film capaciter. You can find the circuit from this link http://www.circuitstoday.com/mains-operated-led-lamp
Oh.. you're running it direct from line voltage.
It should be fine. Polyester caps ARE film capacitors (not "capaciters"). Just a different type of film.
Note that you can use any higher voltage rating. The capacitance value (5 uF) needs to match but the voltage rating of the cap can be higher than what the circuit calls for.
However... be VERY careful when building anything line-powered... and very, very, VERY careful when you don't have a power transformer.
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Edit-added: Ner: Sorry but no. This job doesn't need a very accurate capacitance; 10% will do fine and that is easily achievable by thin film Cs.
And by the way, the term for good tolerance, a small amount of error, would be "low tolerance", not "high tolerance."
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edit-added2: Lare, the surge problem is why they specified 1n4007 diodes. Those have a reverse breakdown voltage of 1000V. If you get a surge bad enough to short those your entire house is going to be in a world of hurt anyway. You can always put a 500V MOV across the input to cover that base if you want.
Nevertheless I agree with the "death trap" evaluation. The only thing beginning electronics builders should be doing with line voltage is running it through a fuse and a power transformer primary. If that.