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Old 13th January 2012, 08:29 AM   #11
madtecchy is offline madtecchy  England
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They look to me like axial ceramic multi layer composition. depending what they are doing in the circuit changing to metalised polyprops may do more harm than good.

Regards Ian

Last edited by madtecchy; 13th January 2012 at 08:42 AM.
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Old 13th January 2012, 08:40 AM   #12
davidsrsb is offline davidsrsb  Malaysia
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220 = 22pF and would have been a reasonable NP0 or COG dielectric.
102= 1nF and 103 =10nF would have been X7R and not much good if the value actually matters.
I am not sure what the "028" is
The ferrite part is a 200uH shielded inductor, it looks like a good quality part
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Old 13th January 2012, 10:39 AM   #13
DF96 is offline DF96  England
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Quote:
Originally Posted by embrown057
The 201k may be a 200Mh choke.
200mH (or 200uH).
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Old 13th January 2012, 12:06 PM   #14
Enzo is offline Enzo  United States
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You read the numbers on the caps in picofarads as if you were reading a color code on a resistor. So 221 would be like red-red-brown, and would mean 220pf. 103 would mean the same as brown-black-orange, so 1-0-000pf, same as 0.01uf or 10nf.
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Old 13th January 2012, 12:17 PM   #15
bzhei is offline bzhei
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Join Date: May 2011
Quote:
Originally Posted by madtecchy View Post
They look to me like axial ceramic multi layer composition. depending what they are doing in the circuit changing to metalised polyprops may do more harm than good.

Regards Ian
i checked the circuit, the 220 caps are paralleled with a 33kohm resistor and used between the op-amps + input to RCA ground lead. the 103 caps are also paralleled with a 33kohm resistor but this time in a feedback loop from op amp output to inverting input. a 104 is used between +12 supply to gnd of the equipment itself.
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Old 13th January 2012, 12:27 PM   #16
bzhei is offline bzhei
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Join Date: May 2011
Quote:
Originally Posted by davidsrsb View Post
220 = 22pF and would have been a reasonable NP0 or COG dielectric.
102= 1nF and 103 =10nF would have been X7R and not much good if the value actually matters.
I am not sure what the "028" is
The ferrite part is a 200uH shielded inductor, it looks like a good quality part
i just removed the cap with 028 marking. it actually read SE 103 on the other side. the 028 must have been a manufacturer code. thanks
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Old 14th January 2012, 10:07 AM   #17
davidsrsb is offline davidsrsb  Malaysia
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The inductor is 220uH, not 220mH. A 220mH ferrite choke would be enormous.
Actually values of the order of 100uH are typical for these low power switching power supply chips
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Old 14th January 2012, 01:24 PM   #18
embrown057 is offline embrown057  United States
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Thank you David for the correction, your correct.
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