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Help explaining SMD Vs. Thru-hole measurements
Help explaining SMD Vs. Thru-hole measurements
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Old 22nd May 2020, 05:18 AM   #11
anatech is offline anatech  Canada
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Help explaining SMD Vs. Thru-hole measurements
No, two in series with opposite polarities to "make" a non-polarized part.

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Old 22nd May 2020, 09:58 PM   #12
Mark Tillotson is offline Mark Tillotson
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Cross over filters will suffer from the very high distortion on electrolytics, since the signal voltages across capacitors are high in filter circuits (unlike DC-blocking caps). Tantalum is a very real fire risk and should be ruled out on that basis alone - over voltage will make them incendiary devices.

10uF as a film-cap is alas a big big and expensive, but definitely available and performant.
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Old 22nd May 2020, 10:25 PM   #13
rayma is offline rayma  United States
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If you want to use these tant parts, connect two (of twice the value needed) in series,
with the positive terminals connected together, to make a single bipolar capacitor.
Throw away the ones that were used singly, since they have been damaged.
The current rating (as well as the voltage rating) of these parts is likely to be too low
for a passive crossover, and they will probably degrade with use.

Bipolar electrolytic types will work better than tants for this application. Use 50V rating, or higher.
SMT electrolytics have much lower current ratings than standard radial electrolytics.
Film types are best, though much larger, but the inside of a speaker is a big place.

Last edited by rayma; 22nd May 2020 at 10:32 PM.
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Old 22nd May 2020, 10:58 PM   #14
tf1216 is offline tf1216  United States
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The parts are used for in-ear monitors like you would buy from a store or see on-stage at a concert. Very low voltage levels are used. The amplifier's output is set at 150mV.

I have used various types of SMD capacitors in the past and never saw any noticeable difference in the frequency response when connected in series with a balanced armature.
An in-depth study was done using multiple 1uF capacitors from tantalum to film at various voltage ratings.

It wasn't until I compared thru-hole components to the SMD ones that there is something happening above 400Hz I can't quite figure out.
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Old 22nd May 2020, 11:03 PM   #15
rayma is offline rayma  United States
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Quote:
Originally Posted by tf1216 View Post
It wasn't until I compared thru-hole components to the SMD ones that there is something
happening above 400Hz I can't quite figure out.
Try again with the capacitors connected as bipolar (two in series with the positive terminals connected together).
A single polarized capacitor cannot work properly in this case, so any measurements will be invalid.
The use of balanced headphones should not make any difference in the measurements.

Last edited by rayma; 22nd May 2020 at 11:08 PM.
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Old 23rd May 2020, 12:31 AM   #16
tf1216 is offline tf1216  United States
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Sorry, not balanced headphones but balanced armatures.

Balanced Armature Drivers • Sonion
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Old 23rd May 2020, 12:41 AM   #17
rayma is offline rayma  United States
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That makes no difference either, since a speaker system is a two terminal network.
The only thing that matters is the voltage difference between the two terminals.

Make sure that the amplifier can work with the your headphones. A balanced amplifier
requires twice the minimum impedance, compared to when it is connected as single ended.
The load impedance may be too low.

Last edited by rayma; 23rd May 2020 at 12:48 AM.
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Old 23rd May 2020, 10:08 PM   #18
PRR is online now PRR  United States
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Help explaining SMD Vs. Thru-hole measurements
Balanced ARMATURE drivers. Not balanced headphones. Not balanced amplifier.

A BA driver is highly efficient but narrow-band audio transducer. They were known in the 1920s for radio speakers, and 1950-2020 for hearing aids and now musicians' in-ear monitors. The typical drive voltage is under 1V. (Hearing aids work on a 1.4V cell.) While some tiny caps have bad voltage curves, probably not what is happening here.

No schematic. All we can do is flail at it. Let him clarify what he is trying to do.
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Old 23rd May 2020, 11:59 PM   #19
tf1216 is offline tf1216  United States
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Thank you for the backup PRR. Attached is the schematic for the midrange I am working with.

There is a damper inserted into a tube that is glued to the spout of the balanced armature.

The schematic for the tweeter is very similar. The capacitor is 1uF and the resistor is 5 ohms.

Basic Schematic 4.jpg

Last edited by tf1216; 24th May 2020 at 12:01 AM.
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Old 26th May 2020, 05:11 AM   #20
1audio is online now 1audio  United States
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Help explaining SMD Vs. Thru-hole measurements
With the hi-K ceramics they have a major voltage coefficient. The same as the source for the distortion. What it would mean is that the response of the system will change with frequency. These parts are common in the IEM's and sometimes quite a few are in there if there are a lot of drivers. You can get 1 uF COG SMT caps and they would be your best option. You may be able to get a 1 uF SMT mylar film that would fit. However the mylar is not as good as COG ceramic. Here is an example: 1825E105K500PHT Knowles Novacap | Mouser Its from knowles who are known for balanced armature drivers, not caps. And its quite pricey. I guess they want in on the headphone goldmine. I'm sure there are others but the Kemet is huge and $68 so its a non-starter.
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