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Old 20th September 2011, 12:01 PM   #111
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I would give the ZTX450 a try, Anton. Why not?

Best regards - Rudi_Ratlos
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Old 20th September 2011, 01:00 PM   #112
Atilla is offline Atilla  Norway
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If I get some good matched pairs, I can give it a shot. But since the datasheet doesn't mention the noise figures, I've no idea if it's good or not. (F.ex. the MPSA18 noise is listed 1.5dB, while the BC550 is 4dB)
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Old 20th September 2011, 01:21 PM   #113
evette is offline evette  Canada
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Mr. Rudi you wouldn,t gain anything. Evette
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Old 20th September 2011, 01:21 PM   #114
tome is offline tome  Macedonia
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Hi Rudi
I pay to you yesterday on your bank acc, I hope I'm on your list
regards
tomas
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Old 20th September 2011, 02:31 PM   #115
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Tomas,

you are of course on my list.

Best regards - Rudi_Ratlos
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Old 20th September 2011, 03:12 PM   #116
tome is offline tome  Macedonia
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thanks
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Old 22nd September 2011, 09:37 AM   #117
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Dear TO-3 SYMASYM friends,

I am happy to tell you that I received a confirmation of the etching company telling me that the PCBs will be etched and shipped on September 30th.

I will then have the PCBs on Wednesday, 4th of October and will meet Sascha, who will do the shipping, on the weekend 8th / 9th of October.

I suppose that most of you will have the PCBs in week 41 (10th to 15th of October).

Best regards - Rudi_Ratlos
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Old 23rd September 2011, 09:58 AM   #118
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Atilla View Post
ex. the MPSA18 noise is listed 1.5dB, while the BC550 is 4dB)
at what Ic and what frequency range and what source resistance?
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Old 23rd September 2011, 10:04 AM   #119
Atilla is offline Atilla  Norway
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MPSA18: Vce = 5.0V , Ic = 100uA, Rs = 10k, f = 1.0kHz.
BC550: Vce = 5.0V , Ic = 200uA, Rs = 2k, f = 1.0kHz. (Actually listed all over the range - 10Hz to 15.7kHz)

Edit: The datasheets that list that don't seem to all list it under the same conditions, sadly.

Last edited by Atilla; 23rd September 2011 at 10:07 AM.
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Old 23rd September 2011, 12:07 PM   #120
AndrewT is offline AndrewT  Scotland
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find a datasheet or two or three that have noise graghs for the device.
Plot on those graphs, the two noise figures for the respective devices.
Where these two devices end up, may give you a good clue to how they compare.
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