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ultra low noise power supply and low noise amplifier
ultra low noise power supply and low noise amplifier
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Old 11th October 2017, 01:25 PM   #1
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
Default ultra low noise power supply and low noise amplifier

power supply based on LT3045, use 4 mm banana plug. low noise amplifier based on Wenzel LNA, 0.65 nV.
Attached Images
File Type: jpg 823A9436.jpg (609.3 KB, 491 views)
File Type: jpg 823A9448x.jpg (303.9 KB, 456 views)
File Type: jpg 823A9448.jpg (187.1 KB, 456 views)
File Type: jpg 823A9448y.jpg (194.7 KB, 458 views)
File Type: jpg lna-1.jpg (401.7 KB, 448 views)
File Type: jpg lna-2.jpg (699.6 KB, 113 views)
File Type: jpg lna-3.jpg (166.2 KB, 176 views)
File Type: jpg lna-4.jpg (224.8 KB, 226 views)
File Type: jpg 823A9448z.jpg (360.2 KB, 218 views)
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Old 12th October 2017, 03:59 AM   #2
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
This power supply has two independent DC outputs, which can be configured in series to be +-15V maxim. 2.54 mm jumper for switching between fixed and variable output and current limit, no soldering is needed. Here is the schematic of the power supply.
For schematic of LNA, please google "wenzel low amp".
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File Type: pdf Protel Schematic0107.pdf (22.2 KB, 181 views)
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Old 12th October 2017, 08:37 AM   #3
trobbins is offline trobbins  Australia
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Do you have a spectrum plot out further than 20kHz, and logarithmic to show what happens at low frequency?
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Old 12th October 2017, 11:18 AM   #4
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
Here is the picture of LNA with input shorted to gnd at 1000X gain. It takes a lot tweaking to get rid of the 50 Hz ac line related hum. I will test spectrum of the LT3045 PSU at low frequency in a few days.
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Last edited by ambrosia168; 12th October 2017 at 11:46 AM.
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Old 12th October 2017, 09:08 PM   #5
ApolloZhang is offline ApolloZhang  Europe
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Looks nice! Are you planning to sell them on ebay or Taobao?
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Old 12th October 2017, 11:02 PM   #6
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
ebay, maybe. Taobao, no.
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Old 12th October 2017, 11:36 PM   #7
Mark Johnson is offline Mark Johnson  United States
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ultra low noise power supply and low noise amplifier
It looks like the entire PSU assembly floats independently of earth ground.

I'm not sure it's a great idea to call the Ch1_Vminus and CH2_Vminus terminals "GND_01" and "GND_02" in the Protel schematic. They're not really ground and they're not connected together.
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Old 13th October 2017, 12:21 AM   #8
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
Quote:
Originally Posted by Mark Johnson View Post
It looks like the entire PSU assembly floats independently of earth ground.

I'm not sure it's a great idea to call the Ch1_Vminus and CH2_Vminus terminals "GND_01" and "GND_02" in the Protel schematic. They're not really ground and they're not connected together.
Yes, you are right.
It floats,for the PSU. It dependents on the configuration. If two independent DC outputs(+1V to +15V, each output) are required, the switch on the front panel goes to "INDEP." position, and GND_01 and GND_02 can be connected together on the other board(powered by this PSU) and connected to ground earth. If +-1V to +-15V are required, the switch on the front panel goes to "SERIES" position, and +15V_02 is connected to GND_01(+15V_01 as positive output, GND_01 as GND, GND_02 as negative output, and GND_01 can be connected to ground earth).
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Old 13th October 2017, 02:43 PM   #9
ambrosia168 is offline ambrosia168  China
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ultra low noise power supply and low noise amplifier
Here is another picture of spectrum of this LT3045 power supply.
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