Anybody would have few 2N4856, 2N4857 or 2N4858, and few 1 G ohm resistors ? - diyAudio
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Old 20th December 2011, 08:39 PM   #1
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Default Anybody would have few 2N4856, 2N4857 or 2N4858, and few 1 G ohm resistors ?

Hello

Anybody would have few 2N4856, 2N4857 or 2N4858, and few 1 G ohm resistors ?

Thank you

Bye

Gaetan
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Old 21st December 2011, 12:49 AM   #2
Enzo is offline Enzo  United States
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Location: Lansing, Michigan
Mouser has 2N4857 in stock.


Good luck on the G-ohm resistors. WOuldn't a space of open air be about that much?
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Old 21st December 2011, 01:55 AM   #3
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Location: Western Sydney
re: ' 1 G ohm resistors ' - I managed to get some from RS components, might be a good source if you have a branch locally.

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Old 21st December 2011, 05:18 AM   #4
Enzo is offline Enzo  United States
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Location: Lansing, Michigan
Actually Mouser has dozens of types of 1G resistors, I just didn;t hunt them down. They even have a 10 watt one. The largest resistor I saw there was 2.1G ohms
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Old 21st December 2011, 05:27 AM   #5
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Hello

I have myself few Brüel & Kjaer 4145 mics capsules, unpolarised capacitor mic that needed a 200V polarisation voltage, but I don't have a power supply/preamps.

So I will use this HP15118A mic preamp schematics as a preamp and a 200v voltage regulator.

condensermicpreampHP15118Amicpreamp - HostingPics.net - Hébergement d'images gratuit

Q1 1855-0020 = SFE793--2N4856 or 2N4857
Q2 1854-0307 = BCY 57/LV2345---bc109, 2n930
CR1 51.1V 5% Zener
CR2 1901-0376 = 1N3595 ----35V working 2 pF at 0V low leakage.


Thank

Bye

Gaetan
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