Precision Voltage Divider - diy - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd July 2008, 10:19 PM   #1
diyAudio Member
 
redrabbit's Avatar
 
Join Date: Oct 2004
Default Precision Voltage Divider - diy

This is for the old-school test junkies...

I bought a precision resistor set, encased in an oil bath.

Click the image to open in full size.



I know that the 3 megs in series is 9meg...which gives me a standard DC decade voltage divider when tapped between these resistors in series...(with an overall impedance of 10 meg. )

Click the image to open in full size.

But.... what about the other resistors ? I don't recognize them as part of a standard configuration.
Do you ?

=RR=
  Reply With Quote
Old 24th July 2008, 12:32 AM   #2
diyAudio Member
 
redrabbit's Avatar
 
Join Date: Oct 2004
It also works this way, but with the 9 meg resistor near the 0v (ground). I don't know if there is a difference. ??

http://i5.photobucket.com/albums/y17...4_schem_v2.gif

=RR=
  Reply With Quote
Old 24th July 2008, 03:32 PM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
11k11+10k+90k+90k+900k+10M=11M10111.
if the empty space is filled with 10k then 11k11/11M11111=-120dB
__________________
regards Andrew T.
  Reply With Quote
Old 24th July 2008, 04:16 PM   #4
Corax is offline Corax  Germany
diyAudio Member
 
Join Date: Feb 2005
Location: south of lower saxon
@AndrewT:
Well, ~11k divided by ~11M is ~1/1000 which would be round about -60dB(!) (more or less exactly -59.993...dB) and not -120dB(?).

However you point in the correct direction!

@redrabbit:
If you put 11k11+10k+90k in series and measure the voltage across the 11k11 you get -20dB (-20.00078...dB). There supposed to be a few more combinations, but because of lack of exercises with such a resistor 'array', I forgot most of the other combinations. So please excuse me.
However, in the days of computers it should be quite easy to figure out all other possible combinations for the dB-scale. And as far as I remember a connection table should be provided with that box, so you don't have to reinvent/recalculate all possible/usefull combinations. But once your PC has calculated all combinations ... (keep that table for any further use).

Anyhow - good luck.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Voltage divider to reduce 6v dc to 2vdc duderduderini Tubes / Valves 5 26th February 2008 09:28 PM
Caps in Voltage divider Heater Bias ? Renron Tubes / Valves 1 4th December 2007 05:14 PM
voltage divider+Aikido anawat Tubes / Valves 0 17th October 2007 05:19 PM
Pearl: replace zener D1 with voltage divider? h_a Pass Labs 14 22nd February 2007 12:43 PM
Resistor values in feedback loop/voltage divider??? vynuhl.addict Solid State 29 13th February 2007 02:05 PM


New To Site? Need Help?

All times are GMT. The time now is 07:32 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2