Stepped Attenuator 100kohm

Wasted · 20th January 2006, 11:06 PM

Hello guys, new to forum and diy audio in general but have brrn bitten by bug, I just seen a passive pre amp that consists of a stepped attenuator and a lot of resistors. There was a link to the site but its all in chinese I thinks. Have fpound other kits but they start at $120 a kit Does anyone know of a site I can find them a little less pricey, Thanks Link to site is
http://www.my3c.net/product/detail.a...=&Sort=&Price=

lineup · 21st January 2006, 02:24 AM

you can buy a good rotator switch ( 12 steps )
then you put your own resistors in ( 12 resistors )
this makes lowest price

you could put a -20dB switch beside the stepped attenuator
so this will cover two different spans of volume ( 24 positions )

there are 24 positions switches to buy, but they cost a lot more

values for a 100 kOhm potentiometer will depend if you want
- linear characteristic - all resistors same value
- logarithmic characteristic - values are progressive, from lower resistors to higher

logarithmic is most often used in audio
this will make you hear same loudness difference for each step
for example -2.5 dB for each step

Wasted · 21st January 2006, 11:51 AM

Thanks lLineup that sounds(Excuse pun) like a way to go if. If can't l learn Korean in the next few weeks then this is the way to go.
By the way here is a link for calculating resistor values for attenuator Haven't tried it myself as I don't have one.

chipco3434 · 21st January 2006, 12:33 PM

Here's one that I ordered....

23 step Vishay with Dales in the kit. I think it's about $55 with the shipping. I don't think there is a better price. It was here within the week.

I have not assembled it yet wut it looks great. This guy is also known as the seller "wanfai" on eBay.

Wasted · 21st January 2006, 06:53 PM

Thanks Guys all very helpful, now whereto next?

chipco3434 · 21st January 2006, 07:03 PM

... for a walk then to finish my Aleph.

Wasted · 22nd January 2006, 11:50 PM

Just one last thing anyone got a good plan for a passive preamp using a 23 step attenuato, I kow I know I tend to get ahead of myself. Put it down to youthful exuberence(Ahem)!

phaeden · 23rd January 2006, 06:26 AM

Here is another site : http://www.diyfidelity.com.au/

I am using one as a passive - much better than a blue Alps and reasonably priced.

Wasted · 23rd January 2006, 08:31 PM

thanks guys found this site , anyone know if he is on diyAudio? And can any one tell me advantage of such a design.

http://www.shine7.com/audio/passive_pre.htm

21st January 2006, 02:24 AM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	you can buy a good rotator switch ( 12 steps ) then you put your own resistors in ( 12 resistors ) this makes lowest price you could put a -20dB switch beside the stepped attenuator so this will cover two different spans of volume ( 24 positions ) there are 24 positions switches to buy, but they cost a lot more values for a 100 kOhm potentiometer will depend if you want - linear characteristic - all resistors same value - logarithmic characteristic - values are progressive, from lower resistors to higher logarithmic is most often used in audio this will make you hear same loudness difference for each step for example -2.5 dB for each step __________________ lineup

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Stepped attenuator	sonokeling	Parts	0	11th July 2006 09:05 AM
100KOhm Ladder Attenuator with Various Amps	john65b	Class D	2	29th May 2006 06:37 AM
Stepped attenuator	Bas Horneman	Tubes / Valves	24	16th June 2004 07:18 AM
Stepped Attenuator	officeboy	Parts	3	6th May 2004 03:32 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

21st January 2006, 11:51 AM	#3
Wasted diyAudio Member Join Date: Dec 2005 Location: dublin	Thanks lLineup that sounds(Excuse pun) like a way to go if. If can't l learn Korean in the next few weeks then this is the way to go. By the way here is a link for calculating resistor values for attenuator Haven't tried it myself as I don't have one.

21st January 2006, 12:33 PM	#4
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	Here's one that I ordered.... 23 step Vishay with Dales in the kit. I think it's about $55 with the shipping. I don't think there is a better price. It was here within the week. I have not assembled it yet wut it looks great. This guy is also known as the seller "wanfai" on eBay.

21st January 2006, 06:53 PM	#5
Wasted diyAudio Member Join Date: Dec 2005 Location: dublin	Thanks Guys all very helpful, now whereto next?

21st January 2006, 07:03 PM	#6
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	... for a walk then to finish my Aleph.

22nd January 2006, 11:50 PM	#7
Wasted diyAudio Member Join Date: Dec 2005 Location: dublin	Just one last thing anyone got a good plan for a passive preamp using a 23 step attenuato, I kow I know I tend to get ahead of myself. Put it down to youthful exuberence(Ahem)!

23rd January 2006, 06:26 AM	#8
phaeden diyAudio Member Join Date: Aug 2005	Here is another site : http://www.diyfidelity.com.au/ I am using one as a passive - much better than a blue Alps and reasonably priced.

23rd January 2006, 08:31 PM	#9
Wasted diyAudio Member Join Date: Dec 2005 Location: dublin	thanks guys found this site , anyone know if he is on diyAudio? And can any one tell me advantage of such a design. http://www.shine7.com/audio/passive_pre.htm