Hmm... Could I use a 1K pot in the shunt hookup before a unity gain buffer? I know 1K is a little low, but I have a few 1K pots of very high quality lying around (I also had 2 20Ks, but used those for my passive preamp) and was wondering if I could use them for the volume adjustment for my active xover.
Hello,
I built my own and it kicks. I gave up on this design long ago. But I regret that now. So much waste of time/money trying really hard to find rotary switches.
I did some calculations on my own. And compared them to the data shown at GoldPoint website.
http://www.people.cornell.edu/pages/ti20/ReportShunt.doc
It's in Word, I hope you guys don't have agenda with MS.
For me, my amp is really high gain. ... 11. So I had to increase the shunt resistor bigger than 10K. I am using 100K now.
I am supposed to be hearing distortion at high freq according to GoldPoint, but I am hearing none. ...
Oh yeah, this design works far better with low resistance pot, right? I get really nice curb with 10K shunt by 10K pot. I wish I had 10K pot, ... mine is Nobel 50K.
Tomo
I built my own and it kicks. I gave up on this design long ago. But I regret that now. So much waste of time/money trying really hard to find rotary switches.
I did some calculations on my own. And compared them to the data shown at GoldPoint website.
http://www.people.cornell.edu/pages/ti20/ReportShunt.doc
It's in Word, I hope you guys don't have agenda with MS.
For me, my amp is really high gain. ... 11. So I had to increase the shunt resistor bigger than 10K. I am using 100K now.
I am supposed to be hearing distortion at high freq according to GoldPoint, but I am hearing none. ...
Oh yeah, this design works far better with low resistance pot, right? I get really nice curb with 10K shunt by 10K pot. I wish I had 10K pot, ... mine is Nobel 50K.
Tomo
Hallo Mr. HarryHaller,
I'v send you an e-mail before asking if you could tell us where you bought the white cable in your Preamp.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2608&perpage=15&highlight=passive&pagenumber=3
I also asked if it is possible to explain or to show us the schematic of you battery bias preamp.
I hope you'll be able to see this thread. And I hope to hear something regarding this preamp schematic and white cable.
Ones again thanks for your help.
Audiofanatic
I'v send you an e-mail before asking if you could tell us where you bought the white cable in your Preamp.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2608&perpage=15&highlight=passive&pagenumber=3
I also asked if it is possible to explain or to show us the schematic of you battery bias preamp.
I hope you'll be able to see this thread. And I hope to hear something regarding this preamp schematic and white cable.
Ones again thanks for your help.
Audiofanatic
Mr. Harry Haller is currently Sinbinned and he'll be out in a few weeks.
I have no idea what cable it is.
I have no idea what cable it is.
What happend to the battery not-so-passive preamp design?
The battery part could be a nice feature... A passive pre with blue leds
The battery part could be a nice feature... A passive pre with blue leds
Hi,
I've just finished my Passive Preamp. It uses a dual ganged Alps pot and input select rotary switch. It uses bare wires through out etc etc.
I'll try to post some pics tonight...It sounds fantastic!
Thanks everyone!!!
Gaz
I've just finished my Passive Preamp. It uses a dual ganged Alps pot and input select rotary switch. It uses bare wires through out etc etc.
I'll try to post some pics tonight...It sounds fantastic!
Thanks everyone!!!
Gaz
I have just finished mine too!
I used a Dact 20K attenuator, and wanted to go one
further, and add a buffer.
As I did not have a BUF03, but a pair of EL2001 lying around, I used these. Sounds great!
But they give off a few mV DC....
Maybe I have to add caps? (Was not the intention!).
Arne K
NORWAY
I used a Dact 20K attenuator, and wanted to go one
further, and add a buffer.
As I did not have a BUF03, but a pair of EL2001 lying around, I used these. Sounds great!
But they give off a few mV DC....
Maybe I have to add caps? (Was not the intention!).
Arne K
NORWAY
Final one. Here are the guts. An Alps 100k dual gang pot and rotary switch. The resistors are 1% metal films. The wires are...wait for it...home made:
I got IDE flat cables and took off one wire from the ribbon. I took off the insulation and seperated it into its 7 seperate wires. I then braided three at a time. Don't know why - but it sure as hell impressed my friends! 😉
I got IDE flat cables and took off one wire from the ribbon. I took off the insulation and seperated it into its 7 seperate wires. I then braided three at a time. Don't know why - but it sure as hell impressed my friends! 😉
Attachments
Thanks Audiofanatic. It does sound amazing - mind you - anything would have sounded better than my old integrated amp with the amp stages bypassed! 
Gaz
Edit:
Just gramatical! 😉
Gaz
Edit:
Just gramatical! 😉
Hi,
Looks very nice (and complicated!). I have to admit that I can't quite identify all the parts...but it does look impressive!
Gaz
Looks very nice (and complicated!). I have to admit that I can't quite identify all the parts...but it does look impressive!
Gaz
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