B1 builders thread - Page 53

KatieandDad · 2nd February 2012, 02:50 PM

OK found it. I'm now posting in right thread.

I will have a complete B1 available for anyone that would like to try it.

It's BRILLIANT - It's just my DIY bug that won't let go. It won't have the Oblligatos fitted, it will be back to 2 x 4.7uF Polyprop drops as it started life.

This is a DIY board but is fully functional and has been thoroughly tested.

Salas · 2nd February 2012, 02:58 PM

Post that in swap meet, not in regular threads.

sachu888 · 24th May 2012, 09:06 AM

Here is my B1 with LDR volume control and DIY regulated power supply:

By sachu888 at 2011-12-24

By sachu888 at 2012-03-03

By sachu888 at 2012-03-02
I am very happy with the sound.Thanks Mr. Pass for sharing great designs to DIY community.I have one problem with this setup Bass is sounding very thin with LDR volume control.Can anybody comment on this?Can buypassing LDR or replacing it with 47k stereo Pot will solve this issue?

Regards,
Sachin

OlavHaal · 26th May 2012, 08:40 AM

On my B1 - which have very firm bass and good sound - I used a variant of this - that I found on the ebay. There are many versions and prices if you look closely! I think your cat5 single wire is much too thin in this amplifier.
Valab 16 AWG (19 x 0.32mm) Teflon Silver Plated Copper Wire

Best

Olav

AndrewT · 26th May 2012, 10:42 AM

What is the difference in resistance of a Cat5 pair to your Valab pair at 1m and 10m interconnect lengths?
What proportion of the total circuit resistance is made up by the cable resistance change?
Do the differences in impedance of the cables account for some of the sound difference?

6Feet · 26th May 2012, 02:34 PM

Î see that you put the gate and source to ground. In the article of Mr. Pass, he says to put the gate and drain to ground. I am confused....

AndrewT · 26th May 2012, 02:39 PM

6,
post the reference.

gate and source connected creates a CCS
gate and drain connected creates a test topology.

6Feet · 27th May 2012, 01:22 AM

The reference is from the b1 preamp pdf you can download at http://www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf. On the page referenced as SIDE C, the second last paragraph, it states the following: <<Q101 and Q201 are constant current sources formed by simply attaching the Gate pins of the JFETs to the Drain pins. They provide without loading
them down or creating significant distortion.>>. This is why I am asking the question.

sachu888 · 27th May 2012, 03:26 AM

Quote:

Originally Posted by 6Feet

Î see that you put the gate and source to ground. In the article of Mr. Pass, he says to put the gate and drain to ground. I am confused....

Sorry6,but I did not understand your query.

Regards,
Sachin

6Feet · 27th May 2012, 09:39 AM

I just want to know what is the correct way to wire up the transistor. I see that you wired the transistor a certain way and Mr. Pass another to make a current source. Maybe its a typo in the article but which one is correct?

26th May 2012, 10:42 AM	#525
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	What is the difference in resistance of a Cat5 pair to your Valab pair at 1m and 10m interconnect lengths? What proportion of the total circuit resistance is made up by the cable resistance change? Do the differences in impedance of the cables account for some of the sound difference? __________________ regards Andrew T.

26th May 2012, 02:39 PM	#527
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	6, post the reference. gate and source connected creates a CCS gate and drain connected creates a test topology. __________________ regards Andrew T.

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2nd February 2012, 02:50 PM	#521
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	OK found it. I'm now posting in right thread. I will have a complete B1 available for anyone that would like to try it. It's BRILLIANT - It's just my DIY bug that won't let go. It won't have the Oblligatos fitted, it will be back to 2 x 4.7uF Polyprop drops as it started life. This is a DIY board but is fully functional and has been thoroughly tested.

2nd February 2012, 02:58 PM	#522
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Post that in swap meet, not in regular threads.

24th May 2012, 09:06 AM	#523
sachu888 diyAudio Member Join Date: Jul 2010 Location: Nashik	Here is my B1 with LDR volume control and DIY regulated power supply: By sachu888 at 2011-12-24 By sachu888 at 2012-03-03 By sachu888 at 2012-03-02 I am very happy with the sound.Thanks Mr. Pass for sharing great designs to DIY community.I have one problem with this setup Bass is sounding very thin with LDR volume control.Can anybody comment on this?Can buypassing LDR or replacing it with 47k stereo Pot will solve this issue? Regards, Sachin

26th May 2012, 02:34 PM	#526
6Feet diyAudio Member Join Date: Nov 2011	Î see that you put the gate and source to ground. In the article of Mr. Pass, he says to put the gate and drain to ground. I am confused....

27th May 2012, 01:22 AM	#528
6Feet diyAudio Member Join Date: Nov 2011	The reference is from the b1 preamp pdf you can download at http://www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf. On the page referenced as SIDE C, the second last paragraph, it states the following: <<Q101 and Q201 are constant current sources formed by simply attaching the Gate pins of the JFETs to the Drain pins. They provide without loading them down or creating significant distortion.>>. This is why I am asking the question.

27th May 2012, 09:39 AM	#530
6Feet diyAudio Member Join Date: Nov 2011	I just want to know what is the correct way to wire up the transistor. I see that you wired the transistor a certain way and Mr. Pass another to make a current source. Maybe its a typo in the article but which one is correct?

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