Phono for Bride of Zen - Page 2

Ila · 28th July 2005, 10:44 AM

Thank you for your nice post. As I mentioned before, the phono stage is a project not a ready cooked meal for microwave use (although it functions well).
The measured parameters like distortion, noise, equalisation accuracy are beyond criticism.

I have tried out several MM-cartridges like Linn Adikt or some Ortofon. What you get is a warm and rhythmic sound with a well defined and deep bass performance. The focus of voices or instruments is perfect. What I personally dislike is that voices seem to be attenuated a bit.

This gets better if you cascode the bipolar transistor. For some unknown reason you lose a bit of the rhythmic character.

Ivo Linnenberg

steenoe · 29th July 2005, 03:41 PM

Ivo, any chance you could post a pdf to scale of the copper side?
In black and white. I will give your layout a shot

I just need the coppertracks in B/W to etch a few boards

Dont give up, things dont go that fast

Steen

Ila · 29th July 2005, 06:45 PM

Hi Steen,

here is the copper side (1:1) of our little test pcb. The pcb measures 100x100mm.

There is no protective shielding layer (single sided pcb); so please use a metal cabinet connected to circuit ground.

Ivo Linnenberg

steenoe · 29th July 2005, 06:53 PM

Thank you very much, Ivo

Steen

BTW, very nice little board

steenoe · 18th November 2005, 07:11 PM

Hi Ivo. Just finished the board, it will be put in the same chassis as the BoZ I am working on. How do you adjust the trimpots; what do you measure where?

The smaller board is a regulated "Zen-style" psu for the riaa, it will just tap the BoZ's 60v supply and gives a steady 24v. Hope it will be quiet enough

Here is a pic, just in case you care to see

Steen

apassgear · 18th November 2005, 10:15 PM

Quote:

Originally posted by steenoe
Hi Ivo. Just finished the board, it will be put in the same chassis as the BoZ I am working on. How do you adjust the trimpots; what do you measure where? The smaller board is a regulated "Zen-style" psu for the riaa, it will just tap the BoZ's 60v supply and gives a steady 24v. Hope it will be quiet enough
Here is a pic, just in case you care to see

Steen

Beautiful work Steen. You have more projects on the works than anybody I can remember. Are you also working on the KSA50?

steenoe · 19th November 2005, 06:55 AM

Yes, Tony I tend to start up a lot of projects. Everytime I see something exciting; I want to build it

Somehow I do manage to finish them all, though

Not necesarily at the deadline

After I finish the F2 and the BoZ with Riaa, I really have to finish my A-X monoblocks and a X-CCS-BosoZ. The NS10 will be a little job in between. After that I am planning on a pair of Aleph 5, monoblocks (but they might turn into a J-fet version if, someone manage to offer some of those power J-fets for sale!). The KSA50 will have to wait a bit. Its not nearly as appealing as Mr. Pass's creations

While all that is going on, I enjoy my BosoZ with the Pearl, and my ZenV4

This is indeed a great hobby

Steen

Ila · 20th November 2005, 01:27 PM

Hi !

The small trimmer is used to adjust the operating point. First step is to trim the output voltage to roughly 12V. (measured over the 560 ohm resistor R112/212) After some time fine trim the circuit, so that the voltage over the 12kohm resistor R115/215 is nearly zero. You will see some temperatue drift and the adjustment is somewhat supply voltage dependent.

steenoe · 20th November 2005, 01:37 PM

Quote:

Adjustment

Thanks a lot, Ivo. I will get right to it

Hope to have a listen today. Will keep you posted.

Steen

steenoe · 24th November 2005, 12:43 PM

I am having a little trouble, getting this up and running. When connecting the preamp, the speakers sounds excactly like a pulse(heartbeat

) the sound follows the volume, and the music follows the pulse! The woofers looks like a beating heart! What can I have done wrong or what can cause this? I also noticed that the supply voltage drops about 5-6 volts, when connected to the RIAA. I just connected another supply, but that didn't help. The only difference from the schematic is that the trimpot is only 200r instead of 250r.
I also tried with 500r, with the same result. Otherwise everything is as per schematic. Also, I cant get a steady reading across r112/r212 and r115/r215. The digits keeps drifting.
Any suggestions?

Steen.

20th November 2005, 01:27 PM	#18
Ila diyAudio Member Join Date: Oct 2004	Adjustment Hi ! The small trimmer is used to adjust the operating point. First step is to trim the output voltage to roughly 12V. (measured over the 560 ohm resistor R112/212) After some time fine trim the circuit, so that the voltage over the 12kohm resistor R115/215 is nearly zero. You will see some temperatue drift and the adjustment is somewhat supply voltage dependent.

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28th July 2005, 10:44 AM	#11
Ila diyAudio Member Join Date: Oct 2004	Thank you for your nice post. As I mentioned before, the phono stage is a project not a ready cooked meal for microwave use (although it functions well). The measured parameters like distortion, noise, equalisation accuracy are beyond criticism. I have tried out several MM-cartridges like Linn Adikt or some Ortofon. What you get is a warm and rhythmic sound with a well defined and deep bass performance. The focus of voices or instruments is perfect. What I personally dislike is that voices seem to be attenuated a bit. This gets better if you cascode the bipolar transistor. For some unknown reason you lose a bit of the rhythmic character. Ivo Linnenberg

29th July 2005, 03:41 PM	#12
steenoe diyAudio Member Join Date: Mar 2004	Ivo, any chance you could post a pdf to scale of the copper side? In black and white. I will give your layout a shot I just need the coppertracks in B/W to etch a few boards Dont give up, things dont go that fast Steen

29th July 2005, 06:53 PM	#14
steenoe diyAudio Member Join Date: Mar 2004	Thank you very much, Ivo Steen BTW, very nice little board

19th November 2005, 06:55 AM	#17
steenoe diyAudio Member Join Date: Mar 2004	Yes, Tony I tend to start up a lot of projects. Everytime I see something exciting; I want to build it Somehow I do manage to finish them all, though Not necesarily at the deadline After I finish the F2 and the BoZ with Riaa, I really have to finish my A-X monoblocks and a X-CCS-BosoZ. The NS10 will be a little job in between. After that I am planning on a pair of Aleph 5, monoblocks (but they might turn into a J-fet version if, someone manage to offer some of those power J-fets for sale!). The KSA50 will have to wait a bit. Its not nearly as appealing as Mr. Pass's creations While all that is going on, I enjoy my BosoZ with the Pearl, and my ZenV4 This is indeed a great hobby Steen

24th November 2005, 12:43 PM	#20
steenoe diyAudio Member Join Date: Mar 2004	I am having a little trouble, getting this up and running. When connecting the preamp, the speakers sounds excactly like a pulse(heartbeat ) the sound follows the volume, and the music follows the pulse! The woofers looks like a beating heart! What can I have done wrong or what can cause this? I also noticed that the supply voltage drops about 5-6 volts, when connected to the RIAA. I just connected another supply, but that didn't help. The only difference from the schematic is that the trimpot is only 200r instead of 250r. I also tried with 500r, with the same result. Otherwise everything is as per schematic. Also, I cant get a steady reading across r112/r212 and r115/r215. The digits keeps drifting. Any suggestions? Steen.