Jfet BOZ point to point help

Hikari1 · 10:14 PM

I am trying to wire up a Jfet BOZ point to point w/a SMPS or battery PS.

Does this look like a good way to do it? Do I need the PS caps?

Thanks!

merlin2069er · 15th May 2013, 10:17 PM

That looks ok. I used 2x 9v batteries.

https://sites.google.com/site/merlin...leted/jfet-boz

Loudthud · 15th May 2013, 10:34 PM

It would be wise to insert some resistance between the PS + terminal and the caps on each channel. Perhaps 100 ohms at 1W. The caps should be close to the circuitry for each channel. Some SMPS don't like big capacitors (>1000uF) on the output. They become unstable.

Hikari1 · 15th May 2013, 10:51 PM

Merlin:

I noticed in your sig you have a B1 and a Jfet boz.

I just finished an F5 and I am finding it responds better to hot sources (like CD) and doesn't like my vinyl setup. I am using a passive pre with a 25K pot. CD sounds better than vinyl w/the F5...which pisses me off.

Vinyl sounds better through the MC section of a phono amp (I have a HOMC cart) confirming my suspicion than the F5 likes high input voltage/gain.

Thus I want to build a Jfet boz.

What's your experience been?

Hikari1 · Today, 05:12 AM

I forgot to order the 475 ohm resistor on the output...damn.

Can a different value be used here?

15th May 2013, 10:17 PM	#2
merlin2069er diyAudio Member Join Date: Sep 2008 Location: Toronto	That looks ok. I used 2x 9v batteries. https://sites.google.com/site/merlin...leted/jfet-boz __________________ F5 / B1 / dcb1 / AK4396 Dac / Monica Dac / ezDac / Dynaco ST 35 / jFet BOZ / Lightspeed attenuator

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15th May 2013, 10:34 PM	#3
Loudthud diyAudio Member Join Date: Nov 2007 Location: Near Dallas Texas USA	It would be wise to insert some resistance between the PS + terminal and the caps on each channel. Perhaps 100 ohms at 1W. The caps should be close to the circuitry for each channel. Some SMPS don't like big capacitors (>1000uF) on the output. They become unstable.

15th May 2013, 10:51 PM	#4
Hikari1 diyAudio Member Join Date: Jun 2012 Location: Seattle	Merlin: I noticed in your sig you have a B1 and a Jfet boz. I just finished an F5 and I am finding it responds better to hot sources (like CD) and doesn't like my vinyl setup. I am using a passive pre with a 25K pot. CD sounds better than vinyl w/the F5...which pisses me off. Vinyl sounds better through the MC section of a phono amp (I have a HOMC cart) confirming my suspicion than the F5 likes high input voltage/gain. Thus I want to build a Jfet boz. What's your experience been?

Today, 05:12 AM	#5
Hikari1 diyAudio Member Join Date: Jun 2012 Location: Seattle	I forgot to order the 475 ohm resistor on the output...damn. Can a different value be used here?