Jfet BOZ - Page 123

tinitus · 10th February 2013, 11:12 PM

thanks !

at first it had so much overdrive, and it distorted way too easy
now it does not sound distorted at all
it can still be pushed into overdrive, but only very very mild...and really sweet
but I still have a stereo unity gain buffer with attenuation between this and my big solid state 150watt hifi poweramp, or else it gets too much

but I'm very happy with the 'small stuff' I have learned from this
a break, and then on to the next project
cheers

Tyimo · 24th February 2013, 12:55 PM

Hi!
Is it possible to use this JBOZ as I/V converter for AD1865DAC?
If I remember well the gain of this amp: x16, +24dB?

Greets:
Tyimo

Hikari1 · 23rd May 2013, 05:10 AM

I am attempting to point to point a jfet boz.

I forgot to order the 475 ohm resistors on the output. Can a higher or lower value be used here? I have some 1K's and 910ohms I could parrallel up I guess for about 450 ohms.

Thanks.

vdi_nenna · 23rd May 2013, 05:20 AM

Quote:

Originally Posted by Hikari1

I am attempting to point to point a jfet boz.

I forgot to order the 475 ohm resistors on the output. Can a higher or lower value be used here? I have some 1K's and 910ohms I could parrallel up I guess for about 450 ohms.

Thanks.

Parallel a couple of 910s.

Hikari1 · 23rd May 2013, 06:10 AM

I'll give that a shot. Making progress so far.

mhouston · 23rd May 2013, 08:43 AM

Quote:

Originally Posted by Hikari1

I am attempting to point to point a jfet boz.

I forgot to order the 475 ohm resistors on the output. Can a higher or lower value be used here? I have some 1K's and 910ohms I could parrallel up I guess for about 450 ohms.

Thanks.

Mate just use 1k or anything close. The preamp probably loads into a minimum of a 10k load. 450ohms or 1k it really doesn't matter.

tinitus · 23rd May 2013, 08:52 AM

mine are 560ohm

Hikari1 · 23rd May 2013, 05:18 PM

Almost done. I doubled up two 1K's for the output.

I plan on using batteries like the diagram attached. Probably wont use any PS caps or maybe 1,000 UF or so.

Question: Should I just run the Pot/RCA grounds to the copper ground "buss" in the middle of the caps?

Zen Mod · 23rd May 2013, 05:47 PM

use anything between 22R and 1K

it's there as idiotproof level increasing part

merlin2069er · 23rd May 2013, 06:04 PM

wow, those are big caps.

23rd May 2013, 05:47 PM	#1229
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	use anything between 22R and 1K it's there as idiotproof level increasing part __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

23rd May 2013, 06:04 PM	#1230
merlin2069er diyAudio Member Join Date: Sep 2008 Location: Toronto	wow, those are big caps. __________________ F5 / B1 / dcb1 / AK4396 Dac / Monica Dac / ezDac / Dynaco ST 35 / jFet BOZ / Lightspeed attenuator

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10th February 2013, 11:12 PM	#1221
tinitus diyAudio Moderator Join Date: Nov 2005	thanks ! at first it had so much overdrive, and it distorted way too easy now it does not sound distorted at all it can still be pushed into overdrive, but only very very mild...and really sweet but I still have a stereo unity gain buffer with attenuation between this and my big solid state 150watt hifi poweramp, or else it gets too much but I'm very happy with the 'small stuff' I have learned from this a break, and then on to the next project cheers

24th February 2013, 12:55 PM	#1222
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Hi! Is it possible to use this JBOZ as I/V converter for AD1865DAC? If I remember well the gain of this amp: x16, +24dB? Greets: Tyimo

23rd May 2013, 08:52 AM	#1227
tinitus diyAudio Moderator Join Date: Nov 2005	mine are 560ohm