TDA1541/SAA7220 replacement board - Page 2

steve jones · 17th July 2002, 06:24 PM

Jocko hand built the I/V board to my requirements. 3V out with DC servo. He was willing to build to any reasonable output voltage and offered DC servo, cap coupled or DC trimmed outputs.

He smoke tests and fully measures the board.

Mine tests with a Zin=0.1 ohm per channel. This is for connection from the PCM1704s' Iout. If lower load impedance for the DACs' Iout equals better sonics, this will be damn hard to beat.

Vout=2.93VRMS with JFET output.

THD<85dB 2nd harmonic with a "trace of 3rd". "All without no stinkin' feedback" -Jocko.

Supply requirements: +/-22-18VDC@95mA.

I will be awhile until I get it up and running, but I just had to comment on the products that Jocko is selling. The PCB is of the same quality as the older US manufactured Hewlett Packard inkjet boards that we build in house (the best I've ever seen). The I/V board surprised the hell out of me. I couldn't buy half the parts retail for what he charged me, and the measured performance is beyond what I could conceive of in 10 years of trial and error.

And Jocko sez it will sound better than I expect!

PAM · 25th September 2002, 07:17 PM

Dear Yoko,

I own a Marantz CD 80. I modified it to Pooge 5 level from AA.
Is your board better ?
What does your replacement board costs ?
And what for the I/V board

peufeu · 20th December 2003, 12:53 PM

Hi Jocko !

I'd like to try the PCM1704... can you tell me how it sounds (you seem to like it) compared to AD1865 for instance ? I havent' heard TDA1541A so can't comment on your relationship with it, but I like the AD chip... Shame it won't do 24 bits though.

Also do you use slow or sharp rolloff in the dig filter ?

Thanks !

17th July 2002, 06:24 PM	#11
steve jones diyAudio Member Join Date: Mar 2002 Location: Vancouver USA	Now for a little more info on the I/V board..... Jocko hand built the I/V board to my requirements. 3V out with DC servo. He was willing to build to any reasonable output voltage and offered DC servo, cap coupled or DC trimmed outputs. He smoke tests and fully measures the board. Mine tests with a Zin=0.1 ohm per channel. This is for connection from the PCM1704s' Iout. If lower load impedance for the DACs' Iout equals better sonics, this will be damn hard to beat. Vout=2.93VRMS with JFET output. THD<85dB 2nd harmonic with a "trace of 3rd". "All without no stinkin' feedback" -Jocko. Supply requirements: +/-22-18VDC@95mA. I will be awhile until I get it up and running, but I just had to comment on the products that Jocko is selling. The PCB is of the same quality as the older US manufactured Hewlett Packard inkjet boards that we build in house (the best I've ever seen). The I/V board surprised the hell out of me. I couldn't buy half the parts retail for what he charged me, and the measured performance is beyond what I could conceive of in 10 years of trial and error. And Jocko sez it will sound better than I expect!

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25th September 2002, 07:17 PM	#12
PAM diyAudio Member Join Date: May 2002	Dear Yoko, I own a Marantz CD 80. I modified it to Pooge 5 level from AA. Is your board better ? What does your replacement board costs ? And what for the I/V board

20th December 2003, 12:53 PM	#13
peufeu diyAudio Member Join Date: Mar 2001 Location: Lyon, France	Hi Jocko ! I'd like to try the PCM1704... can you tell me how it sounds (you seem to like it) compared to AD1865 for instance ? I havent' heard TDA1541A so can't comment on your relationship with it, but I like the AD chip... Shame it won't do 24 bits though. Also do you use slow or sharp rolloff in the dig filter ? Thanks !