| spencer |
This post was lost!
I have some silver mica 2700pf for use to replace C1 and C2 in the Jfet IV board. Interested can write to me. |
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| spencer |
| Here is the circuit diagram again. One channel on pcb and price is $5 each board. |
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| spencer |
| Still Available and here is the stuff notes and features. |
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| spencer |
| Here is the update price list of some part available with the PCB. |
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| spencer |
| Note that there is an error of the Q4 K982 orientation. The correct way is to turn the fet 180 degree and solder onto the board as shown in the photo. |
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| spencer |
Sorry to spot this error so late as I used the IRF610 as the negative regulator active device.
If any user has lost the K982, I can send replacement for free. Just contact me. Thanks. |
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| spencer |
The is completed version using J148/K982 as the regulator active device.
PCB and major Kit parts are still available for sales. |
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| spencer |
Note that the transformer for this Jfet IV should be 24V x 2 and the DC input to the regulator should be >= +/-31V dc.
Enjoy the sound! |
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| spencer |
| Update kit part list and price. |
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| linhsichi |
Hi , Spencer
This not about the I/V Stage PCB.
Before, You have been sale SM5847AF .
Do you have to continue sale it ?
Thanks!
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linhsichi |
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| spencer |
| Hi, no more SM5847 IC, only left the converter board. |
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| wlhuang |
| Are there any PCB and major kit parts for sales? |
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| moemoe |
After working on the jfet stage on and off for two weeks, it is finally completed and integrated within my DAC.
I used 2 x matched 2SK170BL as provided by Spencer for each i/v board. I set the current source at the bottom at 4mA, the higher side of the recommended range of 2mA - 4mA. I didn't experiment 2 vs 1 2sk170 for the input device as I don't have the spare time to try out the different options for the input device but, to my ears, 2 x sk170 already sounds pretty good. I bet it will be even better once the boards are fully burned-in.
Thanks Spencer for your advice you had provided when I was doing the mod project!
Moe |
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| MALZA |
Hi spencer
Your IV stage is unbalenced
Have you one IV stage Balenced?
Thx
Matthias |
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| xaudiox |
| quote: | Originally posted by MALZA
Hi spencer
Your IV stage is unbalenced
Have you one IV stage Balenced?
Thx
Matthias |
i think for balanced, just used 2 per channel..
:) |
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| MALZA |
Yes I think you have rigth ;) ;)
But in the box with your solution I have 4 PCB.
MY box is little and if is possible to have 2 PCB I take this solution
If is not possible I take 4 pcb and I re make a box :) :)
Sorry for my poor english
Thx
Matthias |
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| spencer |
Matthias,
If you need any assistance, please email me at
skcheung68 AT hotmail com.
Spencer |
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