Jfet IV with regulator pcb for sale

spencer · 9th June 2007, 02:36 PM

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.

spencer · 11th June 2007, 05:19 AM

Here is the circuit diagram again. One channel on pcb and price is $5 each board.

spencer · 20th June 2007, 02:50 PM

Still Available and here is the stuff notes and features.

spencer · 20th June 2007, 02:51 PM

Here is the update price list of some part available with the PCB.

spencer · 5th July 2007, 06:13 PM

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.

spencer · 5th July 2007, 06:26 PM

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.

spencer · 6th July 2007, 10:47 AM

The is completed version using J148/K982 as the regulator active device.

PCB and major Kit parts are still available for sales.

spencer · 6th July 2007, 10:51 AM

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!

spencer · 3rd October 2007, 08:02 AM

Update kit part list and price.

linhsichi · 20th November 2007, 08:15 AM

Hi , Spencer
This not about the I/V Stage PCB.
Before, You have been sale SM5847AF .
Do you have to continue sale it ?
Thanks!

----------------
linhsichi

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5th July 2007, 06:26 PM	#6
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	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.

6th July 2007, 10:51 AM	#8
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	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!

20th November 2007, 08:15 AM	#10
linhsichi diyAudio Member Join Date: Jul 2004 Location: Taiwan	Hi , Spencer This not about the I/V Stage PCB. Before, You have been sale SM5847AF . Do you have to continue sale it ? Thanks! ---------------- linhsichi

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