Sales update

January 22nd, 2017

22 Jan 2017

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Toshiba Mosfet 2SK1530-Y/2sJ201-Y pairs for sales: (Available NOW)

NNN-PPP 3 pairs, match NNN and PPP only: HK$600.  AVAILABLE

NNNN-PPPP 4 pairs, match NNNN and PPPP only: HK$800. AVAILABLE

Note that there is no NP match for above prices but those order early may have Limited stock.

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Jfets:

Toshiba K170BL – only 6.5mA to 9mA (HK$100 for 4 pcs)

Toshiba J74BL – 6.4 to 10mA (HK$110 each pc); >10 to 11.2mA (HKD$75 each pc)

Toshiba K170 / J74 pair HK$150 each pair (6.8 to 10mA).  Limited stock!

Note all jfets can be matched to maximum 4 pcs in one group of same channel type.  Example NNNN, PPPP, NNPP, and NNNNPPPP.  All within 0.2mA Idss tolerance.

Thank you for all the support!  Any query, please ask.

NI PXIe-8370, PCIe-8371, PXI-GPIB upgrade

November 26th, 2016

I was using NI PXIe-8105 embedded controller in my NI PXIe-1062Q chassis but the speed is too slow.  Recently I have acquired the controller card PXIe-8370 (about 800MB/s; pcie x 4).  The PCIe-8371 card can be put  in my computer PCIe x 16 slot (for VGA card) and function perfectly. Mother Board is Gigabyte H77N ITX version. OS is WIN7 64bit version and both the NI and audio precision system two cascade is working fine with an I5-3570K CPU.  The fan noise of the NI chassis is even lower then before and the power loading is lesser without the embedded controller!

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Without the embedded controller, I lost some I/O like parallel port, GPIB etc… and thus I have to get one more PXI-GPIB card.  Later I find out my Agilent 82357B USB – GPIB controller is also working fine in with NI system.  In the past, I plug the USB into PXIe-8105 but cannot make it work properly!  Thus the PXI-GPIB card become excess!

Key sight DSO-X 3024T firmware update

November 25th, 2016

Keysight has released new firmware 04.08 for DSO-X 3024T and here are the photos of upgrade process.  The whole process take about 5-6 mins.

It has made lots of changes in this version and details refer to website link:

http://www.keysight.com/main/software.jspx?ckey=2573488&lc=eng&cc=SG&nid=-32541.1150350&id=2573488

Audio Precision USB APIB Adapter (inside photos)

November 19th, 2016

I am using PCMCIA to APIB to control my AP system two cascade under winxp.  The PC is celeron with PCMCIA slot and thus is running very slow.  One way is to use a PCI to PCMCIA adapter if PC is to be upgraded.  I just have one i5  – 3570K with 8GB ram and ITX Mother Board and thus no PCI slot!

Recently I saw a old AP USB to APIB adapter on ebay for about US$350 and thus I think it is time to upgrade the speed of the AP system. 

Here is some photos inside the adapter.

USB interface – Cypress CY7C68014A-128AXC

74ATC240 / 74ACT245

4420P-G01 / 4816P 

See photos for details.

Ekras distribution amplifier inside photo

November 6th, 2016

This is Korean distribution power amp and record some photos before throw away.