Acquire that from eBay but the analogy output two channels is not working! Quick check on the power supply capacitors found that the one near the DACs is not connected to +Vcc. After trace through the path, it goes to the inductor L3. Checked one plated through hole is OPEN near C83 (as seen dented at the bottom). After discussion with the seller, I want to repair it myself and he agreed. So putting a jumper wire as shown, the card is working again. Another bonus is that the Seller refunded me US$25 and thus I am buying this card at 20% discount!
June 24, 2021
Shure Condenser Mic Repair
The problem is noisy and sometime signal weak. Open up (screw from bottom) the mic see nothing wrong with parts but after some searching around, found one yellow wire was broken, then the next one wire. As you can see the wire strand all oxidized and become poor connection! This is probably mic is not used in Studio environment and humidity weather cause the problem after 10 years use!
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March 20, 2021
Sales update 2023 Jan
A. MOSFET: Toshiba 2SK1530-Y/2SJ201-Y pairs :
N-P 1 pair, no match SGD$33; NN-PP 2 pairs, match NN and PP only SGD$70; NNN-PPP 3 pairs, match NNN and PPP only SGD$108; NNNN-PPPP 4 pairs, match NNNN and PPPP only SGD$145. Note no N to P match.
B. TOSHIBA K170/J74 Jfets: All match within 0.2mA Idss at Vds 10V :
Toshiba K170BL – only 6.5mA to 9mA (SGD$20 for 4 pcs match), other values SGD$8 each.
Toshiba J74BL – 10mA and above (SGD$20 each pc, SGD$40 per pair match, SGD$80 per quad match). No Idss below 10mA! Can ask to see if still have!
Toshiba K170BL / J74BL pair SGD$28 one pair NP; SGD$56 for 2 pairs NNPP; and SGD$112 for 4 pairs NNNNPPPP (Idss 10mA to 11+mA). SOLD OUT!
a)2SK369BL – higher gain low noise jfet similar to K170BL; b) 2SK363BL / 2SK373BL: Good for current sources; c) K389/J109 – limited stock with short leads
C. Shipping cost : SGD$11.9 below 250g, $21.10 below 500g (revised 2023) by registered airmail from Singapore.
D. Continue to sell WM8804 to CS8412 converter board. Price is SGD$65 using crystal SGD$70 using TXC XO (new Version 2) with shipping and paypal fee.
Details link: http://www.fetaudio.com/archives/1602
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February 16, 2021
Re-Life to D1 PCM63 DAC
With the work of 1 year away from home, I am back to Singapore and thus able to be with my old hobbies – DIY audio. During this time, I was approached by a DIYer about the modification of the D1V2 (http://www.fetaudio.com/archives/23) board to use USB input for network audio. After some discussion, the DIYer is able to make it work and here I share the details of the modifications of the USB to PCM63 DAC with permission. I keep all the original text of the modifications and only added few comments in the text.
Picture of the Modifications:
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July 23, 2017
hp 5334A Frequency Counter 100MHz
Pick up this in junk yard for a low price and found inside all corrosive due to battery leakage! After I do a cleaning and washing on the main PCB and replace all 6 pcs 100uF 15V cap with new Panasonic FC capacitors, the set can work as it is. Gone through performance check and all ok, self diagnostic also all OK, frequency can measure up to 105 MHz and level down to 35mVpp which is a bit better than spec. Date code of part is mostly at year 1986, this this is a 30 years old hp equipment and is still working fine! Made in USA.
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