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30th March 2005, 07:48 AM
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diyAudio Member
Join Date: Apr 2004
Location: Hanoi
  
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Seeking advice on implementing opa627 I/V stage
Hi
I plan to use opa627 in the I/V stage (including 1st order LPF) for my DAC (AD1865 NOS). Can I have your recommendations on the following? Value of feedback resistor? Power supply capacitors and bypassing capacitors. How many uF is most suitable (I donft like too big caps which seem to sound agressive). By passing cap: BB recommend ceramic caps which I found strange. Normally people use only 0.1uF. Can I use larger value film caps e.g. 1uF? Is +/-15V PS good for this application? I donft want more than one opamp per channel so first order LPF if preferred. This worked OK with NOS TDA1541A (using opa2134, sounds really good). I guess this will be OK with AD1865 too. Thanks Quan |
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