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  1. w62820616

    Question about Eagle CAD PCB layout

    Hello,          I am having trouble to set up an restriction area for OPAMP. I don't want the ground plane to cover the OPAMP socket. Should I use restrict or keepout layer ?   Best Kee
  2. w62820616

    Brush noise from the pot.

    I noticed that my alps RK097 pot has a noise problem when I turn the shaft really fast. It only happen to the right channel ( where the metal shaft directly connected to). you need a low impedance ear phone to hear the problem (i am using UE ). But if you turn the pot really slow, you will not...
  3. w62820616

    Question about transformer without center tap.

    Hello everyone,                        I found a transformer on digikey which is 10VA, 2X110V primary 2X12V secondary. The schematic is attached below:                   My question is, can I simply combine the two terminals of the output to make a ground?                    Like this...
  4. w62820616

    Couple questions about my pocket amp design

    Hello Everyone,                          I am trying to make a pocket amp and I am having troubles with Virtual ground circuit design. The Sch is shown below:                                                                      I have a tle2426 to get the middle voltage from 2 9...
  5. w62820616

    A have a question about a transistor

    1 .Can we use this Ic (transistor?) to bulid an Amplifier? If yes , how can we use it ? 2.Some one told me that only pair-transistor (such as B647/D667) can be used for amplifier, is that ture? thanks alot