With the employ of current mirror buffer, the peak current per channel can be around 200ma (15ohm load)   Use 1% dale resistor , the channel difference is less than 2%   The band with is around 1.1MHZ   Starting Freq. 1KHz Amplitude 1.0V pp End cut off Freq 1.1MHz. -3 dB...

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

I can't really tell the difference in color :( Or I am so used to multimeters :P

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...

Or they will drain each other ? If it does, is there any way to save that issue ?

Finally, after 3 weeks, I got the boards.   pretty nice sound !  

  Can't really hear the difference. It will lower the volume around 50%. Homemade PCB, fly wires, hmmmmmmmmmmm..........

Hello everyone, I've found some PNP Ge transistors and want to build an audio amplifier from it. I used to work with NPN a lot and I know the way to bias them is to use a two resistor voltage divider. However, because the PN junction in PNP is reversed, the resistor divider dose not work...

Hello everyone,                           I keep seeing "Linear" with many earphone amplifiers. What does linear mean?   Best Lee

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...

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...

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