Posts by wakibaki

The CMoy circuit will work, with the provisos I made about layout and heatsinking, but adding short circuit protection will degrade the amplifier performance or add a lot to the complexity of the circuit.   If you can trust...

Don't do it that way.   Either use the volume control on the amplifier or whatever source you are using, or put a resistor divider (not just a single resistor) or a pot (variable resistor) between the source and the amplifier....

I don't think much of virtual ground circuits, but I drew this:-     As drawn it draws just 1.4mA, has an output offset of 6 nanovolts, and an output impedance of ~0.1 ohms. Build it with the LT1097 shown for the...

  As shown simulated including worst case LT1097 input offset -   1.4mA total current   6 nanovolts output error   0R1 ballasts   With cheap LM2904 and 1R buffers, 50mV error,...

Quote: Originally Posted by proid  That is the output resistor like in the cmoy as i know.    What does it do?

Some people thought up the idea of a ground channel.   They built amplifiers with it. They did measurements they thought showed it was better. They sold the idea to a lot of people, even though some other experts thought their...

If you want a hybrid headphone amp, then the Millett 'Starving Student' is highly regarded. In fact it's so outstanding there isn't really anything else in the same league. The problem is, you can't get the tubes, and if you want to go...

What's the 30R1 doing between C2 and the output jack? If you take a look at the Millett design that this is modelled on, it doesn't have this resistor, which AFAICS just increases the output impedance and wastes power. Unless somebody...

Quote: Originally Posted by KimLaroux  Any IEM can be "designed to be run by a balanced source" by simply chopping the jack off and soldering a TRRS jack in it's place.     w

Quote: Originally Posted by proid  As i have read, the Mini3 outperform a regular cmoy because it has ground channel so i have a Grado Ra1 clone which is a cmoy and sounds very good using two 9V battery and real...