Hi All, Finished my first amp (PIMETA) a few weeks ago and have been enjoying it a lot. I switched over to the line out of an ipod for my current source and the original gain (I think I came up with something like 10.5 - the multiloop complicates it a bit) is a bit too much for when I use my...

Hi All, Finished my first amp (PIMETA) a few weeks ago and have been enjoying it a lot. I switched over to the line out of an ipod for my current source and the original gain (I think I came up with something like 10.5 - the multiloop complicates it a bit) is a bit too much for when I use my...

Looking at the Class A biasing method for PIMETA, I have a question. I understand the point of the current source (to force the opamp's output stage single ended using the faster BJT's) but am a little confused on the effect that the cascode has on the load resistance of the opamp. The...

I am starting an order for the parts to build one of these up and was wondering about a few of the parts: I can't seem to find the crystal resonator in the schematic (12MHz 16pf load), I can find 12MHz 18pf which should just require different load caps. This leads to the question of why the...

I was looking to put together a PIMETA and was wondering if anybody knew of a place that currently has any BUF634s in stock. I had read in some of the replacement buffer threads that some people still had some extras laying around... I would be very grateful if anybody who does could contact me...

I'm going to be builidng a dynalo soon, and I'm trying to find the best way to measure hFE for transistor matching. I'm also going to be buying a multimeter soon, and I see many have the ability to measure hFE. Is this an accurate method? My other method revolves around what hFE actually...

I was hoping I could get some headphile advice on a pair of good closed cans for office use. I'm on my first co-op during college and was happy to see many people listening to cans at their desks, so I would like to join them . The first few paychecks are burning a hole in my wallet, but I...

Hey Everyone, I'm using an Ipod as a portable player and basically want some way to actually equalize my songs to my liking (none of this preset 'ultra bass' or anything) so I was thinking I could save songs with whatever settings i'd like on the computer before transferring them to the Ipod...