Quote:   I don't intend on using them bare...rather, I'd put a small value resistor in series with it (say, three 10-ohm resistors). This would get the value of the driver somewhere near 32 ohms. I measured the resistance at 3.2 ohms each and the inductance at 18 uH. At 20 Hz, the...

  So, here is a schematic for you guys. It's nothing new or innovative...just an op amp driving a bank of eight output transistors. The transistors are small but the sheer number of them allows much more power than is necessary.   Again, I made this amplifier for op amp swapping. Right...

Hi All,   First of all, I will say that I don't at this point have any images or schematics. I will work on uploading some tomorrow but for now I just have to describe this circuit. Sorry   The amplifier is a transistor power amp with an output stage like a Gilmore Dynamic amp...four...

The problem with using a tube amplifier and transformers is that you have to have a separate tap for each individual headphone impedance. The plate of any given tube wants to see a certain ohm value for the best power out. Even though we're talking 100-200 milliwatts here, we're also talking 30...

The problem with using a tube amplifier and transformers is that you have to have a separate tap for each individual headphone impedance. The plate of any given tube wants to see a certain ohm value for the best power out. Even though we're talking 100-200 milliwatts here, we're also talking 30...

I raided a thrift store today and got some Logitech speakers for $1.50. They quickly met with my hammer and I harvested the drivers.   Quick measurements reveal that the drivers have 3.2 ohms of series resistance and about 18.5 uH of inductance. There are four of them. I thought they would...

Quote:   I've considered using them as power supply filter caps. Since they normally come in values like 8 to 10 uF, I'd have to get several of them to make one large bank. 60 uF is much more appropriate for a power supply blank.   If I built this I'd have to use a different tube. I...

Not yet. Unfortunately, I was building a radio today with one of my 12DQ6s and found that it had a short between grid and cathode that only showed up after about a 10 minute warm up cycle. I had to toss the tube and choose another. I could look into using another tube. As for now, I won't be...

Hi all,   I have a couple of 12DQ6s in my toolbox. I don't intend to use them as transmitting tubes because I have quite a few other tubes that will successfully fulfill that purpose. I am considering using these at low voltage to drive headphones through a transformer. Here is what I'm...

Hi all,   I have looked into doing this with shredded CAT5 cable. I have, however, made an audio interconnect that's about 9" long terminated in two 3.5mm connectors. It picks up an annoying level of noise especially when I place my hand next to it. Still, that's a low-level signal wire...

These are my builds. They are like a Szekeres headphone buffer with some differences. There was a project like this on DiyAudioProjects.com but my amplifiers are a little different still.   My first build. The base is a polished and lacquered piece of plywood. I wanted to keep it simple...

I do believe that this is my first post here.   I'm starting to do research for a future project I want to do. I want to make my own dynamic headphones. The cups will be carved out of some sort of hardwood (maple might be my wood of choice, although I'm not sure yet. The main problem I have...