Technics SA E10 Schematic
...
Speech Board for SPO256
This board does NOT use the CTS256AL2 text-to-speech chip. [It would seem that both SpeechChips.com and JDR still have some of these chips, though, if you're lo...
vintage KOSS 1220
Two KOSS A-1220 headphone amps. Each share the same model number, yet have completely different internals: One uses just a single 12AU7, while the other has a 1...
High-Quality Stax Headphone Adapter
This project allows one to build a very high quality version of the Stax SRD-7MkII headphone adapter to allow one to use an existing favorite amplifier to power...
Headphone Limiter
I need one to put in between my headphones and my metal detector. I don`t need anything fancy, but would like to be able to use a pot and make it variable. I`m ...
Phenix G3/Chinese Earmax
This is the version with 3 6N11 tubes. And as far as I can see identical to the Phenix. It looks and feels very well made. The separate power supply is a bit bu...
The Xonar Essence STX
This is where the fun begin - the sound is hmm. "organic". Everything seems to smooth a bit compare to LME49720, a very subjective word. "musical" Also I hear m...
Passive EQ for STAX
Many audiophiles reject equalizers for various reasons, some of which relate not to the EQ circuit itself (or algorithm) but to the surrounding "glue" of op-amp...
install-a-piezo-bridge
Inexpensive buffer circuit suitable for using to mix passive pickups with EMG active pickups, or buffering piezo pickups to mix with magnetics. Frequency respon...
Distortion Fiends
...
Shure SM58 issues
...
Cornet2 Vacuum Tube Moving Magnet Phonostage
This little phono stage completely trounced my sub-mini phono preamp. The phono preamp was extremely quiet with my vintage Grado 8MR cartridge (not MC). This is...
Clarinet Vacuum Tube Linestage
The Clarinet preamplifier is agile, detailed, and warm without being euphonic. It has excellent soundstaging, tonal balance, presence, and palpability. It is fa...
pultec
...
Gyraf Audio
The G9 project is an adaptation of the Gyratec IX dual microphone/line/DI preamplifier to suit the DIY`ers demands. Searching the net, I`ve never come across a ...
gic
My design is somewhat like a combination of the circuits in M49 and U47, but mounted with the tube used in U67. There`s really not a lot of complicated electron...
Gyraf Audio EQ
This pages contain information about building your own version of the Calrec PQ1549 Equalizer, the one found in the Calrec "Polar" desk. This EQ is one of my ab...
Tandy PZM mics pre-amp
The Sennheiser Dummy Head Stereo recording was a huge breakthrough in the concept of recording at the time. It enabled the reproduction of 3D information as our...
GOL tremelo project
This is a really good project for anyone wanting a good old fashioned tremelo pedal using the original optical coupling technology employed in such things as th...
Aussie Guitar Gear Heads
...