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Today's Featured Head-Fi Blog: Jude's Blog
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Pretty much standard. Used Xicon resistors, Xicon caps for the power section and some Muse KZ and Panasonic FMs here and there. Opamp is an AD8512, tube... uh, I don't know, I used the one Jeff sent me
Now looking forward to building some JISBOS... and of course to case it up!
just host them through photobucket (free) and then use the "insert photo" feature to post the direct URLs to the photobucket hosted images when posting your replies on head-fi
My first effort in building headphone amplifiers...
This one is using the C3g, a tube that was exclusively built for the german post in the 60's. A few years back hardly nobody knew this tube, now it's been used here and there...
This really is the ULTIMATE preamp tube. If you want one of the quietest and lowest microphonics tube on the planet, this is your chance.
Quote found on tubedepot...
The schematic is simple and straightforward and uses minimal parts. Resistors are Allen Bradley, Morganite, Holco and Kiwame, bypass capacitors are Oscon and output capacitors Siemens MKV. The psu uses a 5R4GYB (for looks...and rectification), two chokes and mkp caps throughout.
The top plate is 8mm aluminum and was fabricated by a fellow colleague.
The woodwork is veneer over cherrywood and was done by my favourite carpenter (and I nearly went broke over that...)
Continuation of work on my power amp.
It's remote controlled (my roommate's universal remote controls it - remote controlled board is from Welborne Labs), has a soft-start circuit from 41Hz.com, 530VA toroidal transformer from Avel-Lindberg, a muting delay circuit I etched, and a VU meter (lowest two LEDs on left channel blew out on me...). The remote board is connected to a 5V power supply connected directly to the AC inlet. On power-on, the remote board sends 5V out to multiple relays to power on the amplifier and support circuitry.
Buffer circuit I completed using perf-board. I did a PSpice analysis on the input sections of the VU meter and power amp, and it turns out that high-frequencies were attenuated (draws 65mA @ 20kHz) with the VU meter's input filters. I'm throwing in 2 buffer circuits (one for VU meter, one for power amplifier boards) based on the LM4562NA opamp (basically, the buffer circuits are CMoy amps (non-inverting amplifier) set to unity gain). The power supply for the buffer circuits will be two bridged TREADs from Tangent set to +/-12V DC. The primary buffer board has 2 solid-state relays that power the board on when the entire amp is powered on.
Amplifier in action.
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Home: Audigy 2 ZS ---> PIMETA (Class-A Biased, AD8620AR, TREAD Regulator, Custom-built Discrete Diamond Buffer boards on L/R from PPAv2) ---> Grado SR-225
USAFA: Audigy 4 (roommate's computer) ---> DIY GB-150D-based integrated amp (stereo configuration, remote-controlled, power-on delay for output, and heavily class-A biased (3.9mA/channel) LM4562NAs used in preamp section) ---> Yamaha NS-527 (modified with Vifa 6 1/2" woofers, Panasonic film caps in crossover, and heftier internal wiring)
Ghey-C'97 (my piece-o-crap issued laptop) ---> PPAv2 (class-A biased AD8620 (2.5mA/channel), 8600uF pre-regulator, LM338 high-current regulator, 40mA/channel output bias) ---> Grado SR-225 (yes, I bring my headphones home from the Academy during leave)
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Linear Mode
