At ecp, we cut our teeth on DIY. We're still involved in the DIY community, and we think that it is where the most forward thinking in audio comes from. Watch this space for one-off designs and surplus parts for sale, and of course for new D.I.Y. projects.

I am slowly transitioning my old DIY projects over to this site, so please bear with me if you run into dead links.

• Headphone Amps
• *NEW* The Caged Frog 2: A Differential, Pentode Based, Transconductance Amplifier for Headphones
• The Caged Frog: A Pentode Based, Transconductance Amplifier for Headphones
• *NEW* The Baby Frog: A MOSFET Based, Single Ended Transconductance Amplifier for Headphones
• The Shining Path: A Shunt Regulated, Single Feed, Spud Amplifier for headphones
• Modding the Melos SHA-1 Headphone Amplifier.
• A High End Transformer Coupled Single Ended Modular Headphone Amplifier
• A version of Pete Millett's Starving Student Headphone Amp
• L'espressivo Project -- Parafeed Spud Amplifiers for Headphones
  • L'espressivo 1.0 -- the original -- A low cost, autoformer or transformer coupled, parafeed, single ended, modular headphone amplifier based on the Espressivo, or How to build a real tube headphone amplifier for about $100 (Beta design). (this was formerly known as the Less-pressivo)
  • L'espressivo 1.0 build instructions!
  • L'espressivo 2.0 -- an upgraded version of the L'espressivo
  • L'espressivo 3.0 -- * updated 10/18/2008 * -- the newest iteration of the L'espressivo
• The RA-1 Project
• Modding the Grado RA-1
• Re-modding the RA-1
• DC Coupled Mosfet Follower for Headphones
• Digital to Analog Converters
• The HPDAC Project
• The Original HPDAC - A TDA1543 Based USB Powered Non Over Sampling USB DAC with built-in Headphone Amplifier
• The HPDAC 1.1 - A TDA1545 Based USB Powered Non Over Sampling USB DAC with built-in Headphone Amplifier
• The HPDAC2 - A PCM1798 Based Oversampling USB Powered USB DAC with built-in Headphone Amplifier
• The HPDAC3 - A PCM1794 Based Upsampling and Oversampling USB DAC with built-in Headphone Amplifier
• The HPDAC3.1 - A PCM1794 Based Upsampling and Oversampling USB DAC with built-in Headphone Amplifier
• The HPDAC4 - A TDA1545 Based Non Over Sampling DAC with built-in Parafeed (L'espressivo) Headphone Amplifier
• The HPDAC5 - A Differential TDA1543 Based Non Over Sampling USB DAC with built-in Transformer Coupled Mosfet based Headphone Amplifier
• The HPDAC6 - A Differential WM8741 Based DAC with built-in (DSHA) Transformer Coupled Differential Mosfet based Headphone Amplifier
• A Quick and Dirty WM8741 Based DAC
• An AD1865N-K based NOS DAC with a Parafeed output stage
• A Modular Upsampling/Oversampling Balanced DAC
• Modular NOS DAC Prototype
  • AD1865N based DAC Module
  • TDA1541A based DAC Module
  • TDA1545 based DAC Module
  • 5687 based Vacuum Tube Gain Stage
• A TDA1541A Based Non Over Sampling USB DAC
• A TDA1543 Based Non Over Sampling USB DAC
• Other Projects
• A Phonostage using all 7-pin tubes.
• An Experimenter's Breadboard for the D3a.
• Low Voltage, All Tube, Guitar Amplifier for Headphones
• Some old stuff
  • The MEHA - a low voltage Hybrid Headphone Amplifier Loosely based on Work by Pete Millett
  • Low Mu Power Triode Linestage
  • NSSPS (The Not So Simple Phono Stage)
  • DIY Project to Build USB To S/PDIF Converter
  • DIY Tube Buffered Passive Preamp Project
  • DIY Solid State Buffered Passive Preamp Project
  • SSBNIGC w/ USB->S/PDIF, NOS DAC, and Hagtech Bugle
  • 41Hz Amp1-B Class-T Power Amplifier
  • Elvis Presley Phono Stage

• Notes on Output Coupling Capacitors
• Notes on the Bottlehead C4S (Constant Current Source)
• Review of the Guzzler DIY USB DAC
• DIY Resources