I got some PCBs fabricated and built a couple of Objective2 headphone amps with the default 2.5 and 6.5 gain levels. Only quality components from DigiKey have been used, the output capacitors have been increased from 2.2 uF to 3.3 uF for even better bass frequency response.
This amp is in the recommended enclosure, with silver front panel and black back panel from Head'n Hifi. The power connector is on the backside. Note that you'll need a 15VAC power adapter (see suggestions here).
There are no battery terminals in this amp, making it ready for installation of the ODAC (pdf).
For more info on the Objective2 headphone amp, see NwAvGuy's blog: http://nwavguy.blogspot.se/2011/08/o2-details.html
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I offer complete preamplifier kits for turntables. There are currently four kits available:
- A phono preamplifier for MM and HOMC cartridges
- An MC head amp that lets you use LOMC cartridges with any MM phono stage
- A power supply for the two preamps
- A back panel for the two preamps
The kits are complete with all necessary components, easy to build with detailed step-by-step instructions, affordable and customizable.
See https://muffsy.com for more information.