Meier Porta Corda
Measures: 11.8 x 6.5 x 2.3 cm
Weight without battery: 100 gr.
Supply voltage: 6 .. (9) .. 28 Volts DC
Mean current uptake: 5 mA (4 mA LED OFF, 10 mA class-A mode)
Maximal amplification: 17 dB
Output impedance: 0 / 120* Ohm * plus adapter
The unit runs from a single 9V battery and the supply voltage is internally splitted in a +4.5 and a -4.5V powerline (TLE2426 railsplitter).
Alternatively external powersupplies can be connected with supply voltages between 6V and 28V DC.
External noise is removed by LC-filtering of the supply voltage.
The total buffer capacity is nearly 6000 uF to lower the effective battery impedance.
For amplification two single LM6171 opamps are used for maximal sonic performance.(No dual or quad-opamps!)
The high quality potentiometer is custom-made by ALPS and has a build-in ON/OFF switch.
The high quality crossfeed/stereo switch has gold-plated contacts and the 3.5 mm sockets are silver-plated.
Only metal-resistors and high-quality film-capacitors are used (polystyrol, polycarbonate, polyester).
The industrial PC-board has a thick 70um copper layer.
Current Prices see site: http://home.t-online.de/home/meier-audio