The B+K Precision Model 1686 is a high quality 3 to 14 Volt DC Power Supply primarily designed for bench powering of automotive and marine electronic equipment. The Model 1686 has a maximum output current proportional to the voltage setting, the maximum current of 12 amps available from 13.8 to 14 volts and is reduced to 2.5 amps at 3 volts. Two panel mounted meters continuously monitor the output voltage and current. The 12-amp output of the Model 1686 power supply allows bench powering of most any car radio, sound system (including most “high- power” car stereo receiver/amplifiers), tape systems, PA systems, and low-to-medium power 2-way radios, such as CB transceivers, VHF/UHF commercial equipment, marine, car telephone, and 2-meter transceivers. The power supply utilizes thermostatically controlled fan cooling for improved heat dissipation and reliability while keeping bulk and weight to a minimum. Foldback current limiting protects the power supply from accidental short circuits and overload conditions. The output is isolated from chassis and earth ground, permitting full flexibility of connections. When desired, the positive (+) or negative (-) polarity outputs may be strapped to ground, allowing use with negative-ground and positive-ground automotive equipment. Advanced design, quality, and sturdy construction of the Model 1686 assures continued reliability. To gain the most effective use of this instrument, we recommend that you study the entire manual before operating the power supply.