The EB-803/244 is a triple power supply and regulator, developed for digital systems. The rectifier diodes are soft/fast recovery diodes and the capacitors are low ESR ones. The regulators are using low-noise opamps and MOSFETs as series elements. All three regulators can be configured for operation between 5 and 12 Volt. The output voltage is given by the formula: 2.5(R3+R1)/R1. For 5V output use R1=R3=1k. For 8V use R3=2k21 and R1=1k. For higher voltages use the above formula to calculate the resistor values.
The output voltage can be adjusted with the trimpots if necessary (not included in the kits).

Minimum input-output voltage difference is 4V. For a 5V output the minimum input voltage is 9V, which means a transformer with 7V RMS secondary. For 12V output use a 12V RMS transformer. Maximum power dissipation in the output MOSFETs with SK75-37.5mm heatsink is about 1.5W. With an input-output voltage difference of 5 Volt the maximum current is approx. 300mA. With higher voltage difference the maximum current is less. Output noise over the audio frequency range is <5uV.