This is the device where Dual Trafo Board and SmartPSU3 were originally designed for – external power supply that is simple yet provides some protection in case something goes wrong in the target device. Its current output capabilities are somewhat limited but enough for small DAC and preamplifier. It was designed for HP Pre 2016 although headphone output power may be somewhat restricted with this power supply.
SimplePSU3 contains three simple 3-pin adjustable regulator circuits. Its one dual (analog) supply and one single (digital) supply suits especially well mixed signal audio circuits. Regulators are placed on the edge of the board for mounting on heatsink or chassis.
SmartPSU3 provides three fixed relay-switched regulated and monitored low-power voltage outputs. As it has one positive and one dual positive/negative supply, it fits well for mixed signal audio applications, such as DACs, where dual analog supply and single digital supply are required. All channels use linear regulators for low-noise output.
Dual Trafo provides three unregulated low power voltage rails for mixed signal devices, such as DACs. The board can be followed by a regulator board such as SmartPSU3 or SimplePSU3 (without filter capacitors) or it can be used to feed application board’s regulators.