Euraudio PS1S specification
Welcome to the Euraudio PS1S specifications, in which you can read about the system requirements (application criteria), operation and technical data of the PS1S.
The PS1S is a symmetrical (+/-) power supply with a ground loop breaker circuit, and is recommended for home-made audio amplifiers. Please find the PS1Sc assembly instructions here, which contains information about the sizing of the filter capacitors and fuses.
It can be used for amplifiers that need a dual or in other words symmetric (+/-) supply voltage. Tip: The PS1S can be used for the Euraudio LDA17mc, LDA17hc, LDA172mc, and LDA172hc ultra low distortion, low noise audio amplifiers as well.
See Technical Data.
The PS1S rectifies the two sinusoidal AC voltages connected to its input, then it smooths it by using filter capacitors, thus generating the symmetric (+/-) supply voltage that is necessary for most audio amplifiers.
To void ground loops, the grounding of the PS1S has a star-like arrangement, furthermore the PS1S contains a so-called ground loop breaker circuit, which prevents hum from appearing through the earthing conductor, if devices with earth ground protection against electric shock are connected to your amplifier, and the chassis of your amplifier is also earthed.
At the input of the rectifier bridge, there is space for a snubber RC network (R91, C91), that may be sized in order to decrease the oscillation between the leakage inductance of the transformer and the capacitance of the rectifier together with stray capacitance of the transformer. Installing the snubber network is not mandatory, and its sizing procedure is not part of the documentation. However, if you're interested, here's an article about it: http://www.hagtech.com/pdf/snubber.pdf.
At 25°C ambient temperature unless otherwise noted.
Bridge rectifier input voltage: max. 2x65 VAC
Size of applicable filter capacitors: snap-in type, max. 35 mm diameter
Allowed continuous output current (Ta=50°C): max. 7 A (both channels operating); max. 5 A (only one channel operating)
Recommended maximum audio amplifier power (class B or AB, Ta=50°C): 2x100 W / 4 ohms; 1x200 W / 4 ohms; 2x150 W / 8 ohms; 1x300 W / 8 ohms
Allowed continuous output current (Ta=50°C): max. 8 A (both channels operating); max. 5 A (only one channel operating)
Recommended maximum audio amplifier power (class B or AB, Ta=50°C): 2x125 W / 4 ohms; 1x200 W / 4 ohms; 2x150 W / 8 ohms; 1x300 W / 8 ohms