Power Supply +24V / -24V 3A for amplifier hifi

The main power supply is relatively conventional – the mains supply is presented to the torroidal transformer via a fuse, a thermal cut-out and the power switch. A device that looks like a VDR is mounted on the power switch…

The secondary windings produce ±24V nominally using discrete diodes and 2 reservoir capacitors. The second pair of capacitors is fed via 0.47Î© resistors which reduce ripple by a good amount – I measured 0.8V pk-pk across C3 and 0.25V pk-pk across C4. A cheaper version of the choke PSU’s that MF use these days…
The smoothing capacitors are rated at 25V – rather close to the limit in my opinion!

Source:http://www.mhennessy1.f9.co.uk/mf_a1/technical.htm
Thank you.

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