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13.8V high current power supply
Hi all,
You may recall me mentioning I was thinking about adapting a 24V PSU for use at 13.8V for powering up mobile HF rigs and stuff. I had some spare time yesterday and took this thing to bits for a better look inside. It turns out the mains transformer has several secondary tapping points. I discontected the DC-stab/reg side of the supply circuitry and reconnected the secondary tapping points to lower voltage tappings. Now I measure 16.8V after the transformer's output has been rectified and applied across the *big* electrolytic. This is under no-load conditions. Now, is that 3V enough 'headroom' to use up in regulation and stabilisation for 13.8V final output if I throw the old 28V reg/stab away and build something from scratch? There are 6 pass transistors plus a driver (2n3055) already mounted which I plan to use in the adapted version, so basically I'll just junk the existing control board and re-use everything else. Any observations/tips? Thanks, P. |
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