I have designed and 3D printed an adapter bracket that will hold a circuit board in place inside the Philmore PS123 power supply. The circuit board will be a hand assembled version of the LM338 control circuit mentioned earlier. (LINK)
The Fusion 360 bracket model is shown below. The bracket sits on the bottom of the cabinet. The small holes align with the circuit board mounting holes for the original control circuit board. The large holes are to clear the screws that mount rubber feet underneath the cabinet. The circuit board is 80 mm wide and 60 mm high. The 80 mm side slides into the slot with components extending into the inside of the cabinet.
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A photo of the bracket installed in the cabinet, adjacent to partially populated circuit board is shown below.
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Below photo shows the circuit board as it will be installed. Terminals blocks on the edge of the board are, from left to right, LM338 connections, power in from rectifier, power out to binding posts.
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