Upgrade Power Supply: 10K Potentiometer Guide

Enhancing the versatility of the system involves the simple addition of a 10K potentiometer, enabling adjustable modifications. This adjustment spans from an unloaded 12-50V range to a loaded 1-50V range.

To facilitate this modification, essential components include a 3296 long-handle 10K potentiometer and a single-display voltmeter. The connection method for the potentiometer involves picking up R23 for voltage adjustment. Connect the picked-up end to the slider of the potentiometer, and the other two ends to pin 13 of 494 and the output negative pole, as illustrated in the accompanying diagram.

Given the direct connection of J13 to the negative pole, a straightforward soldering process is sufficient.

For the voltmeter's power supply, connect it to D15D16, constituting the circuit that powers 494. Solder the two diodes together, ensuring the interconnection of their positive ends.

Strategically drill holes to secure both the voltmeter and the potentiometer in place.

During the fixation of the 3296 potentiometer's nut, employ a card slot cut-out to create a buffer between the nut and the casing. Subsequently, secure the screw with adhesive. After the adhesive application, remove the card slot, minimizing friction between the nut and the casing while maintaining a consistent distance.

Load testing yielded noteworthy results, including 0.9V at 15.9A and 1.8V at 15.9A, causing the heating wire to exhibit a red glow.

Prioritize a temporary pause in the load test to address the transfer of heat from the heating wire to the copper wire, leading to insulation melting. This brings the power supply system to a state ready for practical utilization.