Your iron might not be hot enough. Insufficient heat prevents the solder from flowing smoothly. A worn-out or dirty tip hinders heat transfer and solder flow. Use a damp sponge or a specialized tip cleaner to remove oxidation and residue. Apply a thin, even coat of solder to the tip before each use. This improves heat transfer and prevents solder from sticking to the iron.🙂

The uneven distribution of voltage across the series-connected regulators and the overall instability of the circuit make this configuration highly unreliable. To achieve higher output voltages, it's recommended to use a higher voltage regulator, a step-up DC-DC converter, or parallel connection of identical regulators with proper balancing.🌹

Determine the required power output (watts) of the regulator. This will dictate the component choices and overall design. Will the input voltage always be 80V, or will it vary? If it varies, what is the acceptable input range? How precise does the 220V output need to be?

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Yes, if you need to convert 12V to 9V, a 7809 voltage regulator is all you need. The 7809 is specifically designed to provide a stable 9V output, and your 12V input is well within its operating range. The 7809 can get hot, especially at higher currents. Make sure to use a heatsink to prevent overheating.

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