Simple bench power supply
thingiverse
I have made a little 'suitcase' with some necessities for working with electronics; soldering iron, helping hands, small multimeter and power supply. To provide a voltage to projects, i use a DC-DC stepdown converter (also 'buck' converter). The stepdown converters are supplied with 24V so i can can set the output to 1..24V DC. The stepdown converter for this project; search for "LM2596 Step Up/Down DC-DC Converter Power Module With Digital Display" It features a pushbutton which enables you to monitor the input or the output voltage. I have made a button to go with this case to still being able to operate that button. Also, the two LEDs indicating 'input' or 'output' are ported to the front of the casing. I did this using a small piece of 1.75mm clear filament which transports the emitted light to the front of the casing, works superb! The stepdown converter has a micro potentiometer which should be replaced by a 10K ohm normal pot. I left the screwconnectors for both input and output accessable for optimum flexibility. On the front panel the output voltage is accessible using 4mm bananaplugs or a series of dupont female jumper wire connectors.
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