DROK Micro Dual Power Supply - DC to DC Buck Boost Converter 4.8-35V to ±15V Positive Negative Dual Output, Step Up Voltage Regulator for OP-Amps

I needed a reliable and stable 5V voltage source to power an Arduino board and some small electronics on my truck. This was a cost-effective solution, taking my ~12V truck voltage and converting it to 5.0V. It's a good form factor, operates efficiently and dissipates minimal heat. I'm quite pleased with it.

I have a vintage bass guitar that needs +/- 15 to 20 volts. The bass has a heavy, awkward power supply box to provide that, but with this converter I was able to build the whole thing into my pedalboard, just taking standard 9 volts from the pedalboard power supply. Very quiet and the bass works cleanly. Perfect niche application for a niche product.

It seems to be a well-built unit and it worked. But, be aware that it requires numerous external components to function properly and the power output de-rates when using a 5V input. See the photo of the application notes which came with the unit.

This is a really neat module. Performs as advertised. Operates and buck or boost over wide range, providers ground-referenced +/- 15 vdc. Remarkably low ripple at the output, better than my cheap Chinese variable supply with current limit. The controller chip labeling has been scraped off, but probing the switch pins it's clearly a flyback regulator similar to LM2587 (different pinouts) attached to a transformer. It requires a minimum load of 30 mA, and with 1/2 watt resistors they still reach 70 decrees C... BE CAREFUL! Update: I was working on an op-amp project and my cheap adjustable supply blew a capacitor, got 2 volts ripple on the output. I took this DROK module and fed it with 2x 18650 batteries and was back in business! +-15 volts from 2x18650s, love it!

Final edit: Tossed it in the land fill. Noise was too much. Don't waste your money. Buy instead Eletechsup +-5V 6V 9V 10V 12V 15V 24V Positive & Negative Dual DC DC Boost-Buck Converter (with Terminal, 5). No Noise with minimal filtering. Much, much better. Tried to use it in an audio circuit to power two 741 op amps. Too noisy to be used in this application. Filtering per their included instructions made no difference. Replaced it with two 9V batteries. Update: I continued toying with it, using different combinations of components. 8 capacitors, an inductor, and 2 voltage regulators later I got the noise level down enough to be tolerable. The necessary added components makes this item not very cost effective.