Dual Output Variable PSU DC-DC 20W Positive Negative Step Up Down Boost Buck

Description This versatile, amazing dual output (1 positive, 1 negative, same voltage) adjustable power supply can convert from any input voltage between 3.6 to 30V DC and output matching positive and negative from /- 3V to /- 30V DC whether the input is at a higher or lower voltage. I used it successfully to power an S-100 bus card requiring 16V and -16V from a 8V source. Quote from a satisfied customer – “Thanks for the /-v psu. I’d just finished a headphone amplifier which required a /- 12v supply. … Then of cause I came across this buck/boost psu which works a treat. Whats more it fitted in the amplifier box… Job done and sounds great.” Two examples of current use 1. In 5V 2.25A Out /- 12V 0.31A 2. In 12V 1.72A Out /- 5V 1.2A When adjusting the voltage downwards with no load applied, the -ve will maintain the higher voltage.  Power off and short -ve out to gnd and power on and you should see the correct voltage. I’ve measured ripple at approximately 200kHz at 200mV peak to peak when driving 12V at 300mA. Sent Same-Day 2nd Class Royal Mail.  You can level up to 1st class. My support is first class too.  Happy to answer any questions pre or post-sale, promptly and courteously. Specifications from the manufacturers website Input voltage 3.6~30V,output ±3~±30V adjustable Maximum output power: 20W  Conversion efficiency :69-88% Quiescent current: 3mA   20W DC-DC Boost-Buck Converter working frequency 180KHZ.  Operating ambient temperature : -40~ 85 Degrees Celsius   Size : 60 x 34 x 15mm Weight :  33g   High efficiency up to 88% Built in Frequency Compensation Built in Soft-Start Function Built in Thermal Shutdown Function Built in Current Limit Function          Note: 1 In order to obtain a more stable voltage, it is recommended that the output is greater than 15mA 2  V- cannot be used alone, or no voltage output.But you can just use V   3 The startup current of the module is 2.5-3 times the operating current.