With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
We have a be nice comment policy. Please be positive and constructive.
We noticed you attached photosto your comment.
You should attach a DC voltage at it's INPUT that is higher than the 12 volts expected output voltage. The input must not exceed the LIMITS of the device. Less than 25 volts is probably ok. Connect the GROUND terminal also. Then look to see if the OUTPUT is 12 volts within the limits of 11.9 to 12.1 aprox. ALSO you should look at the output with an oscilloscope to be sure the device does not OSCILLATE. This would appear as a ripple in your output. The output should be SMOOTH DC with only a few millivolts of ripple. The device should be BOLTED to a heatsink for this test so it does not overheat and die during testing. SOME regulators are NEGATIVE output regulators. They have a MINUS output, so be sure to connect the input properly in that case. Usually a normal regulator will have a serial number starting with the number 78 such as ua7812. That would be a POSITIVE 12 volt regulator. If it has the number 79... then it is a NEGATIVE output regulator.... ua7912 is negative output.
Inexpensive 5 volt Switching Power Regulator
Playing with Voltage Regulators
How to make a Molex Power supply
Hack Voltage Regulator 7805 Into Temperature Sensor
Using a DC-DC Adjustable regulator to power a load
Convert a 5v PIR Motion Sensor to 3.3v for ESP8266
How to Get Emergency Power from a Phone Line
DIY Hacks and How Tos
Dual Voltage Regulated Power Supply
Regulated Power Supply
5 Volt Regulator
Posted:Mar 3, 2010
Join 2 million + to receive instant DIY inspiration in your inbox.
© 2016 Autodesk, Inc.