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Interlude time now, in between writing up the Calibration procedure for the M328.. We will push this little one in to keep you all happy.

I have a few various projects to build over the next couple of years, some that will require a regulated supply to feed various DC Volts  (low noise is a must!).  I had been running through my mind various ideas using regulators on some stripboard to mate up  the supply rails,  I had a few emails between my friend G0FTD  on the subject, he said take a look at these "5" seperate LM317 boards already made up on a PCB, complete with heatsinks for just over £5 ($8 US), which works out at just over £1 each! I couldn't even buy the heatsink for a £1 over here, never mind the LM317 and the PCB.  I ordered five they arrived within 10 days from HK, a couple of  the LM317's were not bolted up tight to the heatsinks, but a quick tighten with a screwdriver and all was ok, what a bargain!




Time to test one.
Most of what I will be requiring is between 3.3V and  5V with a 12V dryfit battery on the input end.

To prove I just rigged up a quick lash up with 15V feeding one module from my bench supply:



I was able to able to obtain a precision swing of between 1.25V & 13.5V as the the output is made variable with a multiturn pot attached to the PCB, ideal for what I am looking for. 






Conclusion: Another good purchase from China that is useful, money and time saving in project building!

Not only have I come across various types of regulator modules (some switching types so be careful!), but also LM386 Audio Amp modules, Timer modules and even a 3 Axis Magnetometer PCB built and ready to go!