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--- glossary:glossary_d [2016/09/27 13:56] – [Digitrax] thenudehamster
+++ glossary:glossary_d [2018/01/24 11:29] – [Diode] Bob Vetterlein
@@ Line 61: / Line 61: @@
 The DIODE is an electronic component that allows the passage of current in only one direction.     \\ [[:glossary:diode|Main article]]
+===== Dirty PSU =====
+"Dirty" PSU is BBC Engineer speak for a good, regulated and clean power supply that has a dirty job to do.....supplying relays, servos etc.\\
+ If the feed wires from PSU to load are of sufficient length to have a bit of impedance and supply several loads, then the dirt caused by one load can cross to other loads. This would usually be positive & negative sharp spikes superimposed on the dc. If the PSU is inadequate and feeds clean and dirty loads then the effects can also cause Pic ( or other microprocessor ) "brown-outs" which may force a re-boot or even more subtle disturbances to your previously happy data digits.\\
+ The separation of the digital low current circuitry with a separate "clean" PSU is one of the classic precautions to be observed ( as you and we all are frequently reminded on the MERG forum! )