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Tech Head - The Technology Section
The Work Bench and Soldering Station
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<blockquote data-quote="Waveguide" data-source="post: 913872" data-attributes="member: 364636"><p>A bouncing ground in the supply to logic circuits is just as bad as spikes in the +5 V line.</p><p>Drawing a schematic of all the ground connections with all wires replaced by small resistors</p><p>can sometimes help to understand what parts are common between the 24 and 5 V</p><p>parts of the circuit. V-shaped lines are nice if they start from the actual power source.</p><p>The large filter capacitor is such a source. Y or X-shaped lines will make voltage drops</p><p>visible on the 5 V part too, they share parts of the wiring.</p><p> </p><p>Another common solution is to add an isolated DC/DC-converter to get lower voltages</p><p>from a 24 V supply. There are many that have an input voltage range that includes 24 V</p><p>and has a 5 V output. You can connect the grounds or leave it floating. Depending on</p><p>what components are connected to both 24 and 5 V the ground can be left floating or</p><p>connected with a resistor to keep the voltage difference within limits. Relays and optocouplers</p><p>don't mind the voltage difference. (in Sweden they cost around 30£ (for 10 W output)</p><p>from a supplier that is considered to be expensive)</p></blockquote><p></p>
[QUOTE="Waveguide, post: 913872, member: 364636"] A bouncing ground in the supply to logic circuits is just as bad as spikes in the +5 V line. Drawing a schematic of all the ground connections with all wires replaced by small resistors can sometimes help to understand what parts are common between the 24 and 5 V parts of the circuit. V-shaped lines are nice if they start from the actual power source. The large filter capacitor is such a source. Y or X-shaped lines will make voltage drops visible on the 5 V part too, they share parts of the wiring. Another common solution is to add an isolated DC/DC-converter to get lower voltages from a 24 V supply. There are many that have an input voltage range that includes 24 V and has a 5 V output. You can connect the grounds or leave it floating. Depending on what components are connected to both 24 and 5 V the ground can be left floating or connected with a resistor to keep the voltage difference within limits. Relays and optocouplers don't mind the voltage difference. (in Sweden they cost around 30£ (for 10 W output) from a supplier that is considered to be expensive) [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
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