EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: d4n13l on April 27, 2017, 06:27:15 pm
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Hello, I'm new to electronics currently working on building a power supply. My plan is going from a simple unregulated one (http://www.eleccircuit.com/wp-content/uploads/2007/08/reg5.gif)
and then build on it until I understand how all parts work, and so get to something like this one (https://1.bp.blogspot.com/-h4GH-Ruu8Zg/U4zr-h_V9eI/AAAAAAAAB4g/T8C5BPwVz7E/s1600/zFoto75.JPG)
1. My problem now is that I want to add digital voltage and amp meters and also I'll need a fan for the heatsink that goes with the 2n3055, but I'm not sure if I should add an independent power supply that provide power for them independent from the rest of the circuit or draw power directly from the main circuit.
2. The fan I have requires 12v while the meters need 5v which in the spirit of learning, I'm thinking of building a linear voltage regulator for them, but for what I understand they are not very efficient, any suggestion how would be better to approach this?
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You will probably need an auxiliary supply for the metering, with many digital meters it is actually a requirement. If you are intending to build a linear power supply such as those in the schematics attached, inefficiency in a small auxiliary supply will not be too significant. A fan could just be run directly from the transformer secondary, unless you plan some kind of speed control. Personally, I would add more convection cooled output capacity before I would use a fan just because it would mean less noise, both audible and possibly electrical.