Electronics > Beginners
Help choosing components for a power supply
derationalize:
Hello all! I would like some help choosing the transistor and component values for my project. I am building a linear regulated power supply. I plan on using several of these in isolation at 9vdc and several with an 18vdc output housed in the same project box. This is for powering audio equipment. The reason I decided not to purchase a device that already does this is because my application requires at least 4 seperate 18v outputs at 500mA. The best available commercial option is the VooDoo labs PedalPower ISO 5, but it is too big in one dimension to fit in the space I have available; therefore I must construct my own. I watched Dave's video on the "capacitance multiplier" to remove power supply ripple and thought it would be a great idea to implement that into the design. I presume I would need a transistor designed for power electronics for this application. Does anyone have any recommendations? Any advice on part selection, component values, or design improvemnts would be greatly appreciated. This is my first project involving anything power related so I'm trying to be safe and not blow something up.
MarkF:
That is NOT the correct way to connect a bypass transistor.
MarkF:
However, why not use fixed regulators? You can get fixed 9V and 18V regulators. Fewer parts.
https://www.digikey.com/product-detail/en/on-semiconductor/MC7809CTG/MC7809CTGOS-ND/1481254
https://www.digikey.com/product-detail/en/on-semiconductor/MC7818CTG/MC7818CTGOS-ND/1481308
Vovk_Z:
--- Quote from: MarkF on January 30, 2020, 04:18:54 pm ---That is NOT the correct way to connect a bypass transistor.
--- End quote ---
TS is talking about capasitance multiplyer not about bypass transistor.
Vovk_Z:
TS forget to add a capasitor after diode bridge. Even if you use capasitance multyplier you still need bulc filter cap after diode bridge before the active filter (about 1000 uF for 500 mA).
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