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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
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AC to DC Power Supplies |
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24vac Powered Isolated +5v Supply
-- August 8, 2009 |
24vac is a very popular power supply in many industrial systems. It is often
used in systems that involve water. It is also popular with many inside and
outside lighting systems. The lower voltage means the danger of human
electrocution is much less. But, many DC powered sensors and control
associated with 24vac systems need to be fully isolated from the 24vac supply.
This hobby circuit below accomplishes this feat using an off the shelf 24v DC to 5v
power module. A charge pump scheme using a series capacitor limits the current
to a safe level. A zener diode keeps the input voltage to the module at about
24v DC. Two polarized capacitors wired in series operate as a non-polarized
capacitor. A schottky diode in parallel with witch each capacitor insures that
the part is not reversed biased. With the components selected, the +5v output is
rated at about 100ma. |
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Click on Circuit Below to view PDF of Schematic |
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