Electronics > Projects, Designs, and Technical Stuff
Tips on reducing ripple voltage on linear regulator
sahko123:
I'm designing a headphone amp where ripple voltage on the power supply could really screw with the audio output because of the low voltages required by high efficiency headphones. this is the current design that i
prototyped on a breadboard with semi good results. Good thing is nothing was set on fire but unfortunately at 600ma load at around 12 to 13 volts and has about 30mv ripple voltage. I want to know if there is anything i could do to reduce the ripple voltage. The ripple is in sync with the ripple voltage on the unregulated power supply. The transformer is 150va
bill_c:
Maybe this?
https://www.eevblog.com/forum/blog/eevblog-1116-the-capacitance-multiplier/
You using that -18V somewhere else? cause that doesn't look right.
sahko123:
the -18v is used at the emitter of the current source (bottom most bc547 unmarked because of my lack of attention) and i have a voltage multiplier at the vcc for the discrete opamp error amplifier
rdl:
Why use an unregulated supply if you're worried about ripple?
sahko123:
the circuit above is just the power supply it's the actual regulator. The unregulated voltage gets regulated to around 12v by the circuit above
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