Hi everyone,
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I'm working on a circuit to control the power supply and mute function of a phantom-powered condenser microphone.
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The general concept is mostly in place, and I’d love to get your feedback, especially if you have ideas for improvements or alternative approaches.
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I've attached the schematic for reference.
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Here's a quick rundown of how it works:
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-An NE555 timer is used to generate a trigger pulse when a pushbutton is pressed once.
-This trigger drives an 817 optocoupler to toggle the power (ON/OFF).
-The optocoupler, in turn, controls the 24V supply—regulated through a Zener diode—which powers both the condenser mic and an LED via three FETs.
-While the supply is nominally 24V, due to component losses, the actual output voltage is around 16V.
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I’m also considering replacing the current switching mechanism with a latching circuit for more reliable control.
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Any input, suggestions, or shared experiences would be greatly appreciated. I'm especially curious if anyone has tackled a similar design.
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Thanks in advance!
