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(The Variable) My attempt at reverse engineering a Multiplexer. Since EveryCircuit doesn't have one figured I'd try to make one.
The Variable – CD4053 Replica
This circuit is a working model of a multiplexer built from six MOSFETs—three P‑channel on the high side and three N‑channel on the low side. A multiplexer is a device that selects and routes signals, kind of like an electronic switchboard.
The P‑channel MOSFETs handle the input side, tied to the positive rail through inductors and capacitors that help filter and stabilize the signals.
The N‑channel MOSFETs form the output side, connected to resistors and diodes for testing and protection, with the final leg tied to ground.
A voltage divider and timing pulses control the gates, making each MOSFET turn on and off in sequence.
When all six MOSFETs switch correctly, the circuit behaves like a true multiplexer—routing signals cleanly and showing its own cycle on the oscilloscope.
This setup demonstrates how MOSFETs can be arranged to mimic the internal logic of the CD4053 chip, while also being wired to “self‑monitor,” meaning the circuit displays its own switching behavior directly on the scope.
Why Multiplexers Matter
A multiplexer is like an electronic traffic director. Instead of needing a separate wire for every signal, a multiplexer lets you choose which signal goes through a single path at a given time. This saves space, reduces complexity, and makes circuits more efficient.
- In audio systems, multiplexers can switch between different input channels (like microphone vs. music).
- In sensor networks, they allow one microcontroller pin to read many sensors by selecting them one at a time.
- In communication systems, they help route signals quickly without needing extra hardware.
Feel free to copy for your toolbox and expand upon as far as the simulator will let you. 👽
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