A “wired 3.5 mm microphone” is a microphone that connects to a device (phone, laptop, PC, camera, etc.) using a standard 3.5 millimeter audio jack (also called a “3.5 mm plug
Specifications
Spec / Parameter
What it means / Typical Range / Notes
Connector / Output
3.5 mm jack (TRS or TRRS) — the physical plug that connects to PC, phone, camera etc.
Microphone type / Element
Often electret condenser (common for small 3.5 mm mics) or sometimes dynamic. Condenser mics tend to be more sensitive.
Polar / Pickup Pattern
Can be omnidirectional (picks up sound from all around) or cardioid / unidirectional (picks up mostly from front) — affects what sound you capture.
Frequency Response
Typical range: ~ 20 Hz – 20 000 Hz (some mics a bit narrower). This defines which frequencies (low bass to high treble) the mic can capture.
Sensitivity
Usually given in dBV/Pa (or mV/Pa). A typical value for 3.5mm condenser mics might be around −40 dBV/Pa, or similar. Lower (more negative) values = less sensitive.
Signal‑to‑Noise Ratio (SNR)
Indicates how much louder the desired sound (your voice) is compared to the mic’s self‑noise. Higher is better. Good mics often have SNR ≥ ~65–80 dB.
Maximum SPL (Sound Pressure Level)
The loudest sound the mic can handle without distortion. For decent condenser mics: often 110 – 140 dB SPL or more.
Output Impedance
Typical values might be in the hundreds to a few kilo-ohms (e.g. 150 Ω, 470 Ω, or up to ~2.2 kΩ depending on design). Lower impedance tends to be more compatible with many inputs.
Cable Length (if wired)
Usually around 1.5 m – 2.5 m for small 3.5 mm mics, enough for general PC / camera use.
Power Requirement
Most 3.5 mm “plug‑in” condenser mics draw a small voltage (plug‑in power, often a few volts) from the host device.
