BOM-DAT/capacitor-dat/capacitor-dat.md
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@@ -2,6 +2,7 @@
2 2
# capacitor-dat
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4 4
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+- [[capacitor-dat]] - [[capacitor-dc-blocking-dat]] - [[capacitor-MLCC-dat]] - [[sensor-microphone-dat]]
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6 7
- [[circuits-dat]] - [[PCB-design-dat]] - [[resistor-dat]] - [[capacitor-dat]] - [[RCL-dat]]
7 8
Chip-cn-dat/STC-dat/STC-dat.md
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@@ -57,7 +57,7 @@ SCH 4 == [[CAN-dat]] - [[PWM-dat]] - [[DAC-dat]] - [[STC-dat]]
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![](2026-02-12-15-08-40.png)
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-SCH 5 == [[Oscilloscope-dat]] - [[display-dat]]
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+SCH 5 == [[oscilloscope-dat]] - [[display-dat]]
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![](2026-02-12-15-15-39.png)
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Sensor-dat/sensor-microphone-dat/sensor-microphone-dat.md
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@@ -42,6 +42,47 @@
42 42
- **Technology**: ECMs use a traditional electret condenser design with a FET, while the MAX9812 is an analog microphone with AGC, and the ICS-41434 uses MEMS technology.
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44 44
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+## capacitor and reading
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+
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+- [[capacitor-dat]] - [[capacitor-dc-blocking-dat]] - [[capacitor-MLCC-dat]] - [[sensor-microphone-dat]] - [[filter-high-pass-dat]]
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+
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+### Isolate the AC Audio Signal (DC-Blocking Capacitor)
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+* **Why it's needed:** The microphone’s internal pre-amplifier (PA) outputs an AC audio signal riding on top of a DC bias voltage. Direct connection to an ADC or an amplifier could damage the receiving chip or saturate the signal.
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+* **What to use:** Place a non-polarized ceramic capacitor of **at least $1\mu\text{F}$** (such as an 0805 X5R/X7R capacitor rated for 10V or higher) in series with the **OUT** pin.
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+* **The result:** The capacitor acts as `a high-pass filter`, blocking the DC voltage and allowing only the shifting AC audio waveform (centered around $0\text{V}$) to pass through to your reading device.
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+
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+---
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+
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+### 3. Reading the Output Signal
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+Once the signal passes through the $1\mu\text{F}$ capacitor, you can read it in several ways depending on your application:
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+
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+#### Option A: Reading with a Microcontroller (MCU) ADC (e.g., ESP32, Arduino)
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+
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+- [[voltage-divider-dat]] - [[sensor-microphone-dat]]
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+
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+Since standard microcontroller ADCs cannot read negative voltages (and the AC signal after the capacitor swings above and below $0\text{V}$), you must **add a DC bias offset** (typically $V_{CC}/2$):
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+1. **Create a Voltage Divider:** Connect two equal resistors (e.g., $10\text{ k}\Omega$ to $100\text{ k}\Omega$) between your MCU's $3.3\text{V}$ line and Ground.
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+2. **Bias the Signal:** Connect the middle node of the voltage divider to the output side of your $1\mu\text{F}$ capacitor.
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+3. **Read:** Connect this biased line directly to the MCU's Analog Input (ADC) pin. The audio signal will now oscillate around $1.65\text{V}$ (safe for the ADC to read and sample).
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+
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+
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+#### Option B: Reading with an Audio Amplifier or Codec
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+
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+- [[BK2716-dat]] - [[codec-dat]] - [[voltage-divider-dat]] - [[sensor-microphone-dat]]
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+
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+If you are sending the audio to a speaker, headphones, or a dedicated audio chip:
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+* Connect the output of the $1\mu\text{F}$ capacitor directly to the **MIC_IN** or line-in pin of an audio pre-amplifier (like the BK2716 amplifier referenced in the datasheet's test setup) or an audio codec chip. These chips usually have built-in high-impedance inputs designed exactly for these signals.
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+
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+#### Option C: Measuring with Lab Instruments (Oscilloscope / Multi-Analyser)
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+
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+- [[Oscilloscope-dat]] - [[voltage-divider-dat]] - [[sensor-microphone-dat]]
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+
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+- [[BK3160-dat]]
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+
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+To visualize or analyze the raw audio waveform:
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+* Connect the Ground probe of your oscilloscope/analyzer (e.g., BK3160 Multi-Analyser) to the circuit Ground.
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+* Connect the active probe to the output side of the $1\mu\text{F}$ capacitor.
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+* Set the oscilloscope channel to **AC Coupling** and adjust the scale to millivolts ($mV$), as the typical sensitivity of the microphone is around $-42\text{ dB}$ ($7.9\text{ mV}$ RMS at a standard loud volume of $94\text{ dB SPL}$).
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## ref
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Tech-dat/codec-dat/CODEC-dat.md
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-- [[codec-audio-dat]] - [[codec-dat]] - [[audio-dat]] - [[I2S-dat]] - [[arduino-audio-dat]]
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+- [[codec-audio-dat]] - [[codec-dat]] - [[audio-dat]] - [[I2S-dat]] - [[arduino-audio-dat]] - [[media-dat]]
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- [[mp3-decoder-dat]] - [[SSL1014-dat]]
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Tech-dat/filter-dat/filter-high-pass-dat/filter-high-pass-dat.md
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# filter-high-pass-dat.md
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+
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+- [[capacitor-dat]] - [[capacitor-dc-blocking-dat]] - [[capacitor-MLCC-dat]] - [[sensor-microphone-dat]] - [[filter-high-pass-dat]]
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+
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+
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+## chips
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+
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+
5 12
HFCN-7150+ == 50Ω 7900 to 11000 MHz 50Ω 7900 to 11000 MHz
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https://www.minicircuits.com/pdfs/HFCN-7150+.pdf?srsltid=AfmBOoow6iS2B2lSnl-_MXiuSFoff_SCtH9EXMZSy7rvSho_sH9H-nMu
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@@ -14,4 +21,10 @@ FEATURES
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- Hermetically Sealed
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- LTCC Construction
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- Low Cost
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-- Protected by US Patent 7,760,485
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\ No newline at end of file
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+- Protected by US Patent 7,760,485
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+
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+
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+
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+
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+## ref
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+
Tech-dat/media-dat/media-dat.md
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- [[audio-dat]] - [[image-dat]] - [[video-dat]] - [[media-dat]]
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-
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+- [[codec-audio-dat]] - [[codec-dat]] - [[audio-dat]] - [[I2S-dat]] - [[arduino-audio-dat]] - [[media-dat]]
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## ref
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\ No newline at end of file
Tech-dat/oscilloscope-dat/02-58-18-07-03-2023.png
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Tech-dat/oscilloscope-dat/oscilloscope-dat.md
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-
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-
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-# oscilloscope-dat
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-
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-
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-
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-
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-arduino oscilloscope
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-https://dbuezas.github.io/arduino-web-oscilloscope/
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-
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-wave of UARTS Data
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-
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-- 196678365
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-
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-![](02-58-18-07-03-2023.png)
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-
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-
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-## spectrum analyzer
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-
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-[Spectrum Analyzer](https://academo.org/demos/virtual-oscilloscope/)
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-
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-## Selection
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-
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-$299 12bit == https://youtu.be/3hyp0-0ns9U?t=680
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-
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-
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-
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-
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-## ref
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-
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-- [[fab-tools-dat]]
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\ No newline at end of file
Tech-dat/tech-dat.md
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- [[amplifier-dat]] - [[codec-dat]] - [[amp-op-dat]] - [[LNA-dat]] - [[amplifier-audio-dat]] - [[amplifier-GNSS-dat]]
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+- [[codec-audio-dat]] - [[codec-dat]] - [[audio-dat]] - [[I2S-dat]] - [[arduino-audio-dat]] - [[media-dat]]
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+
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- [[filter-dat]]
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- [[transmitter-current-dat]]
app-dat/Oscilloscope-dat/2026-02-12-15-13-29.png
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app-dat/Oscilloscope-dat/Oscilloscope-dat.md
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-
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-
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-# Oscilloscope-dat
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-
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-
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-- [[voltage-dat]] - [[voltage-reference-dat]]
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-
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-- [[signal-dat]] - [[wave-dat]]
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-
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-
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-
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-
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-## SCH
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-
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-![](2026-02-12-15-13-29.png)
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-
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-- [[STC-dat]]
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-
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-## ref
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-
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-
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-- [[instrument-dat]] - [[oscilloscope-dat]] - [[multimeter-dat]] - [[tools-dat]] - [[fab-workspace-dat]]
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\ No newline at end of file
fab-tools-dat/fab-tools-electronic-dat/Oscilloscope-dat/02-58-18-07-03-2023.png
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fab-tools-dat/fab-tools-electronic-dat/Oscilloscope-dat/2026-02-12-15-13-29.png
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fab-tools-dat/fab-tools-electronic-dat/Oscilloscope-dat/oscilloscope-dat.md
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@@ -0,0 +1,63 @@
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+
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+
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+# Oscilloscope-dat
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+
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+An oscilloscope (informally called an `O-scope` or scope) is an electronic test instrument that graphically displays varying electrical voltages as a function of time. It essentially acts as a high-speed visual graphing tool for signals, allowing you to measure properties like amplitude, frequency, rise time, and distortion.
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+
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+
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+
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+- [[Oscilloscope-dat]] - [[fab-tools-electronic-dat]]
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+
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+- [[voltage-dat]] - [[voltage-reference-dat]]
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+
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+- [[signal-dat]] - [[wave-dat]]
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+
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+
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+## target
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+
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+- [[Oscilloscope-dat]] - [[voltage-divider-dat]] - [[sensor-microphone-dat]]
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+
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+## S2026-02-12-15-13-29.png
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+
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+![](2026-02-12-15-13-29.png)
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+
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+- [[STC-dat]]
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+
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+## ref
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+
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+
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+- [[instrument-dat]] - [[oscilloscope-dat]] - [[multimeter-dat]] - [[tools-dat]] - [[fab-workspace-dat]]
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+
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+
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+
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+
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+
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+# oscilloscope-dat
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+
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+
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+
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+
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+arduino oscilloscope
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+https://dbuezas.github.io/arduino-web-oscilloscope/
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+
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+wave of UARTS Data
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+
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+- 196678365
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+
47
+![](02-58-18-07-03-2023.png)
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+
49
+
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+## spectrum analyzer
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+
52
+[Spectrum Analyzer](https://academo.org/demos/virtual-oscilloscope/)
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+
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+## Selection
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+
56
+$299 12bit == https://youtu.be/3hyp0-0ns9U?t=680
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+
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+
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+
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+
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+## ref
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+
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+- [[fab-tools-dat]]
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\ No newline at end of file
power-dat/voltage-dat/voltage-dat.md
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-
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-# voltage-dat
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-
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-
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-
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-
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-- [[voltage-dat]] - [[voltage-interverter-dat]] - [[voltage-divider-dat]] - [[voltage-reference-dat]]
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-
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-- [[voltage-level-dat]]
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-
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-
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-- [[voltage-low-alarm-dat]] - [[voltage-dat]]
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-
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-
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-
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-## voltage negative
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-
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-- [[Oscilloscope-dat]]
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-
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-- [[ICI7660-dat]]
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-
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-![](2026-02-12-15-17-57.png)
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-
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-
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-
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-
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-## ref
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-
1
+
2
+# voltage-dat
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+
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+
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+
6
+
7
+- [[voltage-dat]] - [[voltage-interverter-dat]] - [[voltage-divider-dat]] - [[voltage-reference-dat]]
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+
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+- [[voltage-level-dat]]
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+
11
+
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+- [[voltage-low-alarm-dat]] - [[voltage-dat]]
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+
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+
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+
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+## voltage negative
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+
18
+- [[oscilloscope-dat]]
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+
20
+- [[ICI7660-dat]]
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+
22
+![](2026-02-12-15-17-57.png)
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+
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+
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+
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+
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+## ref
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+