Tech-dat/Network-dat/fiber-optic-dat/Photolink-dat/2025-04-21-16-00-21.png
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Tech-dat/Network-dat/fiber-optic-dat/Photolink-dat/Photolink-dat.md
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@@ -21,6 +21,15 @@ https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5335/PLT237-T10WH_R
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| **Package** | Photo-link Connector | Photo-link Connector |
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| **Manufacturer**| Everlight (Likely) | Everlight |
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+
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+Everlight PLT131/T1/12 Photolink Fiber Optic Transmitter 650nm
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+
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+![](2025-04-21-16-00-21.png)
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+
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+PLR135/T8
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+
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+
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+
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## ref
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- [[fiber-optic-dat]]
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\ No newline at end of file
Tech-dat/Network-dat/fiber-optic-dat/fiber-optic-app-dat/fiber-optic-app-dat.md
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@@ -15,6 +15,8 @@ FPV remote communication
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![](2025-03-28-17-48-29.png)
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+- [demo video how it works](https://www.youtube.com/shorts/GSPIDlSw020)
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+
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emergancy support
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![](2025-03-28-17-42-03.png)
Tech-dat/Network-dat/fiber-optic-dat/fiber-optic-cable-dat/fiber-optic-cable-dat.md
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@@ -5,4 +5,10 @@
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- [[POF-dat]]
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-![](2025-04-21-15-53-41.png)
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\ No newline at end of file
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+![](2025-04-21-15-53-41.png)
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+
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+
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+
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+## cable assembly
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+
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+- [cable assembly, looks complex ](https://www.youtube.com/shorts/w1MxLufzwF4)
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\ No newline at end of file
Tech-dat/power-dat/battery-dat/battery-dat.md
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@@ -2,13 +2,11 @@
2 2
3 3
# battery-dat
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5
-- [[rechargeable-battery-dat/rechargerable-battery-dat]]
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+- [[rechargerable-battery-dat]] - [[lithium-battery-dat]] - [[lead-acid-battery-dat]]
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- [[battery-holder-dat]]
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-- [[alkaline-battery-dat]] - [[lithium-ion-battery-dat]]
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-
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-- [[lithium-battery-dat]]
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+- [[alkaline-battery-dat]]
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13 11
## coin battery dat
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Tech-dat/power-dat/battery-dat/rechargerable-battery-dat/Lead-acid-battery-dat/2025-04-21-16-25-17.png
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Tech-dat/power-dat/battery-dat/rechargerable-battery-dat/Lead-acid-battery-dat/Lead-acid-battery-dat.md
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@@ -3,6 +3,7 @@
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## lead-acid-battery-dat
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+- LAB: Lead-Acid Battery
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- 蓄电池 (xù diàn chí) is the Chinese term for "rechargeable battery." It is a type of electrical battery that can be recharged multiple times. It is commonly used in various electronic devices such as mobile phones, laptops, electric vehicles, and many other portable devices.
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- Here are some links where you can find more information about 蓄电池:
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@@ -16,7 +17,63 @@
16 17
- 12V == [[solar-power-dat]]
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- 72V == [[motor-dat]]
18 19
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+## LAB Example
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+![](2025-04-21-16-25-17.png)
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+
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+* **Brand:** ANJING
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+* **Type:** Sealed Rechargeable Battery (Likely SLA/VRLA) Sealed Lead-Acid (a specific type, but often used generally)
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+* **Nominal Voltage:** 12V
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+* **Capacity:** 2.6Ah (Rated at 20-hour discharge rate - 12V 2.6Ah/20hr)
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+ * This implies a discharge current of 0.13A (2.6Ah / 20h) for 20 hours.
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+* **Charging Method:** Constant Voltage Charge
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+ * **Standby Use (Float):** 13.50V - 13.80V
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+ * **Cycle Use:** 14.40V - 15.00V
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+ * **Initial Charging Current:** Less than 0.78A (0.3C)
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+* **Chemistry:** Lead-acid (Pb symbol present)
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+* **Markings:**
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+ * Recycling symbol
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+ * Do not dispose symbol (crossed-out bin)
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+
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+As noted on the battery (12V2.6Ah/20hr), this specific 2.6Ah rating was determined using a 20-hour discharge period. This means it was likely discharged at a current of 0.13A (2.6Ah / 20h = 0.13A) for 20 hours.
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+
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+
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+### Estimated Runtime Calculation
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+
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+This calculation estimates how long the ANJING 12V 2.6Ah battery can power a 5V 1A load using a DC-DC converter.
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+
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+**1. Calculate Load Power:**
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+ - Load Voltage (V_load) = 5V
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+ - Load Current (I_load) = 1A
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+ - Load Power (P_load) = V_load × I_load = 5V × 1A = 5 Watts
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+
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+**2. Account for DC-DC Converter Efficiency:**
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+ - Assume a typical converter efficiency (η) = 85% (or 0.85). Real-world efficiency may vary.
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+ - Power drawn from the battery (P_batt) = P_load / η
53
+ - P_batt = 5W / 0.85 ≈ 5.88 Watts
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+
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+**3. Calculate Current Drawn from Battery:**
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+ - Battery Nominal Voltage (V_batt) = 12V
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+ - Current drawn from battery (I_batt) = P_batt / V_batt
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+ - I_batt = 5.88W / 12V ≈ 0.49 Amps
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+
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+**4. Compare to Rated Discharge:**
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+ - The battery's capacity (2.6Ah) is rated for a 20-hour discharge (as noted in the file: `12V2.6Ah/20hr`).
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+ - Rated Discharge Current (I_rated) = 2.6Ah / 20h = 0.13 Amps
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+ - The calculated draw (0.49A) is significantly higher than the rated discharge current (0.13A).
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+
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+**5. Calculate Ideal Runtime (Ignoring Peukert's Effect):**
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+ - Battery Capacity (C) = 2.6Ah
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+ - Ideal Runtime (T_ideal) = C / I_batt
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+ - T_ideal = 2.6Ah / 0.49A ≈ 5.3 hours
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+
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+**6. Consider Peukert's Effect:**
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+ - Lead-acid batteries deliver less total capacity when discharged at rates higher than their rating (Peukert's Law).
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+ - Since 0.49A is much higher than the 0.13A rating, the *effective* capacity will be lower than 2.6Ah.
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+
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+**Conclusion:**
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+
76
+The **ideal calculated runtime is approximately 5.3 hours**. However, due to the higher discharge current (0.49A vs. the 0.13A rating), the actual runtime will be **noticeably less than 5.3 hours**. The exact reduction depends on the specific Peukert exponent of this battery model, which is not provided.
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## ref
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Tech-dat/power-dat/battery-dat/rechargerable-battery-dat/lithium-battery-dat/portable-power-bank-dat/portable-power-bank-dat.md
... ...
@@ -0,0 +1,36 @@
1
+
2
+# portable-power-bank-dat
3
+
4
+### How Power Bank Capacity (e.g., 20000 mAh) is Calculated
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+
6
+The capacity advertised on a power bank, such as 20000 mAh, typically represents the **total combined capacity of its internal battery cells**. Here's the breakdown:
7
+
8
+1. **Internal Battery Cells:**
9
+ * Power banks contain one or more individual battery cells, usually Lithium-ion (Li-ion) or Lithium-polymer (Li-Po).
10
+
11
+2. **Individual Cell Capacity:**
12
+ * Each internal cell has its own capacity rating, measured in milliampere-hours (mAh). Examples include 2500mAh, 3350mAh, 5000mAh per cell.
13
+
14
+3. **Parallel Connection:**
15
+ * To achieve a higher total capacity, these individual cells are connected **in parallel** inside the power bank.
16
+ * In a parallel circuit, the total capacity is the sum of the individual capacities.
17
+
18
+4. **Calculation Example:**
19
+ * A 20000 mAh power bank might be constructed using:
20
+ * 4 cells × 5000 mAh/cell = `20000 mAh`
21
+ * 6 cells × ~3350 mAh/cell ≈ `20100 mAh` (often rounded down or marketed as 20000 mAh)
22
+ * 8 cells × 2500 mAh/cell = `20000 mAh`
23
+
24
+**Key Considerations:**
25
+
26
+* **Cell Voltage:** This advertised capacity (e.g., 20000 mAh) is based on the **nominal voltage of the internal cells** (typically 3.6V or 3.7V).
27
+* **Output Voltage & Efficiency:** When charging a device, the power bank converts the internal cell voltage to the required output voltage (e.g., 5V, 9V, 12V via USB). This conversion process isn't 100% efficient; some energy is lost as heat.
28
+* **Rated Capacity:** Because of the voltage conversion and efficiency losses, the actual amount of charge delivered *to your device* at the output voltage will be lower than the internal cell capacity. This usable output is often listed separately as the **Rated Capacity** (e.g., "Rated Capacity: 12500mAh at 5V").
29
+
30
+
31
+## ref
32
+
33
+
34
+- [[injoinic-dat]] - [[IP5306-dat]] - [[IP5316-dat]]
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+
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+