BOM-DAT/Resistor-Dat/burden-resistor-dat/burden-resistor-dat.md
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-# burden-resistor-dat
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-
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-A burden resistor is a component used with current transformers (CTs). - [[current-transformer-dat]]
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-
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-- used by [[SVC1035-dat]] and [[SVC1038-dat]] == 100K 2512
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-
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-
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-
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-## Purpose:
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-
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-**Convert Current to Voltage**: The primary function of a burden resistor is to convert the current output of a current transformer into a voltage signal. CTs are designed to produce a current in their secondary winding that is proportional to the current in their primary winding.
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-
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-Many measurement circuits (like analog-to-digital converters in microcontrollers) are designed to read voltage, not current directly.
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-
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-The burden resistor, when placed across the secondary winding of the CT, allows this current to develop a voltage across it (V = I * R).
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-
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-**Provide a Load**: It provides a necessary load for the current transformer. Operating a CT without a burden (i.e., with an open-circuited secondary) can lead to dangerously high voltages across the secondary terminals, potentially damaging the CT or posing a safety hazard.
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-Selection:
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-
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-The value of the burden resistor is chosen based on the CT's characteristics (like its turns ratio and maximum secondary current) and the desired output voltage range for the measurement circuitry.
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-
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-It's important **not to choose a burden resistor value that is too high**, as this can lead to saturation of the CT core, causing inaccurate readings.
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-
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-
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-In summary, a burden resistor is crucial for safely and accurately measuring current using a current transformer by converting its current output to a measurable voltage and providing a safe operating load.
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-
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-
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-## ref
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-
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-- [[resistor-dat]]
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BOM-DAT/Resistor-Dat/resistor-burden-dat/resistor-burden-dat.md
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+# burden-resistor-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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+A burden resistor is a component used with current transformers (CTs). - [[current-transformer-dat]]
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+
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+- used by [[SVC1035-dat]] and [[SVC1038-dat]] == 100K 2512
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+
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+
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+
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+## Purpose:
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+
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+**Convert Current to Voltage**: The primary function of a burden resistor is to convert the current output of a current transformer into a voltage signal. CTs are designed to produce a current in their secondary winding that is proportional to the current in their primary winding.
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+
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+Many measurement circuits (like analog-to-digital converters in microcontrollers) are designed to read voltage, not current directly.
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+
20
+The burden resistor, when placed across the secondary winding of the CT, allows this current to develop a voltage across it (V = I * R).
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+
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+**Provide a Load**: It provides a necessary load for the current transformer. Operating a CT without a burden (i.e., with an open-circuited secondary) can lead to dangerously high voltages across the secondary terminals, potentially damaging the CT or posing a safety hazard.
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+Selection:
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+
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+The value of the burden resistor is chosen based on the CT's characteristics (like its turns ratio and maximum secondary current) and the desired output voltage range for the measurement circuitry.
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+
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+It's important **not to choose a burden resistor value that is too high**, as this can lead to saturation of the CT core, causing inaccurate readings.
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+
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+
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+In summary, a burden resistor is crucial for safely and accurately measuring current using a current transformer by converting its current output to a measurable voltage and providing a safe operating load.
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+
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+
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+
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+
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+
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+# sample-resistor-dat
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+
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+![](2025-05-20-13-40-57.png)
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+
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+![](2025-05-20-13-41-43.png)
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+
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+- footprint 2512
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+
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+![](2025-05-20-13-43-59.png)
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+
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+- [[HLW8032-faq-dat]]
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+
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+- 0.003Ω_3W = The 10A version uses a 0.003Ω (3mΩ) sampling resistor, and its current coefficient is 0.333.
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+- 0.001Ω_3W = The 20A version uses a 0.001Ω (1mΩ) sampling resistor, and its current coefficient is 1.
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+
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+R0003 = 0.3 mR
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+
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+
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+## Manganese-copper resistor
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+
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+![](2025-05-29-14-57-40.png)
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+
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+## Iron-Chromium-Aluminum resistor
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+
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+## 3W / 5W / 7W
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+
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+![](2025-05-29-14-58-40.png)
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+
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+## Testing precision
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+
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+![](2025-05-29-14-59-23.png)
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+
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+
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+## ref
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+
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+- [[resistor-dat]] - [[resistor-sample]] - [[resistor]]
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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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+- [[resistor-dat]]
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BOM-DAT/Resistor-Dat/resistor-load-dat/resistor-load-dat.md
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+# resistor-load-dat.md
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+- [[OPM1073-dat]] - [[resistor-load-dat]]
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+
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+== dummy load
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+
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+RX21-10W 5RJ == 5R
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+
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+![](2026-05-03-18-32-20.png)
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+The **RX21-10W 5RJ** is a high-power wirewound resistor commonly used in industrial circuits, power supplies, and motor control projects where heat dissipation is required.
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+
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+### 1. Breakdown of Part Number
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+
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+| Code | Meaning | Details |
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+| :--- | :--- | :--- |
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+| **RX21** | **Type/Series** | Wirewound resistor with a heat-resistant glaze/enamel coating. |
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+| **10W** | **Power Rating** | Maximum power dissipation of **10 Watts**. |
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+| **5R** | **Resistance** | **5.0 Ω** (Ohms). The "R" represents the decimal point. |
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+| **J** | **Tolerance** | **±5%** precision (actual range: 4.75Ω to 5.25Ω). |
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+
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+### 2. Physical Construction
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+These resistors consist of a resistive wire (often Nichrome) wound around a ceramic core and sealed with a protective coating. This construction allows them to withstand high temperatures and temporary power surges better than carbon film resistors.
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+
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+
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+
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+### 3. Technical Specifications
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+* **Resistance:** 5 Ω
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+* **Power Dissipation:** 10 Watts (Max)
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+* **Tolerance:** ±5%
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+* **Coating:** Typically Green or Grey Silicone/Enamel Glaze
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+* **Mounting:** Axial leads (through-hole)
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+
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+### 4. Application Notes
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+
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+* **Heat Management:** At its full 10W rating, this resistor will become extremely hot (often exceeding 100°C). Ensure it is mounted with adequate clearance from PCBs or plastic enclosures.
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+* **Inductance:** Because it is "wirewound," it has a small amount of inherent inductance. It is ideal for DC or low-frequency AC applications but may not be suitable for high-frequency RF circuits.
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+* **Common Uses:** * Current limiting in LED arrays.
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+ * Inrush current protection.
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+ * Brake resistors for small motors.
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+ * Dummy loads for testing power supplies.
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+
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+
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+## ref
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BOM-DAT/Resistor-Dat/sample-resistor-dat/sample-resistor-dat.md
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-# sample-resistor-dat
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-
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-![](2025-05-20-13-40-57.png)
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-![](2025-05-20-13-41-43.png)
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-- footprint 2512
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-![](2025-05-20-13-43-59.png)
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-- [[HLW8032-faq-dat]]
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-
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-- 0.003Ω_3W = The 10A version uses a 0.003Ω (3mΩ) sampling resistor, and its current coefficient is 0.333.
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-- 0.001Ω_3W = The 20A version uses a 0.001Ω (1mΩ) sampling resistor, and its current coefficient is 1.
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-
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-R0003 = 0.3 mR
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-
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-
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-## Manganese-copper resistor
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-
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-![](2025-05-29-14-57-40.png)
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-
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-## Iron-Chromium-Aluminum resistor
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-
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-## 3W / 5W / 7W
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-
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-![](2025-05-29-14-58-40.png)
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-
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-## Testing precision
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-
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-![](2025-05-29-14-59-23.png)
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-
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-
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-## ref
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-
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-- [[resistor-dat]] - [[resistor-sample]] - [[resistor]]
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--
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Board-dat/OPM/OPM1073-dat/2026-05-03-18-29-44.png
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Board-dat/OPM/OPM1073-dat/OPM1073-dat.md
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# OPM1073-dat
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-**Product Features:**
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+
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+
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+## Info
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+
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+[product url - USB Load Resistor for testing, 2A/1A Constant Discharge](https://www.electrodragon.com/product/usb-load-resistor-for-testing-2a1a-constant-discharge/)
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+
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+
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+
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+### Board Map, Dimension, Pins, chip info, Use Guide, Setup Jumper, etc.
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+
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+- [[resistor-dat]] - [[OPM1073-dat]] - [[resistor-load-dat]]
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+
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+SCH
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+
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+![](2026-05-03-18-29-44.png)
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+
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+## Applications, category, tags, etc.
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+
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+## Demo Code and Video
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+
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+## ref
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+- [[OPM1073]]
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+- legacy wiki page
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+
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+
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+
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+
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+## Product Features:
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1. **Toggle Switch and Dual-Color Indicator Light**: Allows direct switching between 1A and 2A discharge currents. When switched to 1A, the green light is on. When switched to 2A, the red light is on.
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