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"This project, Relay-1, is a PCB sub-layout that demonstrates the design and implementation of a simple relay driver. The design features a relay activation circuit along with the necessary supporting components, making it a modular building block for larger relay control systems. It serves as both a learning tool and a practical component in relay-based switching applications."
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1y
This project appears to be a schematic design for a relay control circuit incorporating various electronic components. It is structured around a simple relay represented by U1, a Songle SRD-05VDC-SL-C relay, to switch a load on or off. Here's a breakdown of its components and their functions within the circuit:
Components and Their Roles:
  • U1 (Relay SRD-05VDC-SL-C by Songle): Acts as the main switch, controlling the connection between the load (likely connected to pins not shown in the text) and a power source or signal.
  • Q1 (BCP51 Transistor by Fairchild Semiconductor): A bipolar junction transistor operating as a switch or amplifier to control the relay coil based on the input signal to its base $B$.
  • R1, R3, R4 (10k Resistors): Serve as pull-up or pull-down resistors to establish a known state on the inputs/outputs they're connected to, or to limit current to protect other components.
  • R2 (100 Ohm Resistor): Likely used for current limiting, possibly in the base circuit of the transistor Q1 to control its switching operation.
  • C1 (10u Capacitor): Provides noise suppression or power supply decoupling, which smooths out voltage ripples and provides a stable voltage supply to the relay or other components.
  • D1 (Diode): Typically used for protecting the circuit from reverse voltage spikes generated when the relay coil is de-energized. It is placed across the relay coil in reverse bias to safely dissipate these voltages.
  • U3 (VOM617A-6T by Vishay): Appears to be an optocoupler or similar component, likely providing electrical isolation between the input signal and the relay control circuit. It ensures that no electrical disturbances from the relay side affect the signal side.
  • J1 (Connector): Functions as a point of interface for external connections, possibly for input signals or to connect the load.
  • OUT, VCC, GND (Pin Designators): These pins represent the output, supply voltage, and ground connections, respectively, essential for powering the circuit and providing reference voltages.
Circuit Functionality Overview:
  1. Signal Input: The circuit likely receives an input signal through J1:P1 or another interface not explicitly described. This signal could control the optocoupler U3, which then influences the transistor Q1's operation.
  2. Transistor Switching: Q1 acts as a switch. When activated by the signal through its base (potentially moderated by R2), it allows current to flow from its collector $C$ to emitter $E$, enabling the relay U1.
  3. Relay Activation: When the transistor allows current through, the relay coil in U1 gets energized, causing the relay to switch states—either making or breaking a connection in another part of the circuit, controlling a load.
  4. Protection and Filtering: D1 protects against voltage spikes from the relay deactivation. C1 filters noise from the power supply or across the relay coil. R1, R3, and R4 ensure proper voltage levels are presented at their respective points in the circuit.
  5. Output: The load controlled by the relay would be connected to OUT, although specific details of the load connection are not provided.
This project highlights the design of a relay control circuit, incorporating isolation (via U3), switching (via Q1 and U1), signal integrity (via R1, R3, R4, and C1), and protection aspects (via D1).
1y
Someone is typing...
R1
Resistance
10k Ω
R2
Resistance
100 Ω
R3
Resistance
10k Ω
C1
Capacitance
10u F
Q1
U3


  • Ground
    A common return path for electric current. Commonly known as ground.
  • Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
  • Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
  • Generic Resistor
    A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
  • Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
  • Generic Inductor
    A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
  • RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
  • 875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
  • CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink

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Relay-1

Relay-1
Description

Created
Last updated by jharwinbarrozo
2 Contributor(s)
vasyl
jharwinbarrozo

Controls

Properties

Designator Prefix
RL

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