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Remote Control Blocker Schematic Circuit Diagram

Signal Blocking Purpose

This circuit was specifically crafted to block signals emitted by infrared remote control, offering a practical solution for situations where unwanted channel switching is a concern, especially with children. It also proves effective when television usage is restricted as a form of punishment. By putting the TV on standby and rendering the remote control inoperative, parental control can be easily maintained.

Simple Disruption Mechanism

The operation of this device is remarkably simple. It employs two infrared (IR) LEDs that continuously emit infrared light within a customizable frequency range, typically set between 32 and 41 kHz. Since most remote controls operate at frequencies of 36 kHz or 38 kHz, this setup effectively disrupts their signals. The interference with the remote control happens due to the interaction with the ‘automatic gain’ feature found in IR receivers of devices like TVs, CD players, and home cinema systems. The strong signal from the IR LEDs triggers a reduction in receiver gain, rendering the remote control ineffective.

Remote Control Blocker Schematic Circuit Diagram

Effective Remote Control Blocking

In this circuit, the IR signals from a remote control are deliberately weakened to a point where they cannot be detected by the receiver, rendering the equipment blind to the remote control’s commands. Achieving this disruption involves the utilization of an oscillator based on the standard NE555 chip. This oscillator drives a buffer stage, supplying the necessary current to power two infrared LEDs. The setup process for this circuit is straightforward: align the IR LEDs with the device targeted for remote control blocking. Then, test the remote control; if it still functions, adjust the circuit’s frequency until the remote control becomes non-responsive. It’s crucial to note that this circuit exclusively works against remote controls utilizing infrared (IR) light signals.

Invisible Infrared Light

IR LEDs, or infrared light-emitting diodes, are solid-state lighting devices emitting light within the infrared range of the electromagnetic spectrum. Emitting light in the 700 nm to 1mm range, these LEDs operate invisibly to the naked eye. While the light they produce is not visible, it can be detected using a digital camera, where the LED appears as a distinctive purple glow on the camera screen when activated by pressing a button on the remote control.


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