Volume limiter

Volume limiter

IC1 is connected as an inverting amplifier, whose gain is controlled by the LDR (photoresistor) part of the optocoupler,

Using carbon fiber fabrics designed especially for the Carbon Crystal Panel Heater, the Panel heaters generate long-wave infrared radiation directly. Unlike convection heating methods, such as radiators or fan heaters, the infrared Panel Heater do not use air to transfer . the heat, instead the rays turn into heat wherever they meet an object or mass, such as a wall or the floor.

So Carbon Crystal Panel heater is quiet.

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Carbon Crystal Panel Heater

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Fenry manufacturing Co., Ltd , https://www.cnfenry.com