[Photo] Audio Control and Soft Switching Amplifier

The soft switching is enabled by a BD131 transistor wired as a switch in emitter follower configuraTIon. The collector is wired to a permanent supply voltage, the 2H series inductor serves only to filter out power supply hum. This inductor is not too important and may be omitted if the DC supply is adequately smoothed. The control voltage is applied to the BD131 base terminal, the 10u capacitor and 10k resistor having a dual purpose:-
i) a gradual charge of the 10u capacitor ensures that the transistor will switch linearly from 0 volts to full supply, and
ii) serves as a hum filter ensuring a very smooth dc supply to the amplifier and tone controls.
LED1 will light when the amplifier is on. The control voltage should ideally be 0 volts when the amplifier is off and full supply voltage when on. The LM380 is shown driving two 8 ohm loupspeakers, the load is therefore 4 ohms. The 4u7 capacitor acts as a crude crossover, lower frequencies are impeded and so this loudspeaker may be a "tweeter" type.

The world premiere of the technical zone! ROHM has developed the power supply IC "BD372xx series" for high-quality audio. A practical guide for the purchase of home wireless routers. Understanding the circuit diagram and working principle of the audio. Talking about the "frequency response curve" in the audio. Deep dismantling report of the M0pro speaker: both internal and external

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Electric Tea Kettle:

 

Quickly brew the perfect cup of tea or make pour over coffee right at the table with the Electric Tea Kettle. With 1500 watts, this Electric Kettle boils water faster than a microwave, and is safer to use than a stovetop kettle because it automatically turns off when the water reaches a boil. Serving at the table is no problem as the kettle lifts off the base without the cord. Additional features include two water level windows and a pull-lid to make filling and serving easy. 

 

Features:

  •  Thermostat Control – Having a thermostat control allows the kettle to [know" when to shut off. This will prevent damage to the heating element and is an important feature in all modern styles.
  •   Auto shut off/Boil Dry Protection/Fuse â€“ these are three features that are great for protecting the safety of users as well as extending the life of the electric kettle.  The fuse and boil dry protection shut the kettle off if the water gets down below a certain level or if it`s left on for an extended period of time, It doesn`t burn up the kettle.
  • Colors and Designs â€“ Electric kettles come in all shapes, sizes and colors. Finding one that will fit with the kitchen design is actually pretty easy.  Finding one that matches and that has the features you`re looking for can be a bit harder, but with all the choices available and the newer models on the market today, you will be able to find the perfect electric kettle for your kitchen.
  • Savety in Electric- the heating element is typically fully enclosed, with a power rating of 2–3 kW at 220V. In countries with 110V mains electricity, kettles may be less powerful (1–1.5 kW) to avoid drawing too much current and requiring a very thick supply wire.

Application:

Heat the tea thoroughly

Bottle the water/beer

Boil water

Electric Tea Kettle

Electric Tea Kettle,Stainless Steel Electric Tea Kettle,Cordless Electric Tea Kettle,Electric Cordless Glass Tea Kettle

Guangzhou Taipeng Electrical Appliances Technology CO., LTD. , https://www.kettles.pl