Subwoofers are increasingly showing their importance in modern audio production and home theaters, and new devices and circuits are emerging one after another. Several circuits introduced to you here have better performance, are easier to manufacture, and have a certain representative circuit.
1. Dynamic subwoofer circuit
The STDTD circuit is shown in Figure 9-36. This is an improved Aiwa XBS circuit. Connect it to both ends of the volume potentiometer of the amplifier. The bass increase varies with the volume. For the bass below 85HZ, there is an improvement of 15 ~ 20DB. The basic circuit and access method are: disconnect the signal line at the upper end of the original volume-increasing potentiometer, and connect it to the IN end of this circuit, so that the pre-level signal will be all the way through AL After the frequency signal is buffered, it is sent back to the upper end of the original potentiometer WH. After the other way passes through the Butterworth filter composed of A2 and peripheral components, the bass signal is amplified by A3 and output to the center tap WO of the original potentiometer to change the R
Mini Cool Mist Usb Air Humidifier
Mini Humidifier is a vase shaped humidifier with lightweight and compact design. With ultrasonic technology, it envelops your surroundings effectively by producing cool mist to add moisture and relieve stress. Suitable for your car, office, bedroom, study room, dining room, children's room and more.
Features
- Mini Cool Mist Humidifier: Designed with high-frequency atomizer plate. It adopts ultrasonic technology to oscillate and decompose water into fine nano-class cool mist molecules, which can quickly penetrate the underlying skin and relieve dry skin.
- User-friendly Design: Lightweight and compact, this Mini Air Humidifier can hold up to 80ml of water and produce up to 25ml of moisture per hour. Both the main engine and water cup are detachable, easy to clean and use.
- Whisper-quiet: Ultra-stable atomizer plate provides gentle and stable mist, creating a quiet and relaxing environment (less than 35dB). Low consumption and low noise make it perfect for sleeping or reading time. Work quietly without producing any bothering noises.
- Safe and Reliable: With the built-in water level sensor, Mini Usb Humidifier will automatically power off when the water level is lower than the safe water level. Compatible with any USB power source (AC power adapters, car chargers, laptops/computers, or power banks), universal and convenient. Safe with a 5V low voltage input.
Mini Humidifier
Mini Humidifier,Mini Usb Humidifier,Mini Air Humidifier,Mini Cool Mist Humidifier
Shenzhen Dituo Electronic Co.,Ltd. , https://www.sz-dituo.com