Hearing Aid Kit Audio Amplifier Loudspeaker Training Teaching Competition Electronic DIY Interest Production Parts

Get Hearing Aid Kit Audio Amplifier Loudspeaker Training Teaching Competition Electronic DIY Interest Production Parts

Description:

Voltage: 3V
Audio output: 3.5M audio jack headset
PCB outline size: 45 * 30mm
The hearing aid kit consists of a microphone, a front low-amplifier, a power amplifier circuit, and a headphone jack. It has the characteristics of high sound receiving sensitivity, is practical for people with hearing impairment, and is simple to produce and low in cost. This kit is also an ideal training kit for learning analog circuits.

Use suggestions:

After plugging in the earphones, there may be screams when you first turn on the power. Do not put them in your ears first. At this time, adjust the potentiometer to the position that does not scream, and then put them in your ears to adjust until the sound is clear.

Package included:

1 x Hearing Aid Kit

Hearing Aid Kit Audio Amplifier Loudspeaker Training Teaching Competition Electronic DIY Interest Production Parts See detail

TTGO 0.96 Inch ESP32 V2.0 OLED WiFi Module + Bluetooth Double ESP-32 et OLED 4 MB For Arduino

Get TTGO 0.96 Inch ESP32 V2.0 OLED WiFi Module + Bluetooth Double ESP-32 et OLED 4 MB For Arduino Features: 1. Main control chip uses ESP32, Tensilica dual core processor, clocked at 240 MHz, computing capacity of up to 600 DMIPS, 520 SRAM, 802.11 KB chip b/g/n HT40 Wi-Fi transceiver, baseband, and LWIP protocol stack, Bluetooth (Bluetooth dual-mode integrated traditional and BLE low-power Bluetooth) 2. Onboard 4 M bytes (32 M bit) , flash, and Wi-Fi antennas 3. 0.96-inch White OLED display 4. Lithium battery charging circuit and interface 5. CP2102 USB to serial chip, perfect support for Arduino development Package includes: 1 x ESP32 OLED V2.0 1 x line 2 x pin TTGO 0.96 Inch ESP32 V2.0 OLED WiFi Module + Bluetooth Double ESP-32 et OLED 4 MB For Arduino See detail

No-hole Sensor Cabinet Lock Electronic Hidden Home Furniture Door Drawers Lock

Get No-hole Sensor Cabinet Lock Electronic Hidden Home Furniture Door Drawers Lock Features: ● It is suitable only for a wooden door, especially for a drawer, locker, cabinet, sliding door. ● No need to drill holes, no damage to your cabinet. ● Auto return and auto lock function, easy operation. ● Stainless steel latch and ABS plastic case, durable and anti-corrosion. Specifications: - Material: stainless steel - Type: 1 key/2keys - Lock case material: ABS plastic - Accept the thickness of the cabinet door or wardorbe: within 50 mm. - Only suitable for wooden door - Power supply: 4x AA batteries. Package Included: 1 x No-hole Cabinet Lock 1 x Key(1 key/2keys optional) 1 Set Accessory Details Pictures: No-hole Sensor Cabinet Lock Electronic Hidden Home Furniture Door Drawers Lock See detail

433MHz AC 220V 2 Channel Wireless Remote Control Switch Module AK-RK02S-220B+AK-1000-3F Remote Control Transmitter

Get 433MHz AC 220V 2 Channel Wireless Remote Control Switch Module AK-RK02S-220B+AK-1000-3F Remote Control Transmitter Features: 220V 2 channel learning code remote control switch adopts 10A relay, which can load large power electrical appliances; learning MCU decodes and can learn multiple remote controllers; simple and flexible operation; output mode can be switched by short connection reserved solder pad, and point, self-lock and interlock can be selected and used arbitrarily, which is suitable for many applications in many fields; reserved data bit output adjustment port, can be used. By choosing the corresponding key position value of remote control in different positions, it is convenient for customers to match all kinds of remote control they like, and avoids the embarrassment of the old fixed key position matching only a single style remote control. Output without voltage, easy to install. Specification: Operating Voltage: AC220V W...

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