FM 라디오 송신기

주파수 조정이 디지털로 가능한 송신기입니다. 마이크도 붙어 있습니다.

PLL 76.0-108.0MHZ FM Stereo Transmitter Module

1. Product Introduction:

1. Output Power:100mW

2. Audio Frequency Response Range:50Hz-18KHz

3. Transmission Frequency:87.0MHz-108.0MHz (campus broadcast power off);76.0MHz-108.0MHz (campus broadcast power on)

4. Frequency Adjustment Stepping:0.1MHz/times (short press the key);1.0MHz/times (long press the key)

5. Modulation Mode:standard FM

6. Sound Track:LINE/USB channel (stereo);MIC channel (single channel)

7. Equivalent Noise:>=30dB

8. Power Supply Voltage:DC 3.0V-5.0V

9. Operating Current:35mA

10. Adaptive Antenna:75cm bar antenna

2. Application:

1. FM Wireless Frequency

2. USB PC Audio Broadcast

3. Wireless Microphone

4. Maternal And Infants Custody

3. Instruction:

1. Power supply

The corresponding port of the module “-“, “+” respectively connects the power (battery) negative pole and the positive pole. The power supply is recommended for battery or other stabilized power supply.Do not use an unfiltered power supply (such as a mobile phone charger and other low-quality switching power supply), otherwise the interference of the power supply will affect the normal work of the module.The normal working voltage of this module is 3.0-5.0V, and the power supply voltage should not exceed this range.

2. Buttons

Volume +/- : short press volume +/- 1, long press continuous +/-.

Frequency +/- : short press frequency +/ -0.1mhz, long according to continuous +/ -1mhz.

Mute: short press to switch mute/non-mute.

3. Antenna

The ANT port is used to connect the FM antenna. In order to better transmit the FM signal, it is recommended to extend the antenna with a length of 75cm. And the antenna is near as far as possible without obstruction.

4. USB audio connection

If you want to start the USB audio broadcast function of this module, you need to connect the USB cable to the computer. USB port is compatible with common cell phone, so you can use the USB cable to connect the module and computer. Because computer USB comes with 5V output, USB connection can be used to supply power to the module directly. After connecting to the computer USB, the module will automatically enter the PC audio broadcast mode, the LCD screen will display the PC, the computer terminal will install the driver automatically, and the module will be named “CD002” sound card device. Enable this “CD002” audio device in the computer voice Settings. Computer system audio can be transmitted through this module by FM. When the radio frequency is adjusted to the frequency of this module, the audio of the computer terminal system will be heard.

5. LINE audio connection

If you need this module LINE (line in) channel as a source of sound emission, please insert one end of the audio LINE into 3.5 mm audio jack of the module , insert the other end into your audio device (such as mobile phone headset hole), the module automatically switch to the launch of the audio source LINE channel as FM. The nearby FM radio can be heard from the mobile phone as long as it is tuned to the same frequency as the module.

6. FM wireless microphone

If you need MIC of this module to launch, pull out LINE and USB cable (LINE and USB are not connected). The module is automatically transferred to the MIC channel as the transmitting audio source of FM. This module is equipped with a high sensitivity electret microphone, which can be used in wireless microphone, mother-baby monitoring and so on. Note to adjust the volume of this module to achieve the optimum sound pickup effect when used.

7. Serial port control (please ignore this part without serial port control)

The module reserved TTL level serial port control interface.When TTL serial port communicates with this module, it needs to connect the module’s UART_RX, UART_TX and GND.You can use the external MCU or the computer serial port to send instructions control module related functions.

Note: The computer serial port is not TTL level. When connecting to the computer communication, it is necessary to connect the RS323 level to the TTL power leveling device or to use the USB TTL level serial port module to communicate with the module. Serial command control module requires certain computer expertise, if you don’t understand, please don’t try.

4. User-defined Settings:

1. Setting of backlight LED mode

When the power is off, press the “FRE-” and “FRE+” button at the same time to start up. B1 indicates always bright. B0 indicates that the backlight is closed for 20 seconds, and the reset setting takes effect. (the factory defaults to 20 seconds of backlight delay).

2. Start/close the campus radio frequency band

When the power is off, press VOL+,VOL- key, and power on.LCD display C1, which means to start the campus broadcast.C0 means closing the campus radio frequency band.Set to take effect after restart. (the factory defaults to closing the campus radio frequency band).

3. Settings of stereo/mono transmission mode

The back of the module has two solder joints M,G. Short connecting is the monophonic launch. Disconnecting these two points is the stereo system launch. (the

factory defaults to stereo system launch).

Note: the stereo system must satisfy the input to the module’s audio source is stereo and the radio is also stereo to achieve the stereo effect. When using a single speaker (monophonic) radio or input to the module’s audio signal as mono, there is no stereo.

5. Using attention:

1. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module.

2. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.

6. User Settings (please refer to the above) :

This module can set the backlight state and whether to listen to the campus radio frequency band according to the user’s specific usage.

FM 라디오 수신기

전원과 안테나만 연결하면 다른 모듈 필요없이 이어폰으로 FM 라디오 들을 수 있습니다.

1. Introduction

This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.

2. Parameter

NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume,
60mA at minimum volume (for reference only) 7 Sound track Stereo

3. Using attention:

1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module.

2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.

4. Feature

1. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation.

2. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference.

3. 30 digital volume adjustment, with buttons, easy to operate.

4. Automatically storage data before power off.

5. Automatic switch of speaker/headphone output.

6. Quartz crystal steady frequency, temperature change reception frequency, no longer drift.

7. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal.

8. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle.

9 Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.

5. Instruction

1. Power supply

Module corresponding port (marked on PCB board).

“-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current.

2. Antenna

The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm.

3. Headset/speaker output

This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically.

4. Volume

Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series.

5. Frequency regulation

Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch.

6. Mute

Press the VOL knob to switch the mute/non-mute button down.

7. AMCAP switch

Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP.

8. AMCAP threshold adjustment( when the AMCAP switch on)

Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa.

9. Serial port (without serial port control)

The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module’s UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals.

10. User Settings

This module can set the backlight state according to the user’s specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds.

11. Stereo /mono switch terminal.

Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.

6. FM with squelch receiver module AT instruction:

Baud rate: 38400 TTL level

NONameExampleInstructionRangeReturn position
1Set current frequency pointAT+FRE=875current frequency point is 87.5MHz870-1080 MHzCurrent frequency point/ERR
2Frequency point-0.1MHZAT+FRED  Current frequency point
3Frequency point+0.1MHZAT+FREU  Current frequency point
4Pause paly/Contiune playAT+PAUS  PLAY/PAUS/ERR
5Set volumeAT+VOL=15Current volume is 1500-30VOL value/ERR
8Set backlight time(S). 00 means light off; 01 means normally onAT+BANK=10Backlight is 10s light off00-99BANK value/ERR
9Turn on and off DSP squelchAT+SN=1Turn on squelch0(off) -1(on)SN_OFF/ SN_ON
10Set squelch thresholdAT+SN_THR=10Set squelch threshold is 1000-20SN_THR value/ERR
(Set it when SN _ON)
11Factory data resetAT+CRFactory data reset:
1:VOL=30 //
2:SN_OFF // Turn off DSP squelch 3:SNTHR =10 // reset squelch threshold is 10
4:FRE=875 // Frequency is 87.5MHZ BANK=20// Backlight delay 20s
12Returns the current state of the moduleAT+RET  VOL=10 // volume 10.
FRE=875 // the frequency is 87.5MHZ.
PLAY/PAUS// static state.
(BANK_ON) // backlight time (1 normally open, 0 constant, or delay X s)

12 LED Piranha 보드

천원 정도에 12개의 LED가 붙어있는 모듈입니다. Piranha LED라서 굉장히 밝아요. 눈부심 주의!!!

Input voltage: DC 3.5-5.5V (Recommended 5V DC)
Operating current: about 200MA
Power: about 1W

Dual USB 18650 파워뱅크 충전 모듈

  • Motherboard comes with protection function:
    Overcharge protection
    Over-discharge protection
    Overcurrent protection
  • Specifications:
    Micro USB input: 5V 1A
    USB Output: 5V 2.1A / 5V 1A(Dual USB interface)
    Charging display: intelligent digital display
    Batteries Type: liquid lithium-ion batteries (18650)
    Product Size: 57mm x 28mm
    Screen size:27mm x 17mm

FM 라디오 수신 모듈

연결해서 사용은 나중에 해야겠네요. 일단 구입 모듈 올립니다.

Reception frequency adjustment range: 87.0MHz-108.0MHz
Equivalent noise: ≥30dB
Supply voltage: 3.0V-5.0V
Current: 40mA

18650 배터리 쉴드

가끔 전원없이 배터리로 작동하는 프로젝트 만들때에 18650배터리를 사용하기 좋게 만들어진 쉴드입니다.

micro USB는 충전용이고 USB A커넥터가 출력입니다. 3V, 5V로 출력이 가능합니다.

하나들어가는 것과 2개 들어가는게 있습니다. 2개짜리는 좀 오래가겠네요.

LCR-TC1 테스터

저항이나 기타 부품 측정용으로 구입한 제품입니다. 배터리가 조루라서 나중에 교체 해야겠네요.

배터리와 캐퍼시터는 아래 주의 사항처럼 측정할때 주의가 필요합니다.
배터리는 아예 하지 않는게 좋겠네요. 캐퍼시터는 꼭 방전 후 측정입니다.

  • Specifications:

Display: 160*128 TFT Screen
Diode Range: < 4.5V
Zener Diode:Transistor Detect Area: 0.01-4.5V
Zener Diode Detect Area: 0.01-30V
Triac Range: IGT < 6mA
Capacitance: 25pF-100mF
Resistor: 0.01-50MΩ
Inductance: 0.01mH-20H
Battery: 0.1-4.5V
Power Mode: Rechargeable Lithium Battery ( 3.7V, 350mAh)
Item Size: 8.8 x 8 x 2.8cm
Item Weight: 111.5g

Warning: Always be sure to DISCHARGE capacitors before connecting them to the tester! The tester may be damaged before you have switched it on!
Warning: We do not recommend using the tester to measure the battery! The battery voltage must be less than 4.5V, otherwise the tester may be damaged!

Audio Switch Board DIY

오디오 잭의 변환을 도와주는 DIY 킷입니다.

Input이 아래의 2개이고 Output은 위쪽에 2개입니다.