Two Channel Relay Board

twochannel relay board

2 channel Relay driver project can be controlled by feeding 2-12V trigger voltage, Very useful project for application like Micro-Controller based projects, Remote controller, Lamp on Off, and any circuits which required isolated high current and high voltage switching by applying any TTL or CMOS level voltage. Two LED works as operation indicator while in , 3 pins screw terminals to connect load and provides  both normally open and normally closed switching.

 

 

 

Features

  • Input: 12 VDC @ 84 mA
  • Output: Two SPDT relay
  • Relay specification: 5 A @ 230 VAC
  • Trigger level : 2 to 12 VDC
  • Header connector for connecting power and trigger voltage
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 49 mm x 68 mm

SCH2

Two Channel Relay Board

Light Sensitive Switch Single Transistor Based

Light Sensitive Switch is a simple project which operates a relay when light falls on the LDR.

Input : 12 V @ 55 mA
Relay output : NC-C-NO
Onboard preset to set the level
Power-On LED indicator
Relay On LED indicator
Power Battery Terminal (PBT) for easy relay output connection
Four mounting holes of 3.2 mm each
PCB dimensions 44 mm x 49 mm

SCH2

 

Light Sensitive Switch Schematic

Light Sensitive Switch Schematic

 

Light Sensitive Switch PCB and Parts List

Light Sensitive Switch PCB and Parts List

LED VU Meter 5LEDs CH1403 or LB1403 IC

led-vu-meter-1

5 LED VU Meter project is based on LB1403/CH1403 IC from SANYO, which will indicates the volume level of the audio signal it senses.

Features

 Power supply : 6 to 12 VDC @ 90 mA
Lighting levels remain stable to line regulation because of on-chip voltage reference
LED’s are driven by a constant current
Onboard presets to adjust input sensitivity
Terminal pins for connecting power supply, audio input
Four mounting holes of 3.2 mm each
PCB dimensions 34 mm x 52 mm

led-vu-meter-3

led-vu-meter-2

Tiny Mic Pre-Amplifier

tiny-mic-preamplifier-1

The Tiny Mic Pre-Amplifier project is based on a single transistor.  It amplifies the output of the electret condenser microphone. The project amplify low level signal coming from microphone and then provide sufficient voltage level to drive power audio amplifier. Good choice for Karaoke.

Power supply : 5 ~ 9 VDC @ 2 mA
PCB dimensions 26 mm x 56 mm

tiny-mic-preamplifier-3

tiny-mic-preamplifier-2

 

Mini Stereo Audio Amplifier TDA2822

mini-stereo-audio-amplifier-1

Mini Stereo Audio Amplifier project is designed for portable radio players and other building block projects.  It is based on TDA2822 IC.

Features

 Power supply : Upto 12 VDC
 Output : 1 W, 8 ?  for 12 VDC / 20 mW, 32 ? for 3 VDC
 Input resistance 100 K?
 Low crossover distortion, Low quiescent current
 Berg connector for connecting audio input, power supply and outputs
 Onboard Presets to adjust volume
 Power-On LED indicator
 Four mounting holes of 3.2 mm each
 PCB dimensions 50 mm x 36 mm

mini-stereo-audio-amplifier-2

 

6.5W Stereo Audio Amplifier Based on TDA2004

6-5w_stereo_audio_amp

The 6.5W Stereo Audio Amplifier project built around TDA2004 IC. The TDA2004 is a class B dual audio power amplifier, specifically designed for car radio applications etc.

Specifications

Power supply input 15 VDC
Output power: 2 X 6.5 W, 4 Ohm / 2 X 10 W, 2 Ohm
Short circuit, thermal shut-down, load dump voltage surge protection
Terminal pins for connecting left and right audio signal inputs
Header connector for connecting potentiometer (POT) for volume adjustment
Screw terminal connector for easy supply input and speaker output connection
Power-On LED indicator
Heat-sink for IC
PCB dimensions 67 mm x 73 mm

6-5w_stereo_audio_amp_sch-1024x719 6-5w_stereo_audio_amp_top 6-5w_stereo_audio_amp_bot 6-5w_stereo_audio_amp_bom-825x1024

Small Signal Amplifier (Pre-Amplifier) For Audio Signal

audio-low-signal-amplifier-1

The Stereo small level audio signal amplifier has been developed to amplify the low level stereo audio signal, without changing other parameters of the waveform such as frequency and shape of the signal. This circuit  has been designed to amplify signals in the range of 20Hz to 20 kHz. Circuit amplify the low level signals from microphones, ultra-sonic transducer and other audio signal source. The project amplify low level signal and then provide sufficient voltage level to drive power audio amplifier. Gain of the amplifier can be change by onboard preset. Circuit has preset on output to set the audio signal level.

Features

  • Power supply: 12 – 24 VDC @ 40 mA
  • Gain 50
  • Onboard PRESET to adjust Gain
  • On Board Preset on Output to set the audio level Level
  • Header connector for connecting of input and output
  • Terminal pins for connecting power supply input
  • Power-On LED indicator
  • PCB dimensions 47 mm x 58 mm
  • Four mounting holes of 3.2 mm eactch

 

audio-low-signal-amplifier-4

audio-low-signal-amplifier-3

audio-low-signal-amplifier-1

20W Bridge Audio Amplifier TDA2005

20w_bridge_audio_amp

20W Bridge Audio Amplifier project, based on the TDA2005 IC, The TDA 2005 IC is class B dual audio amplifier, specifically designed for car radio applications etc.

Specifications:

Power supply input : 18 VDC
Output power : 20 W, 4 Ω
IC built in Thermal Shut-down, Load dump voltage surge protected
Terminal pins for connecting left and right audio signal inputs
Berg Connector for connecting Potentiometer (POT) for volume adjustment
Power Battery Terminal (PBT) for easy power supply and speaker connection
Power-On LED indicator
Heatsink for IC
Four mounting holes of 3.2 mm each with nut and stud
PCB dimensions 63 mm x 65 mm
Note : Use shielded cable for connecting Potentiometer

20w_bridge_audio_amp_schematic 20w_bridge_audio_amp_bom1 20w_bridge_audio_amp 20w_bridge_audio_amp_bom

Microphone Pre-Amplifier Based on LM358

mic-pre-amplifier-1

This is easy to construct microphone pre-amplifier project using compact electret condenser microphone. The pre-amplifier is important building block of many audio communication systems. Circuit has been built around Op-Amp LM358.

Power supply : 5 to 12 VDC @ 10 mA
Output: Gain Approx. 100
On-Board electret condenser microphone
Header connector for connecting of power supply input and audio output
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 35 mm x 40 mm

 

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mic-pre-amplifier-3

mic-pre-amplifier-1

mic-pre-amplifier-2

14W Stereo Audio Amplifier LM4730

14W STEREO AUDIO AMPLIFIER

14W Stereo audio power amplifier build around LM4730 IC. The LM4730 is stereo audio amplifier capable of delivering typical 14W per channel of continues average output power a 4 Ohms or 8 Ohms load with less than 10% THD+N from  20Hz to 20Khz frequency. Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled by onboard slide switches.

 The LM4730 has short circuit protection and thermal shutdown feature that is activated when the IC temperature exceeds 150 centigrade. The LM4730 also has under voltage lock out feature for click and pop free power off and on. Amplifier required proper heat sink.

Applications
  • Audio Amplifier for High End Stereo TVs
  • Audio Amplifier for Component Stereo
  • Audio Amplifier for Compact Stereo
  • Audio Amplifier for PC
  • Audio Amplifier for Self Powered Speakers
Specifications
  • Outout Power into 4 Ohms or 8 Ohms , 14W
  • THD+N  10%
  • THD+N at 1Khz with 2X1W into 8Ohms 0.02%
  • Mute Attenuation 85dB
  • Standby Current 3.5mA (+/- 17V)
  • Dual power supply – ±18 VDC
  • Less then 10% THD+N from 20 Hz – 20 KHz
  • Onboard slide switch for mute and standby mode
  • Terminal pins for connecting left and right audio signal inputs
  • Header connector for connecting Potentiometer (POT) for volume adjustment
  • Power Battery Terminal (PBT) for easy dual power supply and speakers connection
  • Power-On LED indicator

14w_audio_amplifier_schematic

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14w_stereo_amp_top

14w_stereo_amp_pcb_bottom

14w_stereo_amp_bom

 

 

 

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