Tiny Mic Pre-Amplifier

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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

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Mini Stereo Audio Amplifier TDA2822

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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

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6.5W Stereo Audio Amplifier Based on TDA2004

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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

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Small Signal Amplifier (Pre-Amplifier) For Audio Signal

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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

 

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20W Bridge Audio Amplifier TDA2005

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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

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Microphone Pre-Amplifier Based on LM358

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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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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

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12W Audio Amplifier Circuit Based On TDA2006

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Project is built around TDA2006 PENTAWATT package. TDA2006 provide high output current and has very low harmonic cross-over distortion. Further the device incorporate- rates an original (and patented) short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A conventional thermal shutdown system is also included. The TDA2006 is pin to pin equivalent to the TDA2030.

Specifications:

18V 2amps Single Supply
Power supply up to 18 VDC
Output power 12 W @ 4 Ω, 8 W @ 8 Ω
TDA2006 provides high output current
Has very low harmonic and cross-over distortion
Short circuit protection/Thermal shutdown system in IC
Terminal pins for connecting audio signal input
Header connector for connecting potentiometer (POT) for volume adjustment
Screw terminal connector for easy power supply input and speaker connection
Power-On LED indicator
Heatsink for IC
Four mounting holes of 3.2 mm each with nut and stud
PCB dimensions 51 mm x 63 mm

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Stereo Tape Head Pre-Amplifier Circuit

STEREO TAPE HEAD PRE-AMPLIFIER (1)

The circuit is built around a popular Sanyo’s stereo head preamp IC LA3161. Low electrical signals from the playback heads are fed to pins 1 and 8 of IC1 via DC decoupling capacitors, respectively. Components between pins 2 and 3 and pins 6 and 7 provide adequate equalization to the signals for a normal tape playback.
Specifications:

Power supply: 9 ~ 12 VDC @ 20 mA
Output power: upto 200 mW
Input Resistance – 100 KΩ (Typ), Load Resistance – 10 KΩ (Typ)
Low noise, good ripple rejection owing to the on-chip voltage regulator
Berg pins for connecting power supply, input and output
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 49 mm x 38 mm


STEREO TAPE HEAD PRE-AMPLIFIER SCHEMATIC

STEREO TAPE HEAD PRE-AMPLIFIER (3)


PCB LAYOUT

STEREO TAPE HEAD PRE-AMPLIFIER (2)

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BOM

STEREO TAPE HEAD PRE-AMPLIFIER (1)

Audio Oscillator Generator Adjustable 115Hz-1Khz

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Audio Oscillator project simply produces audio tones for use in the range of 115 Hz to 1 KHz.  This kit is a must for audio technicians and experimenters alike.

Input : 6 VDC @ 325 mA
Output : Speaker, 8 Ω / 0.5 W
Range 115 Hz to 1 KHz Selectable by Onboard PRESET
ON/OFF slide switch for power supply
Terminal pins for supply voltage and speaker output
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 39 mm x 42 mm

 

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