Rongge

This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductor's application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used. The LM3886 circuit is in a non-inverted configuration, so the input impedance is determined by the input resistor R1, i.e. 47k. The 680 ohm and 470pF resistor capacitor filter network is used to filter out the high frequency noise at the RCA input. The 220pF C4 and C8 capacitors are used to shot out the high frequency noise at the LM3886 input pins. I used high quality audio grade capacitors at several locations: 1uF Auricap at the input for DC blocking, 100uF Blackgate for C2 and C6, and 1000uF Blackgate at the supply filter. LM3886 Power Amplifier Schematics The PCB is designed in a way that the power ground is separated from the signal ground, as you ca...

Using the LM48824 integrated circuit , can be designed a very simple stereo headphone amplifier for portable devices . Stereo Headphone Amplifier Circuit diagram The LM48824’s Stereo Headphone Amplifier (Class G architecture ) increases audio (MP3, mobile TV, etc.) playback time with its adaptive power supply approach that enables very low supply rails, which doubles the power-efficiency compared to typical Class AB headphone amplifiers. A high output impedance mode allows the LM48824's outputs to be driven by an external source without degrading the signal.

Quality Stereo Wireless Microphone or Audio . This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but this one is a little different. It’s stereo, providing surprisingly good quality sound. Second, it has a really good range. We tested it at well over 50m and it was still performing very well – noise-free, in fact – but at the time we couldn’t get our receiver any further away. So it’s likely to have even better range than that. Complete Project: It's easy to build, requires very little setup... and it's cheap! In fact, the low price might turn some people off, thinking it's low quality. Try it - and be pleasantly surprised! Third, it really is simple to build – the hard work (the transmitter module) is already done for you. It’s just a matter of assembling the microphone module, which contains the electret mics themselves, ...

Oscilloscope screen capture of output from the audio player Top - left channel Bottom - right channel Using the PIC32MX250F128B, I decided to make a simple audio player. I wanted to play back good quality audio from a large memory space - a microSD card. So, I made this WAV player that can play back 16-bit 44.1kHz WAV files with 12-bit stereo audio output. Of course that's not all it can play back. It is programmed for automatic period configuration so that the period is set on the fly based on the song sample rate. It can play back both 8-bit and 16-bit mono and stereo audio files and I have tested from 8kHz 8-bit mono to 44.1kHz 16-bit stereo. The player itself does not include an audio amplifier to drive speakers but can drive earphones. I've used an external stereo speaker for testing. The hardware is fairly simple! Using the Microchip Memory Disk Drive File System (MDDFS) library, and my previous work using the MCP4822 dual 12-bit DAC, integrating these components to make ...

Voltage V - / 01: 120/230 Frequency - / 01: 50/60 Hz Battery -: 9 V - R14 / UM-2 / C size x 6 Power consumption: 12 W Dimensions (H x W x D): 360 x 225 x 152mm Weight 3.3Kg Tuning Ratio: 87.5 - 108 MHz IF frequency: 10.7 MHz p 0.2 MHz DISASSEMBLY (Click on the pictures to magnify) A. REMOVE THE REAR CABINET  Remove the 3 A1 screws (3x10)  Remove the 5 screws A2 (3x30)  Remove the Rear Cabinet. B. REMOVE THE HAND STRAP  Press the cover down and Pull the handle.  Remove the hand strap. C. REMOVE THE TOP CABINET - Remove the 2 C3 screws (3x20) - Remove the screw C4 (3X10) - Remove the Upper Cabinet. D. REMOVE DECK MECHANISM - Remove the 4 screws D5 (3x10) - Remove the 4 C6 screws (2.5x10) Circuit diagram (Schematic)

Here is a stereo tape head preamplifier circuit for your PC sound card that can playback your favourite audio cassette through the PC. Audio signals from this circuit can be di Here is a stereo tape head preamplifier circuit for your PC sound card that can playback your favourite audio cassette through the PC. Audio signals from this circuit can be directly connected to the stereo-input (lineinput) socket of the PC sound card for further processing. The circuit is built around a popular stereo head preamp IC LA3161. Circuit diagram: Stereo Tape Head Preamplifier For Pc Sound Card Circuit Diagram Weak electrical signals from the playback heads are fed to pins 1 and 8 of IC1 via DC decoupling capacitors C1 and C6, respectively. Components between pins 2 and 3 and pins 6 and 7 provide adequate equalisation to the signals for a normal tape playback.  The amplified and equalised signals available at output pins 3 and 6 of IC1 are coupled to the inputs of line amplifier circuit built aro...

  *note : Stereo Amplifier I've tried this Circuit Amplifier  and was resulting in very satisfactory . The sound that issued a very nice and smooth. It's just that there is little noise, but the noise will go away when a loud sound. And strange , sound effects can out by itself  and by simply adding tone control. Minimum supply voltage is 5 volt , and maximum supply voltage is 18 volt . Maximum power output  2 X 10 watt with minimum impedance 4 Ohm. See this schematic Circuit below : This is schematic circuit and i design in simple circuit. Click to view Enlarge

Features 1 watt per channel with 8-ohm load Max. efficiency » 80% with 8-ohm load at 5 volts Filterless Digital gain control Build-in depop circuitry Error protection for short circuit and over-temperature Mute (shutdown) current < 1µA typical Low operating current (4mA at 5 volts without load) TSSOP 24L package available  General Description The AP130 is an oversampling class-D power amplifier for  stereo audio applications. It provides high power-efficiency for filterless 8-ohm load. Build-in depop, mute and gain control features simplify the applications. BTL (Bridge-Tied-Load) configuration delivers up to 1 watt into 8-ohm load per channel at 5-V supply voltage. It allows direct coupling of the power signal. Reliability is improved through over-temperature and short circuit protections. The class-D power amplifier enables high efficiency applications for portable devices. Circuit Diagram 1W Per Channel Stereo Class-D Audio Power Amplifier