Collection Schematic

This is a simple light running circuit by music This circuit is not difficult, is MONO, with a few accessories. Can be connected to the output of a CD or cassette player Time.
Operation of the circuit. Begins to be input via VR. The VR will function fine, signal strength coming. D1 will take disconnected hemisphere plus leaving only the signal hemisphere removed to activation of Q1. Signal is extended through Q1 to pin 5 input of IC1. By C1 forward delay of the IC is not the LED (connected to the output. of IC1) off immediately. The IC IC1 is finished. The act shows the effect of the voltage at IC1 pin 5 of the display by the LED to pins 1-19 of the IC, which is within range. compared to a multiple voltage standard circuits. The circuit can operate effectively. In the R1 that it will determine the current flowing through the LED. To prevent LED damage.
Use should be connected to the input of the circuit. To the speaker terminals, change the value of R3 is 10k and IC1 can choose to display two types Bar (Bar) when the pin 9 and a power source. Dots (Dot) on 9-pin to float to drop.

This is the diagram of simple portable amplifier schema. This amplifier schema build based on IC TEA2025 that is a monolithic integrated audio amplifier of 16-pin plastic dual in line package built by UTC manufacture. The schema has an internal thermal protection. The schema designed for portable cassette players and radios. You can also use as PC audio amplifier.

Here the amplifier diagram for stereo audio input/output:

and here the amplifier with mono audio input/output (bridge):

Stereo per channel
VCC=9V; RL=4 ohm/3W
VCC=9V; RL=8 ohm/2W

Bridge Application
VCC=9V; RL=8 ohm/5W
VCC=9V; RL=4 ohm/8W

Supply Voltage min = DC3v @ 500mA
Supply Voltage max = DC12v @ 500mA
Supply Voltage recommended = DC9v @500mA

Download TEA2025 Datasheet
Download the schematic diagram in PDF format HERE

• Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications.
• Dual : 6W´2 (typ.)
• Bridge : 19W (typ.)
• Small pop noise at the time of power supply ON/OFF and good starting balance.
• Minimum number of external parts required.
• Good ripple rejection : 46dB (typ.)
• Easy to design radiator fin.
• Low distortion over a wide range from low frequencies to high frequencies.
• Small residual noise (Rg=0).
• Good channel separation.
• Built-in protectors.
• Built-in audio muting function.
• Overvoltage, surge voltage protector
• Thermal protector
• Pin-to-pin short protector