AN7112 Schematic 0.5 Watt audio amplifier

Description:

• The AN7112 is a monolithic  integrated circuit designed for 0.5W audio power amplifier.

Features:

• Wide operating supply voltage range: Vcc= 4V...14V
• Low quescent current ICQ = 15mA (at Vcc=6V, RL=8Ohm)

Crossover cable pinout for Ethernet

Crossover cable pinout for Ethernet

Crossover cable pinout

Connector 1	Connector 2
1	3
2	6
3	1
6	2

db9 pin configuration

DB9 RS232 pinout

Pin	Signal	In/Out	Description
1	DCD	In	Data Carrier Detect
2	RxD	In	Receive Data
3	TxD	Out	Transmit Data
4	DTR	Out	Data Terminal Ready
5	GND	-	Ground
6	DSR	In	Data Set Ready
7	RTS	Out	Request To Send
8	CTS	In	Clear To Send
9	RI	In	Ring Indicator

      db9 pin configuration

15 Watt Stereo Power Amplifier using TDA4935

TDA4935 is bipolar stereo amplifier IC that can be wired as a 2X15W stereo amplifier or a 30W mono BTL amplifier. The IC also features built in circuitry for over load protection and over temperature shut down. Here the IC is wired in stereo mode in order to deliver 15W power on each speaker. The circuit does not require a dual power supply and it can be powered from anything between 8 to 24V.Here I am using 24V for getting maximum output power.

15 Watt Stereo Power Amplifier using TDA4935

The circuit can be powered from anything between 8 to24V.
Use 20W, 4 Ohm speakers for K1 and K2.
All electrolytic capacitors must be rated at least 25V.

30-watt stereo amplifier with TDA4935

The amplifier is now offer stereo and Class B is designed with the TDA4935 from Siemens, which delivers 15 watts per channel. Can also be configured in BTL or bridge, thus providing 30 watts in mono.

His power depends on the output impedance, ie if you put a 8 ohm speaker, will be supplied with a minimum of 8 and a maximum of 32 volts for this design we chose 24 volts, as recommended in the datasheet ; if placed unabocina 4 ohms, as in our case, the maximum voltage to be applied is 24 volts. It should be mentioned that the ideal supply voltages are at least 8 and a maximum of 26, to guarantee the life of the integrated circuit.

This amplifier has the characteristic of utlized few external components, making it easy to assemble, capacitors and 2 resistors 9

At the moment we do not offer the PCB, but the data sheet can be seen both in design and in BTL stereo configuration, bridge or bridge.

In the BTL configuration you will get a 60 watt amplifier with the assembly of 2.

 

 

 

Parts list :

 

capacitor:

 

C1, C2, C3, C4: 220 nF. ceramic capacitors

C5, C6, C8: 1000 µF. 35v  ,   electrolytic capacitor

C7: 100 µF. 35 volt  , electrolytic capacitor

C9: 100 nF. ceramic capacitors

Semiconductores:

IC1: TDA4935

R1, R2: 1 Ω 2 watt

Other :

Speakers 4 Ω 30 watt

Supply of 13.5 volts

SW1: Switch 1 pole 1 position.

 

Audio video transmitter am fm radio transmitters

When we started in electronics, the first thing I think most, is to assemble a transmitter. In my beginnings, my first transmitter is performed by using the local oscillator of a radio receiver, logando a range of 500 meters, in amplitude modulated.
If you like radio and TV broadcasts, here I include these audio and video transmitters (limited), FM and medium wave.  It is important to be careful regarding the transmission of radio signals, in many countries this is illegal, therefore these circuits are low power so as not to interfere with any radio or TV. These are so you can experience.

STR-A6000 Power IC for PWM Type Switching Power Supply

General Descriptions
The STR-A6000 series products are power ICs for switching power supplies,
incorporating a power MOSFET and a current-mode type PWM controller  IC.  The low
standby power is accomplished by the automatic switching between the PWM operation in
normal operation and the burst-oscillation under light load conditions. The product
achieves high cost-performance power supply systems with few external components.

 Features
*  Current-Mode Type PWM Control
*  Built-in Random Switching Function
The function reduces the EMI noise and enables a simplified (low-cost) EMI filter,
by the slight- random-change of PMW frequency fOSC.
*  Auto-Standby Function: The burst-oscillation enables the low standby power. Input Power PIN < 25mW at no load
*  Built-in Startup Circuit, enabling low power consumption
*  Brown-In / Brown-Out Function
The function enables the oscillation start/stop by externally rated input voltage and makes protections at low input
voltage.
*  Overcurrent Protection (OCP) with Built-in Input Compensation Circuit: 
The protection has less AC input voltage dependency.
*  Overload Protection (OLP) with Built-in Delay Timer
*  High Speed Latch Release Function
The function releases the latch immediately at AC supply OFF, after the latch protection operation.
*  Bias-Assist Function, reducing Operating VCC voltage drop
The function improves the startup operation and makes a low VCC capacitor applicable.
*  Leading Edge Blanking Function
*  Slope Compensation Function
*  Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET
*  Various Protections
 Overcurrent Protection (OCP)--------------------------------- Pulse-by-Pulse
 Overload Protection (OLP) ------------------------------------ Auto-Restart
 Overvoltage Protection (OVP) -------------------------------- Latch Shutdown
 Thermal Shutdown Protection (TSD) ------------------------ Latch Shutdown

 Applications
*  Battery Chargers; Mobile Phones, Digital Cameras, Camcorders, Electric Shavers, Emergency/Inducement Lights etc.
*  Standby Power Supplies; LCD-TVs, PDP-TVs, Desk-Top PCs, LBPs, Audio Equipment, etc.
*  Small SMPSs; Ink Jet Printers, BD/DVD Players, CD Players, Set-Top-Boxes, etc.
*  Auxiliary Power Supplies for Controllers; Air Conditioners, Refrigerators, Washing Machines, Dish Washers, etc

  Product Lineup

Note 1: The maximum output power is derived from thermal specifications. The actual output power may be
available around 120 –140% of the above values, respectively, but may be limited by ON duty setting on
transformer design or lower output voltage.

download original datasheet

resistor calculator

Resistor Calculator 1.0

 

Features of Resistor Calculator at a glance:

• Calculating the color code of a resistor value.
• Calculating the resistor value of a color code.
• Displaying the closest resistor of the E series and Renard numbers.
• Resistor calculation for LED circuits (single, in series, parallel).
• Integrated help system.
• Automatic program updates.
• Multilingual (at the moment English and German).
• Intuitive program interface.
• Free e-mail support in case of problems or questions.
• All updates for free.

>> Download Resistor Calculator <<

source :http://www.ab-tools.com/English/software/resistorcalculator/

Night (dark) and a light emitting diode lights.

Night (dark) and a light emitting diode lights.
I think that can be produced easily by using fewer parts.

Schematic

 Once the device for adjusting the light like fireflies.  Turning the adjustment can be variable resistors. Try turning slowly from side to side to bring the device to the variable resistor dark room.  The glowing light-emitting diode. Try moving the unit next to a bright room. If the adjustment is made completely light-emitting diodes should disappear.



 Circuit description
 This circuit has become the focus of three basic parts. CdS and the light hits, the transistor becomes smaller internal resistance is the addition of B and C negative voltage E between the current flow. So do not light emitting diodes.  But the bigger CdS resistance to light exposure and internal voltage plus the addition of B to become a trigger that C, E between the current flows, it is not a light emitting diode.

Parts required for production

Transistor	2sc1815	× 1
Rheostat	Ω 100KΩ	× 1
Resistor	Ω 100Ω	× 1
CdS		× 1
Light emitting diode	Green	× 1
Board	Appropriate sized	× 1
Battery holder	For single- III	× 1
Battery snap	Single-III	× 1