A car stereo amplifier using TDA2040 circuit shown here. TDA2040 is a monolithic integrated audio amplifier operating in Class AB mode. The IC has built in short circuit protection circuits and thermal very close and more about it can be operated from a single source. The amplifier can deliver 12 watts into a 8 ohm speaker. In the circuit of the IC is connected to operate from the 12V line cars. Capacitor C7 is a DC-decoupling capacitor and R4 provides. Network consisting of resistor R5 and capacitor C5 provides high frequency stability and avoids any possibility of oscillation. C6 capacitor couples the output circuits to the speaker. C2 and C1 are the filters of the power supply.

50 Watts Mosfet Audio Amplifier The first stage of the amplifier is a differential amplifier based on transistors Q1 and Q2. Capacitor C8 is the dc input coupler, C1 R1 limits the input current and capacitor passes high frequency signals. The second stage is the stage driver consisting of transistors Q3 and Q4. Output stage is a complementary push-pull stage based MOSFETs IRF530 and IRF9530.Output attaches the loudspeaker with the inductor L1. Network consisting of R15 and C5 is designed to reduce noise. Capacitors C6 and C7 are the filters of the power supply. R6 is preset to adjust the quiescent current.

The diagram shown here is a MOSFET amplifier circuit 10W of sound that only requires a single source. Single railway material rarely used in power amplifiers class-B. However, for low power applications like this is very thin. Actually I have this circuit a old cassette player is still working and republish as it is. The BD512 and BD522 power MOSFETs is obsolete now and you can use any other power MOSFET game instead of them. Transistors Q1 and Q2 are connected as a Darlington pair works as a preamp. R3 preset controls the quiescent current, while R2 provides. Output is coupled to the speakers through capacitor C4. Capacitor C5 is the power supply filter and C2 is the input DC decoupling capacitor. Notes. The circuit can be assembled on a vero board. Use 30V DC for powering the circuit. Do not expect much performance from this amplifier. Capacitors C3, C4, C5 must be rated 50V and C2 can be 10V. Use a 8 ohm 15W speaker as load.

18 Watts Mosfet Audio Amplifier This circuit is an audio amplifier capable of delivering a decent output power with a minimum no: of the parties, with remarkable sound quality. The amplifier uses a single transistor and two MOSFETs and resistors and capacitors some feedback loop in a small scheme.This can bypass may offer a huge 18Watts into 8 ohm speaker or a speaker 30 W at 4 ohms. For best performance and stability of some components, high-quality well-regulated DC power supply is needed. This is very essential to reduce noise and achieve a constant output power at different loads. A good voltage regulator capable of delivering CC over 2 Amps @ 40V can be used.You can expect a power supply design very soon here in the food section.

An 30 Watt audio amplifier circuit with TDA2040 shown here. TDA2040 is class AB amplifier monolithic integrated audio Pentawatt available in the package. The IC has a low harmonic distortion, cross low over the distortion and has a built in short circuit protection circuit. In the circuit of two TDA2040 ICs are connected in BTL (bridge tied load) configuration to provide an output of 30W into a 8 ohm speaker to + /-16V DC. Capacitor C1 is a decoupling capacitor DC input. Network consisting of components R2, C4, R3 provides information to IC1 as R7, C6, R8 network provides information of IC2. Red C5, C9 and R5, R9 provides high frequency stability. Capacitors C2, C3 filters positive power rail while the capacitors C7, C8 filters negative power rail.

This timer circuit can be used for a particular device off after about 35 minutes. The circuit can be used to turn off devices like radio, TV, fan, pump etc., after a set time of 35 minutes. A circuit can certainly save a lot of energy. The circuit is based on quad 2-input CMOS IC 4011 (U1). The resistor R1 and capacitor C1 produces the required delay too long. When the switch S2 button is pressed, the capacitor C1 discharges and the entry of the four NAND gates are pulled to zero. The four outputs short of U1 to go high and turn on the transistor Q1 to drive over. The device is connected through the relay is on. When S2 is released and C1 begins charging when the voltage at the positive pin is equal to half the supply voltage U1 outputs becomes zero and the transistor is off. This makes the relay off and the device connected through the relay off. The timer can be done to stop when necessary by pressing the switch S1.

TDA2822 is a monolithic integrated audio amplifier can be configured in stereo mode or bridge (BTL). The IC has low crossover distortion, low quiescent current and is available in 16 pin DIP package power. The TDA2822 may be operated from a supply voltage range of 3V to 15V. The main applications are headphone amplifier TDA2822, portable audio, radio, mini headphones, preamp etc. The IC can deliver an output power of 0.65W per channel into a 4 ohm speaker 6V @ HV mode 1.35 W stereo and a speaker 4 ohm high voltage supply 6V @ bridge mode. IC TDA2822 stereo set shown in Figure 1. The left channel input is applied to the noninverting input (pin 1) of the first built in the amplifier stage and the right channel input is applied to the noninverting input (pin 16) of the second amplifier. The inverting input of these built in amplifiers are grounded separately using 1000uF capacitors (C5 and C6). The amplified outputs (left and right) are available at pins 6 and 11 of the IC. The outputs...

Here is a 10W MOSFET audio amplifier circuit , sound that only requires a single source. Single railway material rarely used in power amplifiers class-B. However, for low power applications like this is very thin. Actually I have this circuit a old cassette player is still working and republish as it is. The BD512 and BD522 power MOSFETs is obsolete now and you can use any other power MOSFET game instead of them. Transistors Q1 and Q2 are connected as a Darlington pair works as a preamp. R3 preset controls the quiescent current, while R2 provides. Output is coupled to the speakers through capacitor C4. Capacitor C5 is the power supply filter and C2 is the input DC decoupling capacitor.

Here is a Simple Circuit Temperature Controlled DC Fan primarily based on 2 transistors which will be used to control the speed of a 12 V DC fan looking on the temperature.A thermistor (R1) is employed to sense the temperature. When the temperature will increase the base current of Q1 (BC 547) will increase that in flip decreases the collector voltage of the same transistor. Since the collector of Q1 is coupled to the base of Q2 (BD 140), the decrease in collector voltage of Q1 forward biases the Q2 lot of and so do the speed of the motor. Also, the brightness of the LED are going to be proportional to the speed of the motor. Notes. The R1 can be a 15K @ 20°C ,N.T.C thermistor. The M1 can be a 12V,700mA fan motor. The capacitor C1 must be rated 25V. The circuit can be powered from a 12V PP3 battery or 12V DC power supply. Assemble the circuit on a good quality PCB or common board.

Automatic night light cheap and simple with few transistors and the NE555 timer is shown here. The circuit automatically turns on AC lamp after dark and the light turns off automatically after a preset time. The operation of this circuit very simple night light. A LDR is used as the sensor here. At the time of day of the LDR resistance will be low as the voltage drop across it, the transistor Q1 will be on how to carry out. When darkness falls the resistance of LDR increases, so does the voltage across it. This causes the transistor Q1 OFF. Base of Q2 is connected to the emitter of Q1 and Q2 which is biased in that turn, the powers of IC1. NE555 is wired as monostable multivibrator which is activated automatically when the power is. This automatic release is achieved with the help of the capacitor C2. The output of IC1 remains high for a time determined by resistor R5 and capacitor C4. When the output of IC1 goes high transistor Q3 is turned on which activates triac T1 ...

A voltage-controlled oscillator using NE555 The circuit is usually known as a voltage-to-frequency converter as a result of the output frequency will be modified by changing the input voltage. As mentioned in previous blog posts, pin 5 terminal is voltage control terminal and its function is to manage the edge and trigger levels. Normally, the control voltage is ++2/3VCC because of the inner voltage divider. However, an external voltage will be applied to the current terminal directly or through a pot, as illustrated in figure, and by adjusting the pot, control voltage can be varied. Voltage across the timing capacitor is depicted in figure, that varies between +Vcontrol and ½ Vcontrol. If control voltage is increased, the capacitor takes a extended to charge and discharge; the frequency, therefore, decreases. so the fre­quency will be modified by changing the control volt­age. Incidentally, the control voltage is also created offered through a pot, or it should be output of a transis...