Mono Power Amplifier A1015, BD140 ,TIP2955

Mono Power Amplifier - A1015, BD140 ,TIP2955 Circuit Diagram


Typically audio amplifier stereo amplifier to a two amplifier. And if a mono amplifier is a single speaker. However this circuit command be present extended to the mono two loudspeaker.But not a equivalence or else serialization access.This makes it needless impedance of the speaker has altered.But will remain to utilize the spokeswoman as a replacement for of the resistance - Collection Peter (RC) of the transistor.The circuit can be alive prolonged to 2 loudspeaker itself.

What time raising the power supply circuit and the audio to input. the audio sign coupling to through the C1 and R1 to increase with the Q1.Which Q1 serves like the Regional Pre amp amplifier to power up to a one point.already conveyance it to Q2.Which Q2 is connected to emitter follower circuit.be active as a driver amplifier intimate section from the pre amp section provides added power to drive the Q3 perform. and Q3 motivation provide while a Regional Power amp amplifier output to the spokeswoman.The opinion of the audio intimate through the VR1 and R2 to enter the pin B of Q2.To control the stability of working instead of well brought-up.This circuit is an output of 40 milliwatts watts of distortion of the gesture rate is by the side of 0.1 percent.And frequency response from 15 Hz - 200 kHz.

Circuit Power Amplifier OTL 50W by 2N3055

If you are seeking power Amplifier at loud good sound , durable and economize. I begs for to advise Circuit Power Amplifier OTL 50Watt by 2N3055 , because of use the equipment that seek good easy and build not difficult with. Many you who tell amp OTL the sound is not good. Me chest edge that be not the loud sound is excellent. Then like to use general ( in the past ) although in contain divide still have use. I like it fining decorates the circuit. Just you feed power supply 50V 2A also the work has already and a loudspeaker should use 8ohm 12 inc. sizes. Besides still model PCB for the convenience of friends. Request have fun Power Amplifier OTL 50Watt , please sir.

Car Audio Amplifier TDA1557Q TDA1553Q

This stereo audio amplifier is for car purpose and can deliver up to 2 x 22W using a single TDA1557Q or TDA1553Q IC from Philips.

TEA2025B bassed amplifier circuit and explanation

A very simple audio amplifier electronic project that can be used in small portable audio applications can be designed using the TEA2025B audio amplifier IC . This audio power amplifier project supports a wide input voltage range between 3 and 15 volts .
Input capacitor is PNP type allowing source to be referenced to ground.
In this way no input coupling capacitor is required. However, a series capacitor (0.22uF)to the input side can be useful in case of noise due to variable resistor contact.
The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors (100μF) avoids a reduction of the output signal also at low frequencies and low supply voltages.
The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected between pin 6 (11) and ground. The frequency response is given approximated Input capacitor is PNP type allowing source to be referenced to ground.
The frequency response is given approximated : VOUT/VIN= R1/(Rf +R2 +(1/JWC1))
The maximum output power that can be obtained using the TEA2025B audio amplifier in stereo mode is around 2.3 watts on a 4 ohms load .

Diagram Block IC TDA7377

The TDA7377 is a new technology class AB car radio amplifier able to work either in DUAL BRIDGE or QUAD SINGLE ENDED configuration.



The exclusive fully complementary structure of the output stage and the internally fixed gain guarantees the highest possible power performances with extremely reduced component count. The on-board clip detector simplifies gain compression operation. The fault diagnostics makes it possible to detect mistakes during car radio set assembly and wiring in the car.

The stand-by can be easily activated by means of a CMOS level applied to pin 7 through a RC filter. Under stand-by condition the device is turned off completely (supply current = 1µA typ.; output attenuation= 80dB min.). Every ON/OFF operation is virtually pop free. Furthemore, at turn-on the device stays in muting condition for a time determined by the value assigned to the SVR capacitor.

While in muting the device outputs becomes insensitive to any kinds of signal that may be present at the input terminals. In other words every transient coming from previous stages produces no unplesantacoustic effect to the speakers.

Medical ECG Monitors using the AD620 Instrumentation Amplifier

One of features of the AD620 instrumentation amplifier is low current noise, this benefit allows its use in theMedical ECG Monitor Circuit DiagramElectrocardiography (ECG) monitors. A medical ECG Monitor Circuit is shown in the following picture, please click to enlarge the picture.
The picture tells the use of AD620 in ECG monitors where high source resistances of 1 MOhm or higher are not uncommon. It can improve the dynamic range for better performance when low bias current and low current noise coupled with the low voltage noise of the AD620.

Capacitor C1 maintains the stability of right leg drive loop. An isolation addition to this circuit may protect the patient from possible danger.