Subwoofer Filter and Low Pass Filter with LM741

The acoustics of converting a filter, there are many aspects of the economic viability of the more famous are baxandal filter low and high frequency filters and crossover Acoustic space is transformed into sub-domains, so that the Thursday Speakers. Applications, we offer a filter, the limits of the region to transform acoustic (20-20000Hz) in the region of 20-100Hz.

Subwoofer Filter and Low Pass Filter Circuit Diagram

The signal for a first high pass filter C1, C2, P1, which is undesirable level DC input. A lowpass filter consisting of R3, R4, C3 prevents frequencies above 10 kHz, which do not benefit from this design, and it would be that the instability and noise. The summary amp invert signal.

The low Summary of the amplifier signals go to a second low-pass filter to prevent the frequency from the speakers. I decided, a second order, as this box with a closed place feature. If you have a circuit with a valve system, and then simply close the Wind (Roll a pair of socks and pick at the port / Wind), this will give you a sealed box instead.

Read More

Simple Light Sensor Alarm circuit with NE555

Occurring this circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 stable multivariate was used here which sent signal a tone of about 1kHz upon detecting light.The sensor when exposed by light completes the circuit and makes the 555 oscillate at about 1kHz with transistor to drive current.

The sensor is also shown in the circuit diagram. It has to placed making an angle of about 30 – 45 degrees to the ground.

 Sensitivity can be adjust with P1.
 This makes the sun light to flow through it to the ground and prevents the alarm from going on due to the stored light on the sensor

Read More

Simple Light Sensor Alarm circuit with NE555

Occurring this circuit despatched out an alarm when its LDR sensor is exposed to gentle by way of solar or lamp. A 555 steady multivariate used to be used here which sent sign a tone of about 1kHz upon detecting mild.The sensor when uncovered by mild fulls the circuit and makes the 555 oscillate at about 1kHz with transistor to pressure current.

The sensor can be shown within the circuit diagram. It has to placed making an angle of about 30 – forty five degrees to the bottom.

 Sensitivity will additionally be regulate with P1.
 This makes the solar gentle to drift via it to the bottom and stops the alarm from happening as a outcome of the saved mild on the sensor

Read More

150W BRIBGE AMPLIFIER WITH TDA 7294 CIRCUIT DIAGRAM

150W BRIBGE AMPLIFIER WITH TDA 7294 CIRCUIT DIAGRAM

As you can see, there are provisions to use TDA7294 well. This circuit is almost identical, but a specification higher. There are links on the board to connect contacts 1 and 5 (it should not be connected to the TDA727). Use TDA7294, fees can run bridged (BTL or bridge tied load) to about 150 W at 8 ohms. I think P87B be used to provide phase signal is necessary for BTL operation. Although it is common to see AMP as a reversal, there is a very low resistance at first, and may lead to unacceptable pressures and possible distortion. P87B be managed separately by each amplifier, and the best way to control the amplifiers.While parallel operation is often recommended, I strongly recommend that you run the amps in parallel. There are very strict requirements for greater tolerance for parallel operation – usually amplifiers must correspond to 0.1% or more for all audio traffic and beyond. A very low output resistance of members, even inconsistencies 100mV (instantly, any voltage and frequency) can cause large amounts of current flowing through the circuits. Although 0.1O resistors are usually offered, inconsistencies 100mV voltage (0.15% at the peak voltage 60V) 0.5A cause a circulating current. This leads to overheating and protection of anger involved.

Read More

Power Supply Circuit with Emergency Backup

The circuit shown below was requested by one of the readers, it is a power supply circuit which trickle charges a battery when AC mains is available, and also feeds the output with the required DC power via D1.  Now, the moment AC mains fails, the battery instantly backs up and the compensates the output failure with its power via D2.

Parts List

All Diodes = 1N5402 for battery up to 20 AH, 1N4007, two in parallel for 10-20 AH battery, and 1N4007 for below 10 AH.

R1 = volt/charging current (Ohms)

Transformer Current/Charging current = 1/10 * batt AH

C1 = 100uF/25

Read More

Amplifier audio small to use with 9V battery operated

This is an
audio amplifier that can be used with a small 9 volt Battery
Operated,Current use as little as 5 milliamps.And amplification up to
500 mW.
Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speakers clearly.
When entering the power supply 9-volt circuit IC1 number LM386 amplifier IC size is 300-800 mW, Depending on the power supply circuit with,This is from 4-15 volts.


Once entered into the input pin 3,The non inverting pin to amplifier
non-return phase.C1 will be served cut out the noise input to ground.And
C2 increases the rate of amplifier,C2 is to add more value.But if the
C2 Too much distortion (the C2 should not exceed 100uF).The output of
IC1 is out of the pin 5 through C4 coupling audio signals to better and
DC block and not passed to the speaker.For the audio portion will also
be fed back through R2 and C3 to the high frequency response better.
++++++++++++++++++++++++++++++
Next circuit ideals that use LM386 IC.

Amplifier 500 mW with ic LM386N

This
circuit number LM386 IC is used as the IC, which is popular is that it
has. It is a simple circuit. Less equipment items. Suitable for use or
used in small trials.
The properties of the IC can be used from
4V-12V power supply for low current at 50 mA only. And the frequency
response from 40Hz – 100 kHz rate of expansion of 46 dB and distortion.
Less than 1%.


When entering the power supply light LED1 circuit to tell the
operating environment of the circuit. C6 and C7, with a page filter to
smooth then be entered through one input sound signal.
C1 coupling
signal protection dc voltage noise in circuit to the sound signal that
is transmitted through VR1 for controller level reputation of sound
signal and then sent to the input to pin 3 of IC1.
boost up output at
pin 5 through C5 for protection dc voltage and meet the low frequency
better and send out put speakers. The C4 and R1 is acting eliminate
noise signal out and the pin 1 of IC will have a jumper for. to access
the C3 to boost up rate increase in case the circuit to be used to
boost up signal is very small.

Small audio amplifier IC 7w using lm383

This
circuit, will help expand the sound small. such as radio, sound out,
including CD WALKMAN. To the more powerful sound.The amplifier circuit
can be up to 7 watts. Enough to use a good listening room.And most
importantly is a very simple circuit.


Operation of the circuit. be Input signal is coupling with the
C1.Passed into the pin 1 of IC1 number LM383. Amplifier output from
the pin 4.Through C3 increase in low frequency stability better, before
leaving to the speaker. The R2 and R3 set the gain 100 times. Which is
calculated from the (R3/R4) +1.The C2 functions help in frequency
response.

Read More

Power supply with driver TEA1507

Power supply with driver TEA1507 is mostly used by TV branded PHILIPS. Power Supply has an efficiency rate of up to 90% - thus requiring less cooling, as well as stand-by power required is less than 1 watt.

Power Supply with TEA driver is equipped with a variety of surge protector that has a high reliability - not easily damaged if any part of a damaged power supply circuit and power transistor or FET heat is not easily damaged. Power supply circuits are dapatapat working on ac input voltage between 85 up to 275v. The way it works with the driver circuit power supply TEA 1507 is quite simple, so easy tracking of damage to the circuit.

The picture above is the basic power supply circuit with TEA1507

Read More