Friday, December 20, 2013
Astabil Multivibrator
Astabil Multivibrator circuit |
HOW TO WORK
Multivibrator device functioned as a trigger (triggered device) or free-running. Multivibrator trigger requires the input signal / pulse. Multivibrator output is controlled or synchronized by the input signal.
Thursday, December 19, 2013
Power amplifier circuit 60 W mono
Wow this is nice intregated amplifier circuit , because this IC can be power output up to 60 Watt . With minimum require voltage 8 V , and maximum voltage 35 V . But this circuit isnt so good to working on car , because output sound is very loud but not smooth. Amplifier so good working on full range , with speaker full range 100W and impedance 8 Ohm.Below it is schematic :
Click to view large |
The circuit above use IC AN7170 , the original output power IC is 20 W with impedance. But with use the circuit output elevated up to 60W.
Metal Detector Circuit
Tuning circuit (tuned circuit) should be a part of our oscillator circuit so that if approached by a metal coil sensor specific hence the output frequency of the oscillation circuit is about to change. Variation changes the output frequency depends on the frequency chosen. The selection of the higher frequency will cause the circuit sensitivity increases because the greater the frequency change. Stay if the selection frequency is too high then the practice will produce a system that is not sensitive. This is because the high frequency of most will not be reflected back but will be absorbed by the soil, building materials.
Metal Detector Circuit |
Low battery detector circuit
You feel confused to detect wether a battery is low or high, or you want to be notified if the battery and has expired , this circuit can detect if a battery has begun to decrease its strength. Circuit is based on LM4250 IC is able to detect if the battery runs out and will issue a notification signal.
Wednesday, December 18, 2013
Toggle Switch with IR
ADC 0804 Microcontroler Interface Engineering
Schematic Power Amplifier with IC AN7117
Click image to view Enlarge |
Auto Sound Systems One Piece at a Time
Tuesday, December 17, 2013
Subwoofer Car Power Amplifier
This is circuit of Subwoofer Car Power Amplifier 15W BTL stereo channel audio power amplifier based IC TA 8215 residential by Toshiba. modish this power amplifier circuit, two TA 8215 ICs are used. This is pro obtaining four channels with the aim of is two channels from both IC. TA 8215 is an IC with power amplifier stages and preamplifier integrated inside Subwoofer Car Power Amplifier.
Battery Level Monitor Circuit
This simple circuit can monitor the charging process in 12 Volt Lead Acid battery or Tubular battery. The status of LED indicates whether the battery is accepting charge or not. It also indicates the full charge condition.
Battery Level Monitor Circuit Diagram |
When the circuit is connected to the battery before charging the LED indications will be
1. If the battery voltage is above 12 volts (that is the normal terminal voltage of 13.8), Zener conducts and Green LED lights and Red LED remains off.
2. If the battery voltage is below 12 volts, Zener remains non conducting and Green LED remains off and Red LED lights.
3. When the battery is connected to the charger, and if the battery is accepting charge, Green LED goes off and Red LED remains on. When the battery attains full charge, Green LED lights and Red LED goes off.
4. If the battery is not accepting charge, Green LED never lights, even after the prolonged charging. This indicates that the battery is not attaining the normal terminal voltage above 12 volts.
Metal Detector Circuit
Tuning circuit (tuned circuit) should be a part of our oscillator circuit so that if approached by a metal coil sensor specific hence the output frequency of the oscillation circuit is about to change. Variation changes the output frequency depends on the frequency chosen. The selection of the higher frequency will cause the circuit sensitivity increases because the greater the frequency change. Stay if the selection frequency is too high then the practice will produce a system that is not sensitive. This is because the high frequency of most will not be reflected back but will be absorbed by the soil, building materials.
Metal Detector Circuit |
Monday, December 16, 2013
40 Watt Fluorescent Lamps Diagram Schematics
Click To view larger | 40 Watt Fluorescent Lamps Diagram Schematics |
40 W Fluorescent Lamps Diagram Schematics
Active Audio System Use three TDA2052
Active Audio System Circuit Diagram
The subwoofer plays the 20 to 300 Hz frequency range, while the remaining 300 Hz to 20KHz are sent to two separate channels with stereo effect.If one of the amplifier is affected by clipping distortion the others amplifiers are not affected .
100 Watt Power amplifier with IC TDA1514
Power Amplifier TDA1514 , this power use the IC TDA1514 , minimum require voltage 12 Volt and maximum voltage 30 volts DC. Power output maximum 100 Watt mono with 8 ohms impedance. this circuit is High output power amplifier with IC. See schematic below :
7 1 Channel audio Surround Sound systems
7.1 Channel audio Surround Sound system |
Sunday, December 15, 2013
0 300V Variable High Voltage Power Supply
High power amplifiers
X260.5 offers a power output of 260W and comes with the Super-Symmetry topology features that can improve performance by adjusting the characteristic value of balancing and damping amplifier distortion / interference.
Simple physical size, weight that can be managed and high strength coupled with great performance make this device as the Pass Laboratories ideal power-amp in any system that refers to a 2-channel and multi-channel format.
In addition, it also brings flexibility X260.5 combination for consumers who already have a device Pass Laboratories Stereo amp and want to add an additional channel power amplifier that is suitable sonic Laboratories Pass that complements other devices that have been there before.
As a stand-alone product, X260.5 device is truly amazing. And its existence at this time will quench the thirst of customers with ease. Equilibrium dynamics coupled with tonal accuracy and spectral balance that provides live music by presenting a taste of the extraordinary closeness.
Pass Labs X260.5 is capable of processing and increase the power transformer and an AC EMI filters, high-speed/soft recovery rectifiers in parallel, the capacitor power supply that is more parallel and supply RC filtering, improvements to the forefront of the input circuit, and the addition of Clas A bias circuit single. This amplifier offers one RCA inputs and one XLR input connectors. And for those who are interested, you can gain amplifier device is worth 11000 USD or about 110 million dollars per pair. Wow, a fantastic price!
Create a Digital Volume Control Circuit
Click to view larger. |
Saturday, December 14, 2013
Frequency to Voltage Converter Circuit
Friday, November 22, 2013
Home theater design may require professional help
2 way Active Crossover
Power supply with driver TEA1507
LM139 Measure delay generator
Delay Generator Circuit Diagram using LM139 |
Rangkaian amplifier
Thursday, November 21, 2013
Ultrasonic Wave Receiver Circuit
Then the output signal will be amplified and passed to the comparator circuit (comparator) with a reference voltage determined based on the amplifier output voltage when the distance between the sensor mini vehicles with bulkhead / retaining walls to reach the minimum distance for the turn direction. Comparator output can be considered under these conditions is high (logic 1 ), while longer distances are low (logica0). Binary logics are then forwarded to the circuit controller (microcontroller).
- First - the first received signal will be strengthened first by the circuit transistor amplifier Q2.
- Then the signal will be filtered using a high pass filter at a frequency of> 40kHz by a series of transistor Q1.
- After the signal is amplified and filtered, then the signal will be rectified by diode D1 and D2 series.
- Then the signal through a filter circuit low pass filter at a frequency <40kHz through the filter circuit C4 and R4.
- After that the signal will go through the Op-Amp comparator U3.
- So when there is an ultrasonic signal into the circuit, then the comparator will issue a logic low (0V), which will then be processed by the microcontroller to calculate the distance.
Bridge Power Amplifier Using TDA7294
Bridge Power Amplifier Circuit Using TDA7294
Hybrid Headphone Amplifier
headphone listening can be technically superior since room reflections
are eliminated and the intimate contact between transducer and ear
mean that only tiny amounts of power are required. The small power
requirement means that transducers can be operated at a small fraction
of their full excursion capabilities thus reducing THD and other
non-linear distortions. This design of a dedicated headphones amplifier
is potentially controversial in that it has unity voltage gain and
employs valves and transistors in the same design.
Normal
headphones have an impedance of 32R per channel. The usual standard line
output of 775 mV to which all quality equipment aspires will generate a
power of U2 / R = 0.7752 / 32 = 18 mW per channel across a headphone
of this impedance. An examination of available headphones at well known
high street emporiums revealed that the sensitivity varied from 96 dB
to 103db/mW! So, in practice the circuit will only require unity gain
to reach deafening levels. As a unity gain design is required it is
quite possible to employ a low distortion output stage.
The
obvious choice is an emitter follower. This has nearly unity gain
combined with a large amount of local feedback. Unfortunately the
output impedance of an emitter follower is dependent upon the source
impedance. With a volume control, or even with different signal sources
this will vary and could produce small but audible changes in sound
quality. To prevent this, the output stage is driven by a cathode
follower,based around an ECC82 valve (US equivalent: 12AU7).
This
device, as opposed to a transistor configuration, enables the output
stage to be driven with a constant value, low impedance. In other
words, the signal from the low impedance point is used to drive the
high impedance of the output stage, a situation which promotes low
overall THD. At the modest output powers required of the circuit, the
only sensible choice is a Class A circuit. In this case the much
vaunted single-ended output stage is employed and that comprises of T3
and constant current source T1-T2.
The
constant current is set by the Vbe voltage of T1 applied across R5
With its value of 22R, the current is set at 27 mA. T3 is used in the
emitter follower mode with high input impedance and low output
impedance. Indeed the main problem of using a valve at low voltages is
that it’s fairly difficult to get any real current drain. In order to
prevent distortion the output stage shouldn’t be allowed to load the
valve. This is down to the choice of output device. A BC517 is used for
T3 because of its high current gain, 30,000 at 2 mA! Since we have a
low impedance output stage, the load may be capacitively coupled via
C4.
Some purists may baulk at the idea of using an electrolytic
for this job but he fact remains that distortion generated by
capacitive coupling is at least two orders of magnitude lower than
transformer coupling. The rest of the circuitry is used to condition
the various voltages used by the circuit. In order to obtain a linear
output the valve grid needs to be biased at half the supply voltage.
This is the function of the voltage divider R4 and R2. Input signals
are coupled into the circuit via C1 and R1.
R1, connected
between the voltage divider and V1’s grid defines the input impedance
of the circuit. C1 has sufficiently large a value to ensure response
down to 2 Hz. Although the circuit does a good job of rejecting line
noise on its own due to the high impedance of V1’s anode and T3’s
collector current, it needs a little help to obtain a silent background
in the absence of signal. The ‘help’ is in the form of the capacitance
multiplier circuit built around T5. Another BC517 is used here to
avoid loading of the filter comprising R7 and C5. In principle the
capacitance of C5 is multiplied by the gain of T5.
In practice
the smooth dc applied to T5’s base appears at low impedance at its
emitter. An important added advantage is that the supply voltage is
applied slowly on powering up. This is of course due to the time taken
to fully charge C5 via R7. No trace of hum or ripple can be seen here on
the ‘scope. C2 is used to ensure stability at RF. The DC supply is
also used to run the valve heater. The ECC82 has an advantage here in
that its heater can be connected for operate from 12.6 V.
To run
it T4 is used as a series pass element. Base voltage is obtained from
the emitter of T5. T4 has very low output impedance, about 160 mR and
this helps to prevent extraneous signals being picked up from the
heater wiring. Connecting the transistor base to C5 also lets the valve
heater warm up gently. A couple of volts only are lost across T4 and
although the device runs warm it doesn’t require a heat-sink.
Wednesday, November 20, 2013
Low Current Relay
This low current relay circuit is designed to be used in battery operated electronic devices. Its operating current is in micro amperes (µA). This is done by using a bistable relay and adding some components to force the relay to behave like a monostable relay.
A bistable relay stays at its last state when the power is turned off but consume at least 50mA trigger current. A monostable relay switches back to its original state when the power is turned off.
How does the low current relay works?
When the power is turned ON, the C1 charges via D1 and the relay coil and this current activates the relay. D1 ensures that the base of T1 is always more positive than its emitter and because of this T1 and T2 are always blocked.
Once the power is turned OFF, the emitter of T1 is coupled to the charge voltage at the positive pole of C1. Its base and the relay coil on the other hand are coupled to the negative pole of C1 and now T1 and T2 conduct, C1 can discharge through T2 and relay. The current flows to the relay coil but in reverse order so is activated to its other state.
It has the advantage of consuming little current, around 150 µA. For a reliable operation, select the relay’s operating voltage as 2/3 to 3/4 of the main power supply. For example is using a 12V power supply select a 9V relay.
Transistors replacements:
T1 = 2SA499 = BC557, BC558
T2 = 2SC734 = BC547, BC548
Low current relay switch
source:http://electroschematics.com/6546/low-current-relay/
3V to 40 Volt DC Converter Circuit
· Wide Input Voltage Range 3 V to 40 V
· Precision Internal Reference 2%
· High Output Switch Current Up to 1.5 A
· Short-Circuit Current Limiting
· Adjustable Output Voltage
· Low Standby Current
· Oscillator Frequency Up to 100 kHz
Automatic Emergency Lamp Circuit
Automatic Emergency Lamp Circuit |
Tuesday, November 19, 2013
Simple Stabilizer Circuit Diagram
A aerial affection ability accumulation with a continuously capricious stabilised achievement adjustable at any amount amid 0 and 30VDC. The ambit additionally incorporates an cyberbanking achievement accepted limiter that finer controls the achievement accepted from a few milliamperes (2 mA) to the best achievement of three amperes that the ambit can deliver.
This affection makes this ability accumulation basal in the experimenters class as it is accessible to absolute the accepted to the archetypal best that a ambit beneath analysis may require, and ability it up then, after any abhorrence that it may be damaged if article goes wrong. There is additionally a beheld adumbration that the accepted limiter is in operation so that you can see at a glance that your ambit is beyond or not its preset limits.
Hall Effect Sensors Magnetic Field
Hall Effect Sensor Type UGN3503U |
One example is a sensor hall effect sensor UGN3503U. UGN3503U sensor will produce a voltage proportional to the strength of the magnetic field detected by the sensor UGN3503U. UGN3503 sensor has 3 pins, namely:
Hall Effect Sensor Block Diagram UGN3503U
Pin 1: VCC, supply voltage pin
Pin 2: GND, pin grounded
Pin 3: Vout, the output voltage pin.
Battery Charger using LM317 Regulator
Part List:
LM317
R1 - see the values in table below
R2 - 2.2 kilo-ohms 1/4W
C1,C2 - 47uF/25V, or any value will do, the higher the better
D - 1N4001 or any similar diode at-least 1A rated
Simple Metal Detector Using 555 Timer
Metal Detector with 555 Timer Circuit Daigram
Monday, November 18, 2013
Hearing aids circuit
Fire Sensor Hamamatsu UVTRON
100W BTL TDA2030 amplifier circuit
TDA2030 100W amplifier circuit |
Sunday, November 17, 2013
Mini 2x75W Stereo Power Amplifier
Stereo Low power audio amplifier
C1 = 1uF
C2 = 100uF
C3 = 100uF
C4 = 100uF
C5 = 0.1uF
C6 = 470uF
C8 = 100uF
C10 = 100uF
C12 = 470uF
Create a electric shock resistant tool
Saturday, November 16, 2013
Volume Controller Equalizer Using LM1036
Volume Controller Equalizer Circuit Using LM1036