Secret Diagram: watt

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Wednesday, 15 March 2017

22 Watt Car Subwoofer Amplifier

22W into 4 Ohm power amplifier, Variable Low Pass Frequency: 70 – 150Hz

This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated loudspeaker. The power amplifier used is a good and cheap BTL (Bridge Tied Load) 13 pin IC made by Philips (now NXP Semiconductors) requiring a very low parts count and capable of delivering about 22W into a 4 Ohm load at the standard car battery voltage of 14.4V.
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Circuit diagram:

22 Watt Car Subwoofer Amplifier Circuit Diagram

Parts:

P1_____________10K Log Potentiometer
P2_____________22K Dual gang Linear Potentiometer
R1,R4___________1K 1/4W Resistors
R2,R3,R5,R6____10K 1/4W Resistors
R7,R8_________100K 1/4W Resistors
R9,R10,R13_____47K 1/4W Resistors
R11,R12________15K 1/4W Resistors
R14,R15,R17____47K 1/4W Resistors
R16_____________6K8 1/4W Resistor
R18_____________1K5 1/4W Resistor
C1,C2,C3,C6_____4µ7 25V Electrolytic Capacitors
C4,C5__________68nF 63V Polyester Capacitors
C7_____________33nF 63V Polyester Capacitor
C8,C9_________220µF 25V Electrolytic Capacitors
C10___________470nF 63V Polyester Capacitor
C11___________100nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
D1______________LED any color and type
Q1,Q2_________BC547 45V 100mA NPN Transistors
IC1___________TL072 Dual BIFET Op-Amp
IC2_________TDA1516BQ 24W BTL Car Radio Power Amplifier IC
SW1____________DPDT toggle or slide Switch
SW2____________SPST toggle or slide Switch capable of withstanding a current of at least 3A
J1,J2__________RCA audio input sockets
SPKR___________4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio. Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.

Notes:

IC2 must be mounted on a suitable finned heatsink
Due to the long time constant set by R17 and C9 in the dc voltage stabilizer, the whole amplifier will become fully operative about 15 - 30 sec. after switch-on.

Technical data:

Output power (1KHz sinewave):
22W RMS into 4 Ohms at 14.4V supply
Sensitivity:
250mV input for full output
Frequency response:
20Hz to 70Hz -3dB with the cursor of P2 fully rotated towards R12
20Hz to 150Hz -3dB with the cursor of P2 fully rotated towards R11
Total harmonic distortion:
17W RMS: 0.5% 22W RMS: 10%

Readmore → 22 Watt Car Subwoofer Amplifier

Saturday, 14 January 2017

1 watt 10km FM Transmitter Circuit

      In this article we learn about a 1 Watt FM Transmitter amplifier with a reasonably balanced design specified to boost a RF frequency in the 88 – 108 MHz spectrum.

      It may be considered a fairly sensitive configuration when used with quality RF power amplifier transistors, trimmers and inductors. It involves a power amplification factor of 9 to 12 dB (9 to 15 times). At an input power of 0.1W the output may be well over 1W. It's advisable to choose T1 transistor on the basis of the fed voltage. Considering you possess a 12V power supply in that case using transistors like: 2N4427, KT920A, KT934A, KT904, BLX65, 2SC1970, BLY87. At 18 to 24V inputs you may want to use transistors such as: 2N3866, 2N3553, KT922A, BLY91, BLX92A. You could also consider using 2N2219 at 12V However that would yield just an output power of 0.4W at the fullest.

How to Calibrate this 1 watt fm power amp

Initially don't apply any sort of RF input, simply use the power and check with a meter the voltage at point 1. Calibrate R3 as you get the reading near about 0.7V. Use the antenna with a 2 x 100 Ω 0.5W resistors in parallel at the RF output. After this attach the rf source that may be supposed to boost and link up this RF input to the output.
Carefully set up C1 so as to extract the most optimal potential magnitude on the rf link. Next up, rotate R3 once more to acquire 0.7 V at point 1. Finally set up C5 and C6 for ensuring the highest output voltage (quite between 12V to 18V).

Verify the dissipation of T1′s heatsink, if you see it to be just fine switch off the power, isolate and pull of the 2 resistors of 100 Ω and connect back the antenna (make sure the the probe stays connected). Connect again the power and yet again allign C1, C5 and C6 for highest voltage read on the probe.

You could think of using a an ammeter for enabling reading the current incourse via T1. This must be restricted below 150mA at 12V and 100mA at 24V otherwise the transistor may well fry of. L2 and L3 coils must be installed at an angle of 90 degrees between the two. Don’t run the 1W rf fm amplifier in case you witness your TV set is getting jammed and perhaps the laws of the your country prohibits the use of such FM transmitters.

BOM for the above 10km FM transmitter

R1 = 100 Ω
R2 = 2.2K Ω for 12 V and 4.7 kΩ for 24 V
R3 = 10 KΩ
R4 = 100 Ω
C1 = C5 = C6 = 10 – 60 pF
C2 = C4 = 1 nF
C3 = 10 uF
D1 = 1N4148
L1 = 20 turns of 0.2mm super enameled wire over R4
L2 = 7 turns of 0.8mm super enameled wire with 6mm diameter on air
L3 = 4 turns of 0.8mm super enameled wire with 7mm diameter on air
T1 = 2N4427, KT920A, KT934A, KT904, BLX65, 2SC1970, BLY87 (2N2219, output of 0.4W) at 12V
T1 = 2N3866, 2N3553, KT922A, BLY91, BLX92A at 24V

Readmore → 1 watt 10km FM Transmitter Circuit

Friday, 6 January 2017

24 W BTL or 2 x 12 watt stereo amplifier

GENERAL DESCRIPTION:

The TDA1518BQ is an integrated class-B output amplifier in a 13-lead single-in-line (SIL) plastic power package. The device is primarily developed for car radio applications.

FEATURES:

Requires very few external components
Flexibility in use  stereo as well as mono BTL
High output power (without bootstrap)
Low offset voltage at output (important for BTL)
Fixed gain
Good ripple rejection
Mute/stand-by switch
Load dump protection
A.C. and d.c. short-circuit-safe to ground and VP
Thermally protected
Reverse polarity safe
Capability to handle high energy on outputs (VP = 0 V)
No switch-on/switch-off plop
Flexible leads
Low thermal resistance
Identical inputs (inverting and non-inverting)
Compatible with TDA1516BQ (except gain).

Circuit diagram:

Circuit diagram for mono amplifier TDA1518

Circuit diagram for stereo amplifier TDA1518

Datasheet for TDA1518: Download

Readmore → 24 W BTL or 2 x 12 watt stereo amplifier

Friday, 23 December 2016

40 Watt Fluorescent Lamps Diagram Schematics

This is a Circuits of fluorescent lamp with a power of 40 Watt - The ambit works abundant like the aboriginal Strobos. except that a beaming tube is used. Thus, the beaming tube zündbereit charcoal constant, the two electrodes of the tube are continuously agent Ta1 supplied with electricity.

Click To view larger | 40 Watt Fluorescent Lamps Diagram Schematics

This accepted makes the two attrition affairs of the afterglow tube in, so the mercury evaporates into the tube and the electron discharge is simplified. Ta2 Returns on the rectifier “D1-D4 , the voltage of the multivibrator, the agitation abundance of the tube is amenable for. The acceleration of the AMV is with potentiometer P1 set. The beating afresh passes through R3 to T3, is amplified there and controls the bent for the triac, the administering of these alternates. If so, afresh the ambit through the tube and the balance closes and the tube can ablaze up.

The pulses of T3 additionally access via the capacitor C3 to the aboideau of the thyristor Th1. Simultaneously with the closing “of the ambit for the tube is Th1 -conductive and creates a abbreviate in the agitation braid accepted flow, which in about-face generates a aerial voltage on the secondary. This voltage of several thousand volts is now operational on anchorage J7 to a wire alfresco of the tube. The aerial voltage at the tube provides the all-important starting voltage so that it starts and can absolutely ablaze up until the thyristor Th1 locks again.

Part List:

C1/C2 2x Elco standing 1μF/16V

C3 1x Ker. Scheibenkondens. 0.1 μF

C4 1x HV-capacitor 1μF 350V axial

C5 1x Elko stand. 470μF 25 V

C6 1x Poly condensation. 0.068 μF 630V

D1-4 4x Diode 1N4001

D5 1x Diode 1N4007

L1 1x Ignition coil (such as the normal speed camera strobe)

P1 1x Poti 6mm 2.2 M

R1/R4 2x Resistor 470R 1 / 4 W

R2/R9 2X Resistor 47K 1 / 4 W

R3 1x Resistor 10K 1 / 4 W

R5 1x Resistor 270R 1 / 4 W

R6 1x Resistor 1.2 K 1 / 4 W

R7 1x Resistor 22K 1 / 4 W

R8 1x Resistor 120K 1 / 4 W

Si1 1x Backup medium time 160mA

Si2 1x A pair of fuse holders

T1/T2 2x Transistor BC557B

T3 1x Transistor BC547B

Ta1 1x Transformer 2x 2x 5V 500mA 5VA

TA2 1x Trafo 1,2 VA 9Volt

Th1 1x Thyristor 4A 400V T0220

TR1 1x Triac 4A 400V T0220

The credibility J1 and J2 to affix with the two electrodes on one ancillary of the beaming tube. The credibility J3 and J4 , affix with the electrodes on the added side. Now amplitude a attenuate insulated!! Wire forth the tube and cement it eg. Scotch band firmly. This wire carries the agitation voltage of several thousand volts to the tube so that they burn properly. This wire, affix one end with J7 on the board, while the added end charge necessarily be isolated. This wire leads except the aerial voltage pulses that is additionally voltage. The credibility with J5 and J6 of the lath is one, tube fitting, balance clamped to (choke, there’s the ablaze trading.) Finally there is the voltage at J8 and J9. Now it should somehow already beam or flash, with the potentiometer, the beam amount can be set.

40 W Fluorescent Lamps Diagram Schematics

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Friday, 16 December 2016

Simple 2 Watt Small Switching Power Supply Circuit Diagram

In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.

2 Watt Small Switching Power Supply Circuit Diagram

The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts. Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode. The efficiency is about 80% using a high Q inductor.

Readmore → Simple 2 Watt Small Switching Power Supply Circuit Diagram

Thursday, 8 December 2016

40 Watt Audio Amplifier Circuit

General Description

The TA8277H is 4 ch BTL audio power amplifier for car audio application. This IC can generate more high power: POUTMAX = 43 W as it is included the pure complementary PNP and NPN transistor output stage. It is designed low distortion ratio for 4 ch BTL audio power amplifier, built-in stand-by function and muting function. Additionally, the AUX amplifier and various kind of protector for car audio use is built-in.

Circuit Diagram:

40 Watt Audio Amplifier Circuit

Datasheet for TA8277: Download

Readmore → 40 Watt Audio Amplifier Circuit

Wednesday, 30 November 2016

47 Watt BTL Audio Power Amplifier 4 channel

General Description:

The TA8273H is 4 ch BTL audio power amplifier for car audio application. This IC can generate more high power: POUTMAX = 47 W as it is included the pure complementary PNP and NPN transistor output stage. It is designed low distortion ratio for 4 ch BTL audio power amplifier, built-in stand-by function, muting function, and diagnosis circuit which can detect output to VCC/GND short, output offset voltage and over voltage input mode. Additionally, the AUX amplifier and various kind of protector for car audio use are built-in.

Circuit Diagram:

47 Watt BTL Audio Power Amplifier 4-channel

Datasheet for TDA8273: Download

Readmore → 47 Watt BTL Audio Power Amplifier 4 channel

Saturday, 26 November 2016

TDA2005 2 X 20 Watt Power Amplifier

This time, there is a series of audio amplifer 20W as well, but using IC TDA 2005 as a series of his base amplifier.
The series of 2x20 Watt Audio Power Amplifier using TDA2005 can you see in the picture below.

Technical Data:

Performance of TDA2005M: (for this circuit); At 4.14 V supply voltage: 2 x 20 watts (stereo) into 4 Ohms.

Distortion: Approx. 0.2% at 4 Watts into 4 ohm load.

Frequency Range: Approx. 20 Hz to 22 KHz.

Input Sensitivity: Approx. maximum 150 mV rms. .

Power supply: + 8 to 18 volts, approx. 3.5 Amps maximum per channel.

Readmore → TDA2005 2 X 20 Watt Power Amplifier

Sunday, 20 November 2016

3 Watt stereo amplifier circuit

3 Watt stereo amplifier circuit using MAX 7910 IC. The MAX9710 a stereo audio power amplifier IC capable of delivering 3Watts of out put to 4 Ohm loads. MAX9710 can be operated from a single 4.5V to 5.5V power supply , makes it ideal for hand held applications.The IC for 3 Watt stereo amplifier circuit also features thermal overload protection.

Circuit Schematics 3 Watt Stereo Amplifier MAX 7910

3 Watt stereo amplifier circuit

This 3 Watt stereo amplifier circuit is suitable for small power audio devices such as radio sets and portable CD players. 5 V DC power supply is used for powering the 3 Watt stereo amplifier circuit. 6V battery with an IN 4007 diode series to the positive terminal of it can also be used instead of 5 V DC supply. The 3 Watt stereo amplifier circuit will get a supply voltage approximately 5 V after 0.7 V voltage drop across diode.

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