Schematic & Wiring Diagram

Download the datasheet document of KA2211 HERE

• Requires very few external components
• Low offset voltage between output and ground
• Input muted during power-on and off
• (no switch-on or switch-off clicks)
• Hi-fi according to IEC 268 and DIN 45500
• Excellent gain balance between channels
• Short-circuit-proof
• Thermally protected

• R1 and C1 determine length of output pulse where t=R1xC1 and R1 is in ohms and C1 is in farads.
• Pin 4 is the RESET. Leave it connected to power supply (+V) during normal operation. Bring pin 4 AND pin 2 low at the same time to reset timing cycle.

This is the diagram of simple portable amplifier circuit. This amplifier circuit build based on IC TEA2025 that is a monolithic integrated audio amplifier of 16-pin plastic dual in line package built by UTC manufacture. The circuit has an internal thermal protection. The circuit designed for portable cassette players and radios. You can also use as PC audio amplifier.

Here the amplifier diagram for stereo audio input/output:

and here the amplifier with mono audio input/output (bridge):

Stereo per channel
VCC=9V; RL=4 ohm/3W
VCC=9V; RL=8 ohm/2W

Bridge Application
VCC=9V; RL=8 ohm/5W
VCC=9V; RL=4 ohm/8W

Supply Voltage min = DC3v @ 500mA
Supply Voltage max = DC12v @ 500mA
Supply Voltage recommended = DC9v @500mA

Download TEA2025 Datasheet
Download the schematic diagram in PDF format HERE

Guitar Amplifier Circuit Diagram 100W

The ability amp lath has remained banausic back it was aboriginal appear in 2002. It absolutely isn’t broken, so there’s no acumen to fix it. The photo beneath shows a absolutely accumulated lath (available as apparent as M27). Application TIP35/36C transistors, the achievement date is advisedly massive overkill. This ensures believability beneath the best backbreaking date conditions. No amplifier can be fabricated allowed from everything, but this does appear close.

The ability amp (like the antecedent version) is about based on the 60 Watt amp ahead appear (Project 03), but it has added accretion to bout the preamp. Other modifications accommodate the abbreviate ambit aegis – the two little groups of apparatus abutting to the bent diodes (D2 and D3). This new adaptation is not massively altered from the original, but has adjustable bias, and is advised to accommodate a “constant current” (i.e. aerial impedance) achievement to the speakers – this is accomplished application R23 and R26. Note that with this arrangement, the accretion will change depending on the amount impedance, with lower impedances giving lower ability amp gain. This is not a problem, so may cautiously be ignored.

Should the achievement be shorted, the connected accepted achievement appropriate will accommodate an antecedent akin of protection, but is not absolutely foolproof. The abbreviate ambit aegis will absolute the achievement accepted to a almost safe level, but a abiding abbreviate will account the achievement transistors to abort if the amp is apprenticed hard. The aegis is advised not to accomplish beneath accustomed conditions, but will absolute the aiguille achievement accepted to about 8.5 Amps. Beneath these conditions, the centralized fuses (or the achievement transistors) will apparently draft if the abbreviate is not detected in time.

High Frequency Waveform Generator Circuit Diagram

High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function.

The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator.

• The circuit can be used to generate square wave, triangle, or sine wave by programming the pin inputs (A0:pin 3, A1:pin 4).
  • A0 A1 WAVEFORM
  • X 1 Sine wave
  • 0 0 Square wave
  • 1 0 Triangle wave
• The frequency can be controlled using current. If we disconnect the 20k RIN from REF (pin 1) and connect it to a DAC, then we can control the frequency using microcontroller or digital interface. We can even control the chip using a quartz crystal (PLL) by controlling the current using a phase comparator output that compares the sync output (pin 14 of MAX038) and a reference clock from quartz crystal oscillator.

This waveform generator integrated circuit chip is very interesting since it can generate 0.1Hz to 20MHz, very wide operating frequency, as expected for every waveform generator instruments.

4 Transistor 500mW FM Transmitter Circuit Diagram

As shown, the audio ascribe is a microphone, which uses 2 x 2N3904 as the microphone audio preamplifier. The audio/mic ascribe akin is adjustable by agency of a 5k preset / potentiometer.

The ambit uses a Colpitts oscillator for abundance generation, which is chargeless active and operates at the axiological abundance i.e. no circuitous abundance multiplication or control. The abundance affability basic of the ambit consists of 2 5pF (picoFarad) capacitors and a distinct 10uH (micro-Henry) inductor. These apparatus can be adapted if a change in abundance is appropriate - conceivably alike replaced with capricious capacitors (if you're up to the challenge).

An achievement RF amplifier takes the abundance produced by the Colpitts oscillator and amplifier to about about the 500mW (0.5 Watt) ambit - so this is the almost achievement ability of this FM transmitter. You are brash that back this transmitter operates at the axiological frequency, and because there is no achievement filter, there is acceptable to be some abundance alluvion and harmonics/spurious emissions.

Microphone Pre-Amplifier 9-12Volt Discrete

This is a microphone pre-amplifier ambit that use detached components. The accretion of this ambit is 100 and should be abundant for best microphones. It is set by the arrangement of the 10k resistor to the 100R. As common-emitter amplifiers, This ambit uses two anon accompanying transistors. Here is the schematic diagram of circuit:

Please agenda that this ambit has no bent voltage source, so you can’t use with condenser blazon microphones. You can use this ambit with activating blazon microphone, or condenser electret bore with alive ambit central (any microphone which is able with array central can be used).

Multi-Band AM DSB Transmitter Circuit Shcematic

The ambit of AM transmitter is advised to address (amplitude modulated) DSB (double ancillary band) signals. A articulate AM arresting consists of a carrier and two symetrically spaced ancillary bands. The two ancillary bands accept the aforementioned amplitude and backpack the aforementioned information. In fact, the carrier itself coveys or carries no information. In a 100% articulate AM arresting 2/3 rd of the ability is ashen in the carrier and alone 1/6th of the ability is independent in anniversary ancillary band.

In this transmitter we abolish the carrier and transmitt alone the two ancillary bands. The able achievement of the ambit is three times that of an agnate AM transmitter.

Op Amp IC741 is acclimated actuality as a microphone amplifier to amplify the articulation best up by the condenser microphone. The achievement of the op amp is fed to the bifold counterbalanced modulator (DBM) body about four IN4148 diodes. The accentuation akin can be adapted with the advice of preset VR1.

The carrier is generated application clear oscillator active about BC548 transistor T2. The carrier is added amplified by transistor T1, which additionally acts as a absorber amid carrier oscillator and the counterbalanced modulator. The alive abundance of the transmitter can be afflicted by application crystals of altered frequencies. For multi abundance operation, alternative of altered crystals can be fabricated application a selector switch.

Ths achievement of the DBM contains alone the artefact (of audio and carrier) frequencies. The DBM suppresses both the ascribe signals and produces bifold ancillary bandage suppressed carrier (DSBSC) at its output. However, back the diodes acclimated in the counterbalanced modulator are not absolutely matched, the achievement of the DBM does accommodate some balance carrier. This is accepted as carrier leakage. By adjusting the 100 ohm preset VR2 and trimmer C7 you can absent the carrier leakage.

To accept DSB signals you charge a exhausted abundance oscillator to reinsert the missing carrier. If you don't accept a exhausted abundance oscillator, or appetite to transmitt alone AM signal, acclimatize preset VR2 to aperture some carrier so that you can accept the signals on any accustomed radio receiver. In AM approach 100% accentuation can be accomplished by adjusting preset VR1 and VR2.

The DSBSC arresting accessible at the achievement of the counterbalanced modulator is amplified by two stages of RF beeline amplifiers. Transistor 2N2222A (T3) is acclimated as an RF pre amplifier, which provides abundant arresting addition to drive the final ability amplifier body about transistor SL100B. The achievement of the final ability amplifier is affiliated to the antenna.

All coils are to be anguish ferrite balun amount (same as acclimated in TV balun agent of admeasurement 1.4 cm * 0.6 cm) application 24 swg enameled chestnut wire. Proper calefaction bore should be provided for SL100B transistor acclimated as final ability amplifier.

Anti-Log Converter Schematic Circuits

Anti-log or exponential bearing is artlessly a amount of rearranging the logarithmic circuitry. The ambit diagram beneath shows the chip of the log adapted to accomplish an exponential achievement from a beeline input.

The emitter of Q2 in admeasurement to the ascribe voltage is apprenticed by amplifier A1 in affiliation with transistor Q1. The beneficiary accepted of Q2 varies exponentially with the emitter-base voltage.

USB-FX2 USB-2.0 interface board circuit schematic

There are some things one should be aware of when building the design above:

• Resonator: According to the data sheet, the FX2LP has an on-chip oscillator circuit which requires an external 24MHz (±100ppm) parallel resonant, fundamental mode crystal with 500uW drive level and 12pF (5% tolerance) load capacitors. So, you can't just put any 24MHz crystal there but things don't seem to be as critical as one may expect. I'm using a 24MHz fundamental mode crystal (24-MA505 from Reichelt) with 10..15pF caps (or even 32pF).
  
  (Note: In the schematic above, there are 2 crystal oscillators in parallel merely to have both options on the PCB (one of them is an SMD). Only one of them is actually soldered onto the board.)
• EEPROM: You can use an optional serial EEPROM to store either USB configuration data or a complete program which is loaded into the microcontroller's RAM at startup. You can leave it away completely to use default USB config data and download firmware via the USB (thereby also changing, the config data, it's the so-called ReNumeration thingy). Note, however, that if you leave away the EEPROM, you must still put in both the 2.2k I²C bus pull-up resistors.
• PWR_SEL: For USB-powered operation (500mA max), close a jumper between pins 2 and 3, for externally powered operation, apply 5V and GND to pins 2 and 1, respectively. There is an additional 5V, 3.3V and GND power connector called PWR_HUB to connect with add-on boards.
• For 5V-to-3.3V conversion, you need to use an LDO (low-dropout regulator) like the LM2937. It should have a drop-out of 1.2V max since the USB specs allow the 5V voltage to be as low as 4.5V on the slave side.
• Of course, usual voodoo applies like putting decoupling caps near by and keeping the USB data lines short. A massive ground plane is mandatory, at least for the analog half. Forget about Cypress telling you that you need at least a 4-layer PCB. My regular 2-layer PCB (ground plane on bottom) works stable in high-speed mode even with 3m USB cable.

Car Stereo Audio Amplifier with TDA1553CQ Circuit Diagram

This is a stereo audio amplifier for your car. The ambit is powered by a distinct IC TDA1553 with some alien components, this IC will handle your stereo car audio system.

The TDA1553CQ is a caked chip class-B achievement amplifier in a 13-lead artificial DIL-bent-SIL ability package. It contains 2×22 W amplifiers in BTL configuration. The accessory is primarily developed for car radio applications.

Special features of the device are:

3-state mode switch

· standby: low supply current (<100>

Loudspeaker protection

When a short-circuit to ground occurs, which forces a DC voltage across the loudspeaker of >= V, a built-in protection circuit becomes active and limits the DC voltage across the loudspeaker to <= V. Pin 12 detects the status of the protection circuit (e.g. for diagnostic purposes).

Short-circuit protection

If any output is short-circuited to ground during the standby mode, it becomes impossible to switch the circuit to the mute or operating condition. In this event the supply current will be limited to a few milliamps.

Guitar Control Circuit Diagram

Device purpose:

This preamplifier was advised as a stand-alone carriageable unit, advantageous to ascendancy the signals generated by guitar pick-ups, decidedly the acquaintance "bug" types activated to acoustic instruments. Obviously it can be acclimated with any blazon of apparatus and pick-up.

It appearance a -10dB, 0dB and +10dB pre-set ascribe selector to acclimatize ascribe sensitivity, in adjustment to cope with about any analeptic blazon and model. a actual continued array activity is ensured by the abundantly low accepted burning of this circuit, i.e. beneath than 800µA.

Circuit operation:

IC1A op-amp is alive as an inverting amplifier, accepting its accretion set by a three means about-face inserting altered amount resistors in alongside to R4. This ascribe date is followed by an alive three-band accent ascendancy date accepting accord accretion back controls are set in their centermost position and congenital about IC1B.

Audio VU Level Meter Circuit with LM324

The 1K resistors in the circuit are capital so that the LED's about-face on at altered audio levels. There is no acumen why you can't change these resistors, although annihilation aloft 5K may account some of the LED's to never about-face on. This ambit is calmly abundant with added op-amps, and is not bound to use with the LM324. Pretty abundant any op-amp will assignment as continued as you attending up the pinouts and accomplish abiding aggregate is appropriately connected.

The 33K resistor on the schematic is to accumulate the arresting ascribe to the ambit at a low level. It is absurd you will acquisition a 33K resistor, so the abutting you can get should do. The amount of this resistor may charge to be changed, so it is best you breadboard this ambit afore absolutely amalgam it on PCB. The ambit in it's accepted anatomy will acquire band akin inputs from sources such as the aux out on a Hi-Fi, all admitting could be calmly adapted to acquire apostle inputs.

The audio + is affiliated to the capital absolute rail, while the audio - is acclimated for arresting input. The 50k pot can be acclimated to alter the acuteness of the circuit.

Car Battery Charger 12Volt Circuit Diagram

The aloft circuit claimed accept adeptness to anticipate array blackmail that accomplish electrolyte absent due to evaporation. This ambit will annihilate the problems by ecology the battery’s action of allegation through its attendant ascendancy ambit by applying a aerial allegation accepted until the array is absolutely charged. Back charging is complete, it turns on the red LED (LD2) and deactivates the charging circuit.

This ambit is fatigued to allegation 12V batteries ONLY. Certain accent should be taken back base up this circuit. They are the access of the agent to the ambit board, and those bartering accepted to the array actuality charged. These access should be fabricated with cables accepting a ample cross-sectional breadth to anticipate voltage-drop and calefaction accession back accepted flows through them.

Audio Power Amplifier 170W with LM4651 & LM4652

The aggregate of the LM4651 disciplinarian IC and the LM4652 ability MOSFET Class D ability amplifier IC provides a aerial ability amplifier solution, acceptable for self-powered speakers, subwoofers and affection car boosters.

The LM 4651 is a absolutely chip accepted beating amplitude modulator (PWM) driver, absolute undervoltage, abbreviate circuit, overmodulation, and thermal abeyance aegis circuitry. The IC appearance a standby action which shuts bottomward the beating amplitude modulation, aspersing accumulation current.

The LM 4652 is a absolutely chip H-bridge Ability Mosfet IC in a TO220 ability package. The IC has a congenital in temperature sensor to active the LM4651 back the die temperature exceeds the beginning limit.

Used together, the LM4651 and LM4652 anatomy a simple, compact, efficient, aerial affection ability audio amplifier band-aid complete with protection, commonly apparent alone in Class AB amplifiers.

Odd Block KT88 Series 1 Tube Amp-Power Supply

A schematic of the ability accumulation is apparent below. Like the amplifier schematic, the ability accumulation ambit is © OddWatt Audio and permission to host the schematic on this armpit has been provided by OddWatt Audio. You are chargeless to use the schematic for personal, non-commercial use.

Mains ability enters the amplifier through an IEC atrium amid at the rear of the amp. The IEC atrium includes a 3 Ampere agglutinate and an EMI filter. The ability agent is an OEM bogus by Edcor with ratings of 180V-0-180V at 250 mA and 12V at 4A. Ability accumulation capacitors are Panasonic ECG alternation 500 volt electrolytic and Solen Polypropyene. The ample ability resistors are Vishay/Dale wire anguish and the actual resistors are carbon film. The High-Tension (HT) accumulation is rectified with STTH5 ultrafast aerial voltage rectifiers and uses CRC filtering. A 12V DC accumulation is acclimated for the tube heaters. An adjustable adjournment ambit is acclimated to adjournment the HT accumulation on ability up.

6 Watt Audio Amplifier Schematic Circuit with TDA1519

The audio amplifier circuit is on the TDA1519 amplifier IC that is based in audio applications, which is not a aerial achievement ability can be used. The ambit TDA1519 is a ability of 2×6 watts.

The TDA1519 is an amplifier congenital Class B dual-output advance in a 9-by-line (SIL) artificial amalgamation boilerplate achievement is primarily developed for car radio applications.

Key Features of the audio amplifier IC TDA1519 are: Requires few alien components, anchored gain, acceptable bounce drive, aphasiac / standby mode, thermal protection, about-face polarity safe. Tda1519 amplifier ability rating, 14.4 volts.

1.5V Amplified Ear Circuit Diagram

Device purpose:

This circuit, affiliated to 32 Ohm impedance mini-earphones, can ascertain actual alien sounds. Useful for theatre, cinema and address goers: every chat will be acutely heard. You can additionally accept to your television set at a actual low volume, alienated to bother ancestors and neighbors. Even if you accept a faultless hearing, you may ascertain abrupt sounds application this device: a alien bird twittering will assume actual abutting to you.

Circuit operation:

The affection of the ambit is a constant-volume ascendancy amplifier. All the signals picked-up by the microphone are amplified at a connected akin of about 1 Volt aiguille to peak. In this address actual low amplitude audio signals are awful amplified and aerial amplitude ones are limited. This operation is able by Q3, modifying the bent of Q1 (hence its AC gain) by agency of R2. A noteworthy affection of this ambit is 1.5V array operation. Typical accepted drawing: 7.5mA.

Notes:

• Due to the constant-volume control, some users may consider P1 volume control unnecessary. In most cases it can be omitted, connecting C6 to C3. In this case use a SPST slider or toggle switch as SW1.
• Please note the stereo output Jack socket (J1) connections: only the two inner connections are used, leaving open the external one. In this way the two earpieces are wired in series, allowing mono operation and optimum load impedance to Q4 (64 Ohm).
• Using suitable miniature components, this circuit can be enclosed in a very small box, provided by a clip and hanged on one's clothes or slipped into a pocket.
• Gary Pechon from Canada reported that the Amplified Ear is so sensitive that he can hear a whisper 7 meters across the room.
  
  He hooked a small relay coil to the input and was able to locate power lines in his wall. He was also able to hear the neighbor's stereo perfectly: he could pick up the signals sent to the speaker voice coil through a plaster wall.
  
  Gary suggests that this circuit could make also a good electronic stethoscope.

Simple Sound-to-Light Converter Schematic Diagram

Figure 1 shows a simple ambit for converting an audio arresting (such as one that comes from the apostle terminals of a CD player). The ambit basically consists of a buffer/amplifier date and three clarify circuits: a high-pass filter, a mid-pass filter, and a low-pass filter. The achievement of anniversary clarify ambit drives a light-emitting diode of altered color.

The ascribe arresting is fed to the absorber date through C1. The ethics of RF and RV1 should be called so that the absorber is able to drive the three filters absorbed to its output. The low-frequency, mid-frequency, and high-frequency apparatus of the ascribe arresting are alone accustomed to canyon through the low-pass clarify (bottom filter), the mid-pass clarify (middle filter), and the high-pass clarify (topmost filter), respectively, appropriately amid them from anniversary other.

Changes in the achievement of a clarify account its agnate achievement LED to about-face on and off. In effect, agriculture a connected audio arresting to the ascribe of this ambit causes the LED's to 'dance'.

Part list for 12 Amp BDX33-based power supply:

• 2 x 15 volt 6+ amps

• 2 times two MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 times 3 1N5401 (1N5408) diodes.

• F1 = 1 Amp

• F2 = 15 amp

• R1 2k2 1 Watt

• R2 10k

• R3 1k 0.5 watt

• R4,R5,R6,R7 0.1 ohm 10 watt

• R8 4.7

• R9 6k8

• C1 two times 4700uF/35v

• C2 330uF/35v

• C0',C3,C4,C6,C10 100nF

• C7 330uF/25v

• C8 47nF

• C9 47uF/25v

• D1 1N5401

• D2 LED

• D3, D4, D5 1N4001

• IC1 78L15

• relay 12 volt 2x5 amp switching

• 3 darlington transistors: T0,T1,T2 = BDX-33 NPN TO-220 transistor

• Zd 8 or 9 volt, 5 watt

• P1 2k trimmer

If using a bridge rectifier (like in schematic 2) you do not need 2 x 15 volts 6 amps, but 1 x 15 volt 10+ Amps

Part list for 20 Amp BDX33-based power supply:

• 2 x 15 volt 12+ amps

• 2 times 3 MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 times 5 1N5401 (1N5408) diodes.

• F1 = 2 Amp

• F2 = 25 amp

• R1 2k2 1 Watt

• R2 10k

• R3 1k 0.5 watt

• R4,R5,R6,R7 0.1 ohm 10 watt

• R8 4.7

• R9 6k8

• C1 22000uF/35v

• C2 330uF/35v

• C0',C3,C4,C6,C10 100nF

• C7 330uF/25v

• C8 47nF

• C9 47uF/25v

• D1 1N5401

• D2 LED

• D3, D4, D5 1N4001

• IC1 7815

• relay 12 volt 10 amp switching

• Four darlington transistors: T0,T1,T2,T3 = BDX-33 NPN TO-220 transistor

• Zd 8 or 9 volt, 5 watt

• P1 2k trimmer

If using a bridge rectifier (like in schematic 2) you do not need 2 x 15 volts 12 amps, but 1 x 15 volt 20 Amps

Audio Amplifer Circuit 230W With MOSFET IRFP240,9240

Here is simple LED-power audio amplifier ambit with MOSFET amplifier TL071C and 2 may be up to 45 W into 8 ohms. For MOSFET IRFP240 and IRFP9240 are acclimated assurance with accessory can now be these modification.

The arrangement is at the appeal SILICONIX and the voltage change of 2 consecutive resistances from suppliers operating voltage amplifier disciplinarian was inserted. MOSFET charge be army on at atomic one condenser 1K / W.

Amplifier ability is 70%, the abridgement in the abundance baloney in added than 0.2% at 20 Hz at 8 ohms and 10W. With a accumulation voltage in the ambit of + – 30V, can accumulation audio amplifier MOSFET 45W into 8 ohms and 70W into 4 ohms. Remember that the complete amplifier is short, so all you can analysis the radio button is protected, whether the apostle is connected.

• 25W OUTPUT POWER: RL = 8 ohm/4 ohm; THD = 10%
• HIGH EFFICIENCY
• WIDE SUPPLY VOLTAGE RANGE (UP TO ±25V)
• SPLIT SUPPLY
• OVER-VOLTAGE PROTECTION
• ST-BY AND MUTE FEATURES
• SHORT CIRCUIT PROTECTION
• THERMAL OVERLOAD PROTECTION