My Circuit

Tone control is a type of equalization used to make specific pitches or “frequencies” in an audio signal softer or louder. A tone control circuit is an electronic circuit that consists of a network of filters which modify the signal before it is fed to speakers, headphones or recording devices by way of an amplifier.Tone control allows listeners to adjust sound to their liking. It also enables them to compensate for recording deficiencies, hearing impairments, room acoustics or shortcomings with playback equipment. For example, older people with hearing problems may want to increase the loudness of high pitch sounds they have difficulty hearing. Classic Tone Control Circuit with Low Noise Transistor Tone control is also used to adjust an audio signal during recording. For instance, if the acoustics of the recording site cause it to absorb some frequencies more than others, tone control can be used to amplify or “boost” the frequencies the room dampens. This classic tone control circuit...

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 fr...

Everyone knows the problem: you have a transistor, but you can not read the signature. Or you can not find the datasheet. You have a diode or you have a capacitor, but you can not read ... Here is the solution smarty. Michas_AVR-Transistortester Features: * Automatic detection of NPN and PNP transistors, N-and P-channel MOSFET, the diode (including the double diode), thyristor, triac and resistor. * Automatic pin detection and reporting of test components * Detect and display protection diode and the MOSFET transistor * Determination of the amplification factor and the forward base-emitter voltage of transistor * Measurement of threshold voltage and gate capacitance of MOSFET * Show the value of the text-LCD (2 × 16) * One-button operation, automatic shut-off * Power consumption in off mode: <20 nA This tester also supports measuring the diode, R / C testing, and many other components identified.

It is a simple circuit of optical index of level of sound signals, adapted in various needs of user. It can be adapted in various levels of entry, regulated from trimmer TR1 (Level) - TR2 (Gain), then it is rectified by the D1-2 (cutting off of negative periods of signal-rectification) and drived to the main circuit of index, that it is constituted by D3...D13 , the transistors Q2-Q13 and the materials that exist around them. Circuit Diagram:  The optical index him we take from the line of LED LD1-13. The each led turns on when the level is altered at 0,65V roughly. The requirements in current are 100 ma with complete index. We can add all units LED we want, always calculating the current where they will need the news LED. Parts List:

This is a class AB transistor power amplifier. It is a simple amplifier to build, uses standard parts and is stable and reliable.  The entire circuit utilizes commonly available components and may be simply built over a general-purpose board. But this amplifier has very good sound quality. There are eleven transistors, including four in the output stage. Q1 and Q2 transistor must be between 3 and 5  amperes power transistors. Q4 and Q5 must be between 100mA and 500mA driver transistors. Other transistors are 10mA small driver transistors. Q1, Q4 and Q2, Q5 are complementary pairs, they make complementary darlington pairs. PART LIST R1 1.5KΩ ¼W R2 150Ω ¼W R3 1KΩ ¼W R4 0.22Ω 2W R5 0.22Ω 2W R6 39KΩ ¼W R7 1KΩ ¼W R8 120Ω ¼W R9 6.8KΩ ¼W R10 6.8KΩ ¼W R11 47KΩ ¼W R12 47KΩ ¼W R13 2.2KΩ ¼W R14 180KΩ ¼W R15 18KΩ ¼W C1 22pF Ceramic C2 4.7µF 16V C3  1000µF 25V C4 100µF 25V D1 1N4148 D2 1N4148  Q1  2SD313  Q2  2SB507  Q3  2SA733  Q...

Ebers-Moll Model is an ideal transistor model which describes the  operating regions (states) of a transistor. This model is very useful to obtain the information about DC characteristics of a transistor. The transistor operates in active region when emitter junction is forward biased and collector junction is reverse biased. This model generalizes the behaviour of transistor by taking into account the inverted mode of operation of transistor. General Comparison of Three Transistor configurations. Device modelling aims at relating physical device parameters to device terminal characteristics. Device modelling is especially important for integrated circuits. Since simple and accurate device models are required to predict the performance of a circuit. Read More.....

Description This circuit is similar to the 3 Transistor Audio Amp but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is tied directly to the + supply. This has a disadvantage in that as the output moves positive, the drop across the 470 ohm resistor decreases which reduces the base current to the top NPN transistor. Thus the output cannot move all the way to the + supply because there wouldn't be any voltage across the 470 resistor and no base current to the NPN transistor. This circuit corrects the problem somewhat and allows a larger voltage swing and probably more output power, but I don't know how much without doing a lot of testing. The output still won't move more than a couple volts using small transistors since the peak current won't be more than 100mA or so into a 25 ohm load. But it's an improvemen...

This Treble and Bass Control without IC or Transistor circuit consists of bass and treble just a few capacitors, resistors and two potentiometers to adjust BASS and TREBLE. The circuit is very functional, can be used to adjust the small sound amplifiers. And control Treble and works relatively well. The interesting thing is that this control does not use or IC or transistor. Treble and Bass Control without IC or Transistor Circuit Diagram How to Treble and Bass Control without IC or Transistor