Mutchus

This is a simple Motorcycle Alarm With Transistor Circuit Diagram . It's designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it'll protect your "Classic Bike". The standby current is virtually zero - so it won't drain your battery. Motorcycle Alarm With Transistor Circuit Diagram Any number of normally-open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. While at least one switch remains closed - the siren will sound. About one minute after all of the switches have been opened again - the alarm will reset. How long it takes to switch off depends on the characteristics of the actual parts you've used. You can adjust the time to suit your requirements by changing the value of C1 and/or R3. The circuit is designed to use ...

This circuit is a circuit diagram preamp and tone controls are combined in a single series. Series preamp and tone controls are using the transistor as a control. In the picture below P1 to control the volume level, to control the level of P2 and P3 for Bass control Treble level. This circuit is a circuit diagram mono channel, built a similar circuit to make this circuit stereo. The following is a schematic drawing: Component: R1__________220K R2__________100K R3__________2K7 R4 R5_______8K2 R6__________4K7 R7, R8, R13___2K2 R9__________2M2 R10, R11_____47K R12_________33K R14_________470R R15_________10K R16_________3K3 C1, C2, C9____470nF 63V C3, C4_______47nF 63V C5, C6_______6n8 63V C7__________10?F 63V C8, C10______22?F 25V C11_________470?F 25V Q1, Q3_______BC550C Low noise NPN 45V 100mA High gain TransistorsQ2__________2N3819 General-purpose N-Channel FET

This water sensor alarm circuit diagram is designed using common electronic components. Thewater sensor alarm circuit may operate an active buzzer, to make a sound when is reached a certain level of water. Transistor Water Sensor Alarm Circuit Diagram Because water sensor and control circuit for buzzer are located on the same printed circuit board, indicator, together with 9 V battery and buzzer can be mounted in a compact case. When water reaches the sensor, the base of T1 is connected to the positive supply terminal. Therefore, T1 and T2 are open, so that buzzer BZ1, will be activated. Sensitivity reduction of the circuit can be done by increasing the value of R2.

Practical Transistor Amplifier The below fig shows a practical single stage transistor amplifier. The various circuit elements and their functions are described below. Practical Transistor Amplifier 1.        Biasing Circuit: The resistor R 1, R 2, and R E form the biasing and stabilization circuit. 2.        Input Capacitor C in : An electrolytic capacitor C in is used to couple the signal to the base of the transistor. The capacitor C in allows only a.c. signal to flow but isolates the signal source from R 2 . If it is not used, the signal source resistance will come across R 2 and thus change the bias. Typical value of C in is 10µF. 3.        Emitter Bypass Capacitor C E : An emitter bypass capacitor C E is used in parallel with R E to provide a low reactance path to the amplified a.c. signal. If it is not used, then amplified a.c. signal flowing through R E will cause a voltage drop across i...

Photo transistor (Photo Duo Diode) A photo transistor is similarly to an ordinary bipolar junction transistor except that no base terminal is provided. Instead of base current the input to the transistor is provided in the form of light. Principle   Consider an ordinary transistor with its base terminal open circuited. The collector base leakage current I CBO will acts as base current. Since            I C = βI B + (1 + B) I CBO    And  I B = o since base is open circuited             I C = (1 + β) I CBO In photo transistor I CBO is increased when the collector base junction is illuminated. When I CBO is increased the collector current is also increased therefore for a given amount of illumination on a very small area of the photo transistor provides much largest output current. Therefore the photo transistor is a light detector which combines a photo diode ...

Experts a nd amateurs have been Experimenting with radios without batteries since the wireless communication started. In many designs we've seen radios that operate without power, but all are known to use the diode 1N34. (Crystal Radio). Although significant improvements have increased the sensitivity and selectivity of these system circuits, Performances were limited until new techniques have emerged.    Here we have the first transistor radio that works without batteries, it is powered by random electric fields are everywhere in the atmosphere.  These circuits are relatively cheap to manufacture, have more volume and better reception from the crystal radios.   This circuit is a medium wave receiver and attaches easily to frequencies from 500Khz to 11Mhz. To get good results in the reception of radio stations, we should give great importance to the ground and the antenna. To listen to distant and weak stations we have to use a battery 9volt parallel with the capaci...

This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor. ( Click here for Colpitt Oscillator Resonant Frequency Equation.) Frequency is around 100Mhz with values shown. 4 Transistor Transmitter Circuit Diagram Audio modulation is fed into the tank circuit via the 5p capacitor, the 10k resistor and 1N4002 controlling the amount of modulation. The oscillator output is fed into the 3.9uH inductor which will have a high impedance at RF frequencies. The output stage operates as a class D amplifier, no direct bias is applied but the RF signal developed across the 3.9uH inductor is sufficient to drive this stage. The emitter resistor and 1k base resistor prevent instability and thermal runaway in this stage.

Uni Junction Transistor (UJT) Basically, it is a three terminal silicon diode. As the name indicates, it has only one pn junction. It differs from an ordinary diode in that it has three terminals and it differs from a FET in that it has no ability to amplify. However, it has the ability to control a large a.c. power with a small signal. It also exhibits a negative resistance characteristics which makes it useful as an oscillator. It consists of an n-type silicon bar with an electrical connection on each end. The leads to these connections are called Base 1 B 1 and Base 2 B 2 . Partway along the bar between the two bases, nearer to B 2 than B 1 a pn junction formed. The lead of this junction is called emitter E the below Fig shows the basic structure and the circuit symbol of unijunction transistor.

Classic Tone Control Circuit with Low Noise Transistor 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. 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 circui...