Mutchus

  The below circuit is a Simple Lithium Ion Charger 2 Cell Circuit Diagram. This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio. The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input voltage. When the battery is low, the current pulses are spaced close together so that a somewhat constant current is present. As the batteries reach full charge, the pulses are spaced farther apart and the full charge condition is indicated by the LED blinking at a slower rate. Simple Lithium Ion Charger 2 Cell Circuit Diagram A TL431 , band gap voltage reference (2.5 volts) is used on pin 6 of the comparator so that the comparator output will switch low, triggering the 555 timer when the voltage at pin 7 is less than 2....

This circuit of power amplifiers using a booster 8 sets sanken , the buffer using transistor D400 and B560 as much 2 sets , and to use part of the driver transistor B546/A940 and D401/C2168. And least 20 volts and the voltage to 70 volts maximum with three voltage is +,-,ground. Power Output 2 X 600 Watt with 8 Ohm Impedance. Circuit audio amplifier 600 Watt Circuit of PCB so from 2  X 600 watts (looked down) Circuit of PCB (looked upon) The above is a circuit of ready to operate , just stay put booster. Source : link

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1) QUESTION: How can I select contactors for utilization categories AC-8a and AC-8b? What special features have to be observed? ANSWER: This is to confirm that all technical data of contactors as shown for AC-3 can also be used for AC-8a and AC-8b. 2) QUESTION: Is it possible to use a set of 3TF53 main contacts in a 3TF52 contactor in order to increase the electrical life of the contactor? ANSWER: The 3TF main contacts are mechanically coded and therefore cannot be interchanged within same contactor sizes. 3) QUESTION: Need confirmation that 3TF Contactors free of PVC. ANSWER: This is to confirm that the materials of 3TF contactors do not contain any PVC ....

This metal detector circuit consists of two oscillators, both working at about 465 kHz. One uses a transformer and the other uses an inductor which is the search coil LI. The oscillators are coupled through a capacitor 10 pF. The circuits DE metal detector is a BFO (beat frequency oscillator), a tone beat produced if the two oscillators are working together through the diode is detected and sent to the audio amplifier. BFO Metal detectors Circuit Diagram: The oscillator coil is tuned by a variable capacitor of 10-365 pf variable. The search coil is made of wire with 22 turns between 24 and 36 AWG enamel junction to the center. The wire should be wound on a form of about 6 "χ 6" and the phones must be high impedance.

Here i am going to present you a simple Emergency Light circuit diagram using 2 white Leds. Leds are convenient, cheap, cool and having long life. In this circuit we are using 2 Leds (white is prefered) to increase the brightness. The heart of this circuit consists of IC HEF 4093. The circuit is powered by a 9V battery. CIRCUIT DIAGRAM OF SIMPLE EMERGENCY LAMP/LIGHT COMPONENTS USED IN THE CIRCUIT IC HEF 4093 D 1N4001 R1 330KΩ R2 100Ω C 10μF Back To HOME For More

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The first thing you will notice is the clever circuitry. Some of the design goes against everything we have learnt in electronics. That’s why we have to study other people’s designs and realise “the more you know, the more you realise you don’t know.” The oscillator circuit is very interesting, but first we will look at the RF oscillator. The doorbell operates on the 303MHz band and the 30 metre range (100ft) is obtained without the use of an antenna! The circuit is actually radiating from the printed track of the tank circuit. The Tank Circuit is a single-turn coil and a small capacitor (5p & 4p in parallel). In this project we show how to add a small antenna to the circuit to get double the range – plus two other improvements to increase the range. Some of the improvements will load the circuit and alter the frequency at which it operates. Others can be done without any effect on the circuit. Fortunately, the transmitting stage is what we call “tight” and is not affected by surro...

Tiny Dew Sensor Circuit Diagram (condensed moisture) adversely affects the normal performance of sensitive electronic devices. A low-cost circuit described here can be used to switch off any gadget automatically in case of excessive humidity. At the heart of the circuit is an inexpensive (resistor type) dew sensor element. Although dew sensor elements are widely used in video cassette players and recorders, these may not be easily available in local market. However, the same can be procured from authorized service cent res of reputed companies. The author used the dew sensor for FUNAI VCP model No. V.I.P. 3000A (Part No: 6808-08-04, reference no. 336) in his prototype. In practice, it is observed that all dew sensors available for video application possess the same electrical characteristics irrespective of their physical shape/size, and hence are interchangeable and can be used in this project. The circuit is basically a switching type circuit made with the help of a popular dual...

Build a Simple Digital Electronic Lock Circuit Diagram . This is a Build a Simple Digital Electronic Lock Circuit Diagram . The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the counter will advance. Simple Digital Electronic Lock Circuit Diagram As each correct key is pressed, a low level appears at the output of the dual NAND gate producing a high level at the output of the 8 input NAND at pin 13. The momentary high level from pin 13 activates a one shot circuit which applies an approximate 80 millisecond positive going pulse to the clock line (pin 14) of the decade counter which advances it one count on the rising edge. A second monostable, one shot circuit is used to generate an approximate 40 millisecond positive going pulse which is applied...

Circuit diagram  Description This circuit is similar to the fading eyes circuit above and is used to slowly brighten and fade interior lights of older cars. The circuit is based around the LM324 low power opamp which draws around 3mA of current, so it won't bother the battery if left connected for extended periods. The top two opamps (pins 1,2,3 and 5,6,7) form a triangle wave oscillator running at about 700Hz while the lower opamp (pins 8,9,10) produces a linear, 5 second ramp, that moves up or down depending on the position of the door switch. The two transistors and associated resistors serve to limit the ramp voltage to slightly more and less than the upper and lower limits of the triangle waveform. These two signals (700 hZ. triangle wave and 5 second ramp) are applied to the inputs of the 4th opamp (pins 12,13,14) that serves as a voltage comparator and generates a varying duty cycle square wave that controls the IRFZ44 MOSFET and lamp brightness. The 5 second fade time can b...

Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer discussed here is a functional equivalent and electronic replica of the Torricelli barometer. Actually, rather than displaying the atmospheric pressure on the traditional digital displays, we preferred to reproduce the general look of this respected predecessor of electronic barometers. The mercury tube is, of course, replaced by a simple LED scale which, if not as beautiful, is still less toxic for the environment in case of breakage. As indicated on the drawing, the pressure sensor utilized is a Motorola MPX2200AP. This circuit is adapted for measuring absolute pressure and has a range well suited for atmospheric pressure. Without entering too deep into the technical details, such sensors deliver an output of voltage proportional not only to the measured pressure but, unfortunately, to their supply voltage as well. Hence they must b...

SMPS is the toughest section in Power Electronics. Tremendous knowledge is required for choosing active and passive parts for use in SMPS circuits. Special parts are often required specifically for use in SMPS. Many components that can be used for low frequency applications in Power Electronics may fail if used in SMPS circuits. When I started learning Power electronics in 2008, I placed emphasis on SMPS. Regarding SMPS, nothing was available here. I had to collect and gain everything piecemeal- knowledge, literature, active and passive parts, testing equipment etc. The main drawback was the lack of knowledge in this field. In my country, SMPS is not taught in detail in any engineering university. So, teachers are not readily available. Additionally, relevant books were also not available. So, my father chalked out a deliberate and detailed plan for me to learn SMPS: Detailed Plan for learning SMPS at home Step 1   – Collecting knowledge by collecting required books from abroa...

PCB Transfer

This is the Simple 300mA DC to AC converter Circuit Diagram. This circuit was used to provide battery backup to a device that had an AC (output)wall transformer. Due to the quasi sine-wave output and imprecise 60Hz output frequency, some devices might not work pro perly. Peak output is the DC input voltage minus about 20 ohms drop. Use bigger output MOSFETS for more current output.[link]  Simple 300mA DC to AC converter Circuit Diagram    

Description  In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TIP35 or similar). The 4th comparator is used to generate a time delay after the normally closed switch is opened. Two resistors (36K and 62K) are used as a voltage divider which applies about two-thirds of the battery voltage to the (+) comparator input, or about 2 volts. The delay time after the switch is opened will be around one time constant using a 50uF capacitor and 100K variable resistor, or about (50u * 100K) = 5 seconds. The time can be reduced by adjusting the resistor to a lower value or using a smaller capacitor. Longer times can be obtained with a larger resistor or capacitor. To ope...

This circuit uses a 555 timer that is setup to each runn in associate Astable operative mode. This generates a nonstop output via Pin three within the type of a sq. wave. once the timer's output changes to a high state this triggers the a cycle the 4017 4017 decade counter telling it to output consecutive sequent output high. The outputs of the 4017 ar connected to the LEDs turning them on and off. Schematic Parts List 1x - NE555 Bipolar Timer 1x - 4017 Decoded Decade 6x - 1N4148 Diode 1x - 1K Resistor (1/4W) 1x - 22K Resistor (1/4W) 2x - 4.7K Resistor (1/4W) 6x - 470 Resistor (1/4W) 1x - 2.2µF Electrolytic Capacitor (16V) 2x - BC547 NPN Transistor 2x - LED (Blue) 2x - LED (Red) 1x - 9V Voltage Battery