Mutchus

Description  The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED. Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470 ohm resistor while the buffer output is at +1.5 volts. When the buffer output switches to ground (zero volts) the charged capacitor is placed in series with the LED and the battery which supplies enough voltage to illuminate the LED. The LED current is approximately 3 mA, so a high brightness LED is recommended. In the other two circuits, the same voltage doubling principle is used with the addition of a transistor to allow the capacitor to discharge ...

The strength supply routine structure is developed as a resource of continuous present with adverse heat range coefficient. Transistor Q1 (BD 140) is used as a heat range indicator. transistor Q2 is used to avoid the strength supply from discharging through R1 when strength is out of stock. Getting routine is developed depending on the LM350 present regulator IC. The result present of the battery charger can be altered between 13-15 V by various the POT R6. LM350 will try to keep the present decrease between the feedback pin and result pin at a continuous value of 1.25V. So there will be a continuous present circulation through resistor R1. Q1 act here as a heat range indicator with the help of R6/R3/R4 elements that are more or less manages the platform present of Q1. As relationship emitter / platform of transistor Q1, the same as other semiconductors, containing the heat range coefficient of-2mV / ° C, the present result will also display a bad heat range coefficient. This one is ju...

This amplifier circuit or with it based on ic KA2210 main amplifier, audio amplifier circuit should disupplay minimum of 10 Volt and up to 16 volts. Power output is 2 x 5.5 W stereo amplifier att. By using this amplifier you can listen to the strains of songs from mp3 player, iPod, etc. This is schematic diagram Part List R1 = 4.7R R2 = 4.7R C1 = 1uF C2 = 100uF C3 = 47uF C4 = 100uF C5 = 0.1uF C6 = 1000uF C7 = 1uF C8 = 100uF C9 = 47uF C10 = 100uF C11 = 0.1uF C12 = 1000uF IC = KA2210

This is a simple audio Milli volt meter circuit diagram . This Audio Milli Volt Meter Circuit has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. The upper limit remains the same on tbe less sensitive ranges, but the lower frequency limit covers under 1 Hz. Simple Audio Milli Volt Meter Circuit Diagram

When a discharged gel cell is connected, the charger goes into a fast charge mode at a fixed rate of 400 ma. After the chip detects the voltage leveling off or when 4 1/2 hours has elapsed. (which ever happens first.) the fast charge will stop. After the fast charge has ended, the IC goes into a trickle charge rate of about 50 ma. This trickle charge continues until 13.8 volts is reached which will stop all charging current since the cell is now fully charged. If the cell voltage should drop for any reason, either a fast charge or trickle charge (IC will detect what is needed) will start again. 12 Volt Gel Cell Charger Circuit Diagram When constructing this circuit, be sure to attach a small heat sink to Q1. Apply a DC (partially filtered) voltage of at least 15.3 volts. The voltage must never go below this level even under load conditions. Many of the DC wall transformers available will work just fine as long as they meet the minimum voltage requirement. The input voltage can be as hi...

This Circuit is used to supply 12V Circuits in the D.C rating. This circuit uses a 12V / 5A transformer. One resistor is used to reduce the current for the LED light. This circuit uses 4 diodes and 2 high uF capacitors for a clean output. 12 Volt D.C. Power Supply Circuit Diagram: By: Roger Maxwell Email: Maxwell@cwjamaica.com   

A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it is. It uses a normal 120 to 6V stepdown transformer in reverse to step 12V to about 350V to drive a lamp without the need to warm the filaments. Parts: C1 100uf 25V Electrolytic Capacitor C2,C3 0.01uf 25V Ceramic Disc Capacitor C4 0.01uf 1KV Ceramic Disc Capacitor R1 1K 1/4W Resistor R2 2.7K 1/4W Resistor Q1 IRF510 MOSFET U1 TLC555 Timer IC T1 6V 300mA Transformer LAMP 4W Fluorescent Lamp MISC Board, Wire, Heatsink For Q1 Notes: Q1 must be installed on a heat sink. A 240V to 10V transformer will work better then the one in the parts list. The problem is that they are hard to find. This circuit can give a nasty (but not too dangerous) shock. Be careful around the output leads.

Build a simple audio Milli volt meter circuit diagram . This Audio Milli Volt Meter Circuit has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. The upper limit remains the same on tbe less sensitive ranges, but the lower frequency limit covers under 1 Hz. Simple Audio Milli Volt Meter Circuit Diagram Sourced By : http://circuitsdiagram-lab.blogspot.com/2013/11/simple-audio-milli-volt-meter-circuit.html

This adapter circuit can deliver up to 3A output voltage of 12V. The circuit can be used in cases when a current of more than 3A is required for the controller. IC regulators such high current rating are quite hard to find. The T1 transformer steps down the voltage of the rectifier bridge 12rms and D1 to produce a rectified voltage. The C1 filters the output of the rectifier produces a DC level. The passage of the series transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since D1 is Zener breakdown region of the voltage across it is 12V. So the total output voltage of 12.7 V is constant (in theory). Zener voltage which is the most base emitter voltage of transistor Q1 Q1.Here take out the excess power needed. Notes . If 12V zener is not available ,use the nearest value. The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer. The capacitors must be rated at least 25V. By changing the value of the Zener diode, different output voltages can be obtained f...

10 Amp 13.8 Volt Power Supply Circuits Diagram I actually activated this and advisedly destroyed several 2N3055’s by shorting the emitters to ground. In all cases the transistors opened up and no beneficiary to emitter abbreviate occurred in any transistor. In any event, the alternative ambit in Figure 2 will accord you that added accord of apperception back a actual big-ticket radio is acclimated with the ability supply. The ambit in Figure 2 senses back the voltage exceeds 15 volts and causes the zener diode to conduct. Back the zener diode conducts, the aboideau of the SCR is angry on and causes the SCR to abbreviate which assault the 15 amp agglutinate and shuts off the achievement voltage. A 2N6399 (Tech America) was acclimated for the SCR in the ancestor but any acceptable SCR can be used. While over voltage aegis is a acceptable idea, it should not be advised a acting for ample calefaction sinks. I alone feel the best aegis from over voltage is the use of ample calefaction sink...

The circuit above get from -20 volt DC the rectifier diode which is fed to the collector of the Darling pn pass transistor , a TIP105 . The diode use IN4007. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP105 is driven from Vz terminal at pin 9 , which is the anode of a 6.2 -V zener diode that connects to the emitter of the uA723 output control transistor. The method of providing the positive feedback required for foldback action is shown. This technique introduces positive feedback by increased current flow through resistor R1 and R2 under short circuit conditions. This forward biases the base emitter junction of the 2N2907 sensing transistor , which reduces base drive to the TIP105.

An increasing number of appliances draw a very small current from the power supply. If you need to design a mains-powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance’s total power consumption is very small? Transformer-based power supplies are bulky, while the switchers are generally made to provide greater current output, with a significant increase in complexity, problems involving PCB layout and, inherently, reduced reliability. Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant...

Quickly find a reliable and cost effective a simple regulated 12 Volt power supply  Notes: This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Approximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zen-er circuit .  

In this time I will share about the circuit voltage stablizer or stabilization using IC 7815 and 7915, with a minimum of 17.5V to 50V input. The output of this circuit will issue with the current 15V voltage in accordance with the input. Stabilizer is also equipped with reinforcement by transistor 2N3055 and MJ2955. 15V stabilizer schematic Part List : D1 - D4 use 3A diode C1 - C2 use Capacitor Elco with capacity 4700uF - 10000uF 80V C3 - C6 use Capacitor Elco with capacity 470uF - 2200uF 50V Q1 2N3055 Q2 MJ2955 IC 7815 and 7915