Mutchus

In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit power. The bridge rectifier should be rated at 200 volts and 5 amps or more. In operation, a 700 Hz triangle waveform is generated at pin 1 of the LM324 and a slow rising voltage is obtained at pin 8. These two signals are compared at pins 12 and 13 to produce a varying duty cycle rectangular waveform at pin 14, which controls the MOSFET and brightness of the 60 watt lamp. Sunrise Lamp Circuit Diagram:  When power is applied, the lamp will start to illuminate within a minute or so, and will slowly brighten to full intensity in about 20 minutes. You can make that longer or shorter with adjustments to the 270K resistor at pin 9. The 2.2 ohm resistor and .015uF cap connected to the lamp serve to supress RFI. The diode at pin 9 and ...

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   

This is very simple Electronic Circuit Project of High voltage supply. A 6 V battery can provide 100-150 Vdc center-tapped at a high internal impedance (not dangerous though it can inflict an unpleasant jolt). A 6.3 V transformer is connected ' 'in reverse'' with a transistor used in a Hartley oscillator configuration. The frequency of operation may be controlled by varying the value of the 10 ohm resistor. Circuit Diagram: The 10 µ¥ capacitor must have a working voltage of at least 250 Vdc.

Attention: This Circuit is using high voltage that is lethal. Please take appropriate precautions Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. How to calculate transformer rating The basic formula is P=VI and between input output of the transformer we have Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1 So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A.

A very simple and useful circuit that require few external components and operates in FM band ( above 100 MHz ). This circuit diagram transmitter needs to be powered from a 9 volts battery or from another 9 volts regulated power supply . The tuned coil L1, has two output tappings for the antenna connection, marked "A" and "B". These are both low-level outputs and you choose which tapping you want to use ( stable low range, or more unstable but higher range). Tap B (2.5%) takes just a very small portion of signal from the oscillator circuit and therefore gives a very frequency stable transmitter. The output level (around 2.5mW) and range are therefore somewhat reduced.  Tap A (10%) delivers very much more power (around 10mW) to the antenna load. This gives you a greater range, but at the expense of frequency stability. All component leads should be kept as short as possible. The LINK wire on the PCB should lay flat on the PCB. Use the cutoff from a resistor leg. Ante...

This amplifier circuit is very cheap, because not a lot of components that are required, and the voltage or amperage required is also not too large, so the transformer or power supply is also quite cheap. IC which can be used in power amplifier circuit is the KA2201, LM820M, TBA820M, U820. This amplifier output of 2 W and 4 ohm impedance, which can be applied to the speaker with 4W power, on such small speakers in front of a PC. For the required minimum input voltage of 3 volts and a maximum of 16 volts, for the recommended voltage of 12 volts. Parts Resistor R1 = 100K R2 = 120R R3 = 100R R4 = 10R Capacitor C1 = 0.1uF C2 = 100uF C3 = 47uF C4 = 100uF C5 = 470uF C6 = 220pF C7 = 100nF IC U1 = KA2201 , LM820M, TBA820M, U820

This is the Low cost LM358 op-amp Audio Amplifier Circuit Diagram. The differential inputs give the amplifier excellent immunity to common-mode signals which are a common cause of amplifier instability. The dotted ground connection represents the wiring in a typical project illustrating how the ground sensing input can be connected to the ground at the source of the audio instead of at the amplifier where high currents are present. Low cost LM358 op-amp Audio Amplifier Circuit Diagram If the source is a power supply referenced signal then one of the amplifier inputs is connected to the positive supply. For example, an NPN common-emitter preamplifier may be added for very high gain and by connecting the differential inputs across the collector resistor instead of from collector to ground, destabilizing feedback via the power supply is greatly reduced.

This Electronic Inverter Project low-cost and very simple build 500W low-cost 12V to 220V inverter circuit project. Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. 12V to 220V inverter Circuit Diagram: How to calculate transformer rating: The basic formula is P=VI and between input output of the transformer we have Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1 So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A.

This is a simple A Low Cost Hearing Aid Circuit Diagram. This low-cost, general-purpose electronic hearing aid works off 3V DC (2x1.5V battery). The circuit can be easily assembled on a veroboard. For easy assembling and maintenance, use an 8-pin DIP IC socket for TDA2822M. A Low Cost Hearing Aid Circuit Diagrams:  A Low Cost hearing Aid Circuit Parts: P1 = 10K R1 = 2.2K R2 = 330K R3 = 680R R4 = 33R R5 = 100R R6 = 4.7R R7 = 4.7R R8 = 220R C1 = 0.01uF-10V C2 = 100nF-63V C3 = 47uF-10V C4 = 10uF-10V C5 = 0.01uF-10V C6 = 100uF-10V C7 = 100nF-63V C8 = 100nF-63V D1 = Red LED Q1 = BC547 IC1 = TDA2822M EP1 = Mono Earphone 32R SW1 = On-Off Switch Circuit Operation: In this circuit, transistor Q1 and associated components form the audio signal preamplifier for the acoustic signals picked up by the condenser microphone and converted into corresponding electrical signals. Resistor R5 and capacitor C3 decouple the power supply of the preamplifier stage. Resistor R1 biases the internal circuit ...