Secret Diagram

This is the Simple Pwm Motor Drive Circuit Diagram. This circuit will drive a small dc motor over a wide range of speeds without stalling by controlling the duty cycle of the motor, rather than the supply voltage.Simple Pwm Motor Drive Circuit Diag [...]

An Electronic Watering Can Circuit Diagram. Summertime is holiday time but who will be looking after your delicate houseplants while you are away? Caring for plants is very often a hit or miss affair, sometimes you under-water and other times you over-water. This design seeks to remove the doubt from plant care and keep them optimally watered. The [...]

  With the introduction of Android L, the latest operating system Google Android Lollipop might be called the  Nexus 8 or Nexus 9 could have another design that we had seen.The Nexus Nexus 8 or 9 remains a mystery and although we saw earlier as might be the design of this new tablet, the latest concept shows us the tablet based on Android [...]

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 DiagramSourced By : http://circuitsdiagram-lab.blogspot.com/2013/11/simple-audio-milli-volt-meter-circuit.html [...]

The IFR EW a MOSFET transistor, such as transistor has higher feature high input impedance. In this circuit we used an IFR as transistor voltage regulator, which is not common, but it is very good to learn about their behavior in a circuit. Using IFR Voltage Regulator Circuit DiagramThis voltage regulator circuit uses a MOSFET isIRF4905 (Vdss [...]

This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of about 1 watt. At 1.5 watts it glows orange and above 3 watts it is bright red. The circuit is connected in parallel with the loudspeaker connections and is powered from the audio signal. The additional load that [...]

Fog Lamp Sensor Circuit diagram . For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions.Fog Lamp Sensor Circuit diagram : Fog Lamp Sensor Circuit DiagramWhen this fog lampis switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. [...]

The main function of the tuner is to select the RF signals from the desired frequency spectrum wave on VHF and UHF and more signs in the air Changing RF variable into a fixed IF frequency and to provide sufficient strengthening to cover the original data that has been transmitted.Block diagram of a series of TV tuner to receive the frequency VHF / [...]

Although electricity is a ubiquitous and there are times when it is not possible at all to connect your equipment to an electrical outlet. The purpose of the KIWI-Powered U-passes is to provide energy to any type of mobile device.You can connect this device to any source of energy, including the car’s cigarette lighter, USB port, an outlet or even [...]

If you are a fan of David Letterman, I'm sure you've seen and heard his nutty and often hilarious top 10 lists. He has become famous for them and they have been often imitated but never quite aptly duplicated by many around the world. I have no intentions of trying to claim or ever hope to be as funny as Letterman but I would love to create a top 5 [...]

Inverter 5000W with PWMThis inverter uses PWM (Pulse Width Modulator) with type IC SG3524. IC serves as a oscillator 50Hz, as a regulator of the desired output voltage. Input power ranging from 250W up to 5000W output and has. Following a series INVERTER 5000W with PWM (Pulse Width Modulator).Schematic Inverter 5000W with PWM (Pulse Width Modulator)Layout [...]

Low distortion Class-B circuitry 6V Battery Supply. Some lovers of High Fidelity headphone listening prefer the use of battery powered headphone amplifiers, not only for portable units but also for home "table" applications. This design is intended to fulfil their needs and its topology is derived from the Portable Headphone Amplifier featuring an [...]

This is yet another project born of necessity. It's a simple circuit, but does exactly what it's designed to do - dim LED lights or control the speed of 12V DC motors. The circuit uses PWM to regulate the effective or average current through the LED array, 12V incandescent lamp (such as a car headlight bulb) or DC motor. The only difference between [...]

One of the more difficult aspects when making a control or security system that uses a PC (a burglar alarm using a PC, for example), is the connection of the sensors to the computer. In addition to typically requiring specialist interface expansion boards, the writing of the program that includes interrupts is often also an insurmountable obstacle. [...]

This is a Project of Long-Delay Stop Switch Circuit Diagram. This Long-Delay Stop Switch Circuit Diagram presettable times for train stops in stations are indispensable if you want to operate your model railway more or less realistically according to a timetable. This circuit shows how a 555 timer can be used with a relatively small timing capacitor [...]

On the amplifier circuit using ic STK, the same as my previous posting. However, in the above circuit has 2 inputs and 2 outputs, or commonly called a stereo amplifier. This issue of power amplifier 2 x 18Watt and has impedance 8. To stress that it takes about 35-38Volt.Component list :ResistorR1 =  390KR2 = 390KR3 = 220KR4 = 220KR5 = 220KR6 = [...]

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Please note that this post is part one of four posts. I highly recommend reading all four posts in order before acting on any of the information.The other parts are located here:Part 2: http://diystrat.blogspot.com/2009/01/gibson-deluxe-tuners-part-two.htmlPart 3: http://diystrat.blogspot.com/2009/02/gibson-deluxe-tuners-fix.htmlPart 4: http://diystrat.blogspot.com/2010/01/gibson-deluxe-tuners-revisit.htmlI [...]

This circuit is purposely presented with many loose ends (not literally, of course) to stimulate experimenting with RF circuitry at a small outlay. Looking at the circuit diagram you may recognize a modified version of the SW Converter for AM Radios described elsewhere in this issue. The modifications were necessary to make the circuit compatible with [...]

This circuit is derived from the Portable Headphone Amplifier featuring an NPN/PNP compound pair emitter follower output stage. An improved output driving capability is gained by making this a push-pull Class-A arrangement. Output power can reach 427mW RMS into a 32 Ohm load at a fixed standing current of 100mA. The single voltage gain stage allows [...]

This design resulted from the need for a partial replacement of the well-known 8038 chip,  which is no longer in production and there fore hardly obtainable. An existing design for driving an LVDT sensor (Linear Variable Differential Transformer),  where the 8038 was used as a variable sine  wave oscillator, had to be modernised. It [...]

Like real movies, this circuit makes use of a characteristic of the human eye and brain known as the persistence of vision. A sequence of still pictures is projected onto a screen in rapid succession. The pictures differ slightly from one another and the brain interprets the succession of still pictures as continuous motion.Here the pictures are shadows [...]

Because of high input impedance required to maximize CMRR, High impedance balance output circuit shown in figure below , has been used for the input impedance is determined solely by the input bias resistance R1 and R2. High impedance balance output circuit also useful for interfacing with valve equipment in the strange world of retro-hi-fi.High impedance [...]

Power-up/down Sequencer Circuit Diagram. Whether you’re talking about a home cinema  or a computer system, it’s very often the case  that the various elements of the system have  to be turned on or off in a quite specific order,  or at least, automatically. Constructing this  sort of automation system is well within the  [...]

We recently bought a train set made by a renowned company and just couldn’t resist looking inside the locomotive. Although it did have an electronic decoder, the DCM motor was already available 35 (!) years ago. It is most likely that this motor is used due to financial constraints, because Märklin (as you probably guessed) also has a modern 5-pole [...]

Power unit: The power board supplies a DC voltage of 33V, 24V, 12V to the main board.out of this 33v is used by the tuner and 24v is used directly by the inverter and the sound amplifier IC. 24v also is converted into 5v by a regulator.  The 5v is changed into 3.3v and 1.8v by a regulator, both voltages(3.3v, 1.8v ) is used by VCTI, Scaler, FLI2300 [...]

This circuit consumes more power, but it's advantage is when you need a variable flash rate, like for strobe circuits. You can actually use this circuit as a remote control for strobes that have a remote input. Of course, it has many other applications besides strobes.R1, R2, C1 and the supply voltage determine the flash rate. Using a regulated power [...]

500W 12V to 220V Inverter Circuit Diagram  This is a 500W DC-to-AC inverter circuit diagram which produces an AC output at line frequency and voltage. 12VDC to 220V 50Hz inverter circuit will power 220V or 110V appliances from 12V car battery. The circuit is easy to make and is low cost. Use proper transformer. The output (in watts) is up to [...]

Here is a simple circuit for music-on-hold with automatic shut off facility. During telephone conversation if you are reminded of some urgent work, momentarily push switch S1 until red LED1 glows, keep the telephone handset on the cradle, and attend to the work on hand. A soft music is generated and passed into the telephone lines while the other-end [...]