This is Vice Control Music Outlet circuit using SL517A, this electronic circuit project build a very easy. The circuit is shown in Figure, and it is composed of acoustic sensor, voice control IC, relay control circuit, song voice circuit and AC buck rectifier circuit.

Vice Control Music Outlet Circuit using SL517A:





Voice control IC uses SL517A which contains high-gain amplifier, bistable flip-flop and buffer output level, and it has two packages of dual in-line and black ointment. Its internal functional block diagram is shown as below.

2x300W or 600W Power audio Amplifier Circuit Diagram:




The circuit includes thermal shutdown circuitry that activates when the die temperature exceeds 150°c. CIRCUIT’s mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state. Maximum Output power @ 8ohms : 300watt. Absolute max power supply voltage :±38V to ±40V. Recommended power supply voltage :±30V to ±35V.

It is a very simple build a simple Audio-oscillator Circuit Diagram  Project. The circuit`s frequency of oscillation is/= 2.8/ [C1 x (R1 + R2)]. Using the values shown, the output frequency can be varied from 60 Hz to 20 kHz by rotating potentiometer R2. A portion of IC1`s output voltage is fed to its noninverting input at pin 3.

Audio Oscillator Circuit Diagram:



The voltage serves as a reference for capacitor Cl, which is connected to the noninverting input at pin 2 of the IC. That capacitor continually charges and discharges around the reference voltage, and the result is a squarewave output. Capacitor C2 decouples the output. 

Here is a very simple and easy to use audio amplifier using I.C BEL(Bharat electronics limited)1895 , a very common IC. This circuit can run on 3V to 6v , making it easy to use in pocket amplifier. Cost is under 25/-

Sooper Amplifier Using BEL1895 I.C:



 
Parts list:

BEL1895 I.C (DIP8),
C1 = 470uF/10V,
C2 = 1000uF/16V,
C3 = 220uF/10V,
C4 = 100uF/10V,
C5 = 4.7uF/10V,
C6 = 47pF,
C7,C8 = 1uF,
R1 = 47Ohm,
R2 = 470Ohm,
R3 = 100K,
R4 = 1Ohm,
R5 = 10K V/C,
speaker, etc…
Total cost is around 20-30 rupeess(INR) or 0.6USD.

Monolithic Voice Record-replay Intergarted Circuit QX-R42 can constitute a monolithic solid recorder and its sentence is input by users and played repeatedly.Please press button SA3 when you record and at the time,27 feet of the IC is in low PWL and voice signals enter storage unit via Microphnone,MIC.

Monolithic Voice Record-replay Intergarted Circuit Diagram:




Plesae loosen the button and it can play the voice after finishing recording.There are two palyback buttons.SA1 is low PWL triggering playback.SA2 caues tirggering playback by pulse falling.SA1 can be chosen and SA2 is not used when we choose playback button.When we choose to use other circuit'spulsetriggering but button and the pulse will be input IC's 24 feet and it constitute automatic playback mode.

LED is recording indicating light and it sparks during the recording process.R5 and R6 constitute automatic gain control net.R2 and C3 constitute analog signals which iuput and output coupling loop.Thus the 14th and 15th feet output playback signals and the speaker is drived to playback directly.

This 1000 watt power inverter circuit diagram based on MOSFET RF50N06.If you want more power then  add additional  MOSFET paralleled at RF50N06.This MOSFETS are  60 Volts and 50 Amps as rated.  It is necessary to connect  a  FUSE with the power line and always a LOAD have to connected while power is being  applied . The output power of this inverter is up-to 1k watt , it depends on output power transformer . You can use your custom transformer with experimenting for best result.

1000 watt power inverter Circuit Diagram



How to parallel MOSFETs-1000 watt power inverter

The DC/AC power inverter can be useful anywhere where you do not have mains outlet, for example a car, trailer or cottage. It can power mains appliances like radios, tape recorders, DVD players, televisions, electric shavers, fluorescent lamps or cell phone charger. The maximum load depends on the transformer, transistors, and the size of the heatsink.

The source of 50 Hz frequency is a well known 555 timer. The frequency is set by the resistance of Rx and capacitor Cx. As the switches two N-type MOSFETs are used. One is driven directly from the 555 IC, the other through an logic inverter with BC547. Transformer is a mains one with two secondary windings 12V and must be designed for the maximum load required. The heat sink of the two power transistors must have heatsink according to the load.


12V / 230V 50Hz Square Wave Inverter Circuit Diagram:


 They are mounted on isolation pads. You can also use separate heatsink for each transistor and no isolation pads, but then the heatsinks must not touch each other and must not be grounded. The 12V supply must be sufficiently hard, the supply voltage should be in the range of about 11 - 14V. Use the proper fuse in series with the power input! In products that are not dependent on the frequency of 50Hz, it is possible to use a higher frequency, about 100 - 300Hz. This reduces the standby power.



 The frequency can be adjusted by changing the values ​​of Rx and Cx. It is also easy to modify the system from 50Hz to 60Hz just by reducing the Rx value by 1/6 (from 120k to 100k). MOSFET can be IRFZ44 for loads up to 200W, IRFZ48 up to 350W or IRF3205 up to 600W. For output above 600 watts is possible to combine multiple transistors IRF3205 in parallel. Very good parameters has also IRF1405. This type of DC/AC power inverter has non-stabilized output voltage, square wave.

Warning:
When working with the power inverter be careful - the output voltage is lethal, although input is safe voltage. Output voltage is isolated from the ground, but if you touched both output terminal the voltage is similarly dangerous as the mains voltage. Everything you do at your own risk. Author does not take responsibility for any of your harm.

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:

• 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 Power Supply Electronic Circuit Project a very simple and high efficiency step-up dc dc converter circuit that require few external components can be designed using the LM2700 step-up DC/DC converter with a 3.6A, 80mohms internal switch and pin selectable operating frequency.

3-to-12-Volts Converter Circuit Diagram:




With the ability to produce 500mA at 8V from a single Lithium Ion battery, the LM2700 is an ideal part for biasing LCD displays. The LM2700 can be operated at switching frequencies of 600kHz and 1.25MHz allowing for easy filtering and low noise. An external compensation pin gives the user flexibility in setting frequency compensation, which makes possible the use of small, low ESR ceramic capacitors at the output.

This circuit can be used for handheld devices and some other portable applications .

This step-up DC DC converter will provide a 12 volts DC output voltage from an input voltage range between 2.5 to 4.2volts .

This is simple and Low-cost circuit diagram project of simple power mosfet inverter circuit. This inverter can deliver .high-voltage ac or de, with a rectifier and filter, up to several hundred volts.

Low- Cost Power Mosfet Inverter Circuit Diagram:



 
The secondary and primary of T1-a 12.6 to 440 V power transformer, respectively-are reversed; e.g., the primary becomes the secondary and the secondary becomes the primary. Transistors Q1 and Q2 can be any power FET.

Note:
Be sure to heat sink Q1 and Q2. Capacitors C1 and C2 are used as spike suppressors.

As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential amplifier stage which appropriately raises the 1vpp sine signal at its input to a level which becomes suitable for initiating the driver stage made up of Q3, Q4, Q5.

1KVA (1000 watts) Pure Sine Wave Inverter Circuit Diagram:





The mosfets are also formed in the push pull format, which effectively shuffles the entire 60 volts across the transformer windings 50 times per second such that the output of the transformer generates the intended 1000 watts AC at the mains level. For acquiring the intended pure sine wave output, a suitable sine input is required which is fulfilled with the help of a simple sine wave generator circuit. It is made up of a couple of opamps and a few other passive parts.

It must be operated with voltages between 5 and 12. This voltage should be suitably derived from one of the batteries which are being incorporated for driving the inverter circuit. The below given diagram shows a simple sine wave generator circuit which may be used for driving the above inverter circuit, however since the output from this generator is exponential by nature, might cause a lot of heating of the mosfets. A better option would be to incorporate a PWM based circuit which would supply the above circuit with appropriately optimized PWM pulses equivalent to a standard sine signal.

This power supply Electronic Circuit Project is an very simple 115 Vac Converter, designed using the NCL30100 compact switching regulator controller designed for high brightness LED driver applications where efficiency and small size are very important.

115 Vac Converter Circuit Diagram:

This is a micro-inverter DC voltage to AC from a 12v battery can generate a voltage of 110 or 220 volts AC and a frequency of 50Hz to 60Hz.

Micro Inverter circuit DC voltage AC 12v x110v Circuit Diagram:






The circuit is very simple and does not need a printed circuit board, It is composed of two transistors oscillators that generate the square wave pulse to the transformer in the case is 10 +10 and its output 220V or 110V. This circuit is 50Hz, but can be changed by changing the value of RC .

This circuit has the power transistor and that depends on the transformer.

This DC to AC inverter circuit work based on unstable multi vibrator does. In this circuit, IC CD4047 is chosen as a heart of unstable multivibrator, because this IC type gives a complementary output that has opposite phase to another ( pin 10 and 11 as seen in Figure 1), and has 50 % duty cycle that satisfy to generate a pulse for inverter.

DC to AC Inverter with IC CD4047 Circuit Diagram

A simple inverter transformer used by loadable and allow (to increase efficiency ) change the frequency 50/60 Hz .

This simple drive can serve as a source of voltage 230V/50Hz for appliances to power by the transformer used , which can be compact fluorescent lamp with ballast choke DZ series and classic scooters , razors, power televisions and other consumer electronics , backup gas boilers during a power failure . and current clip . Are used both in the home and at the cottage, ala especially campers , boat and everywhere where there is no grid 230 .

Simple Inverter 12/220 V  Circuit Diagram


 After flipping levels at outputs 10 and 11 are provided transistors undone and the transistors T1, T4. The presence of signals produced 230V glow . PR1 switch can change the frequency of the generator from 50Hz to 60 Hz . To power all these appliances is not necessary to use a crystal oscillator 50Hz . With the values ​​of components RC oscillator on pins 1 , 2 IO1 the accuracy and frequency stability about 2 %, which for all these applications is sufficient .

Increasing the frequency to 60Hz can be achieved by a significant reduction in the current drawn from the battery without a load connected - to a half . At this frequency also can be partially small increase speed of asynchronous motors . (Motorcycle without carbon.) The frequency 60Hz is possible to operate all of the above appliances and inverter achieves higher efficiency. Frequency of 60Hz is used in USA , Japan and many other countries.
Design - for PCB mount 2pcs first wire connection , the first located at POJ1 , one of IO2 . Pinholes transistors is necessary to ream bur A1mm to fuse strips A1.2mm , four holes for mounting transistors A3.2mm . These drill holes are accompanied by dural L cooler and side joints with traces holes to mount transistors. Traced These holes are also drilled A3.2mm .
The transistors are bent pins 90 °. Under the screw heads must stringing plastic insulating washers and over mica , which is suitable to coat on both sides with silicone grease to improve thermal conductivity , the transistors screwed to the heat sink and plate as shown. Strengths of the PCB Can going through here , despite the current 4A. The integrated circuit is in the slot. Fifth, the transformer terminals to board pieces Lanka . On pins 9-10 transformers use wire and at least 1 mm. Power drive parameters can be easily increased in exchange for a larger transformer , which has a transfer 230V/10-12V .

No problems were tested transformer with an output of 200W . Unwinding the secondary winding of 12V to 10V achieved performance of about 160W . Even better performance , higher efficiency and lower no-load current consumption can be achieved with toroidal transformers . At higher outputs must be left to the radiator bolted effective cooling fins , with 40W transformer contained in the kit is L cooler at full load temperature of about 40C ° . The drive gives the open circuit voltage of about 260V , which is not necessary to worry about. The connected load voltage is reduced to the optimum .

I have enabled grid voltage fluctuation tolerance + / -10 %, which is from 207V to 253V . The drive is suitable for security build in a plastic box . It should be noted that the transformer , fuse , doutnavce and the output terminal voltage is dangerous .

Transformer 40W included in the kit:
Open circuit voltage of 260V
current consumption of 400 mA
voltage across the lamp 25W 230V
consumption at 25W load 2.5 A
voltage across the lamp 40W 220V
consumption under load 40W 3,8 A

Other transformer with an output of 100W/230V/10V
Open circuit voltage of 270V
current consumption of 800 mA
voltage across the lamp 40W 225V
consumption under load 40W 3,6 A
voltage across the lamp 60W 210V

consumption under load 60W 4,8 A

Since very large currents were involved, a certain Mr. Van Ark figured out a solution for this.  He used a glass tube filled with a liquid containing a red pigment and a metal ball. When  a large current discharge occurred the metal  ball shot up due to the strong magnetic field,  which caused the pigment to mix with the liquid. This could be seen for a good 24 hours after the event. After a thunder storm it was  easy to see where a discharge current took  place: one only had to walk past the tubes  and have a good look at them.

Here is a Simple Circuit Project of  Duty-Cycle Detector Circuit.This circuit looks at the time an incoming pulse is high.

Duty Cycle Detector Circuit Diagram:



If the incoming pulse is shorter than the adjusted (VAR1) pulse, the output of U1B is high. Values are shown for a 1-to 2-/as pulse.

Here is a simple Electronic circuit project of pulse generator with variable duty cycle. Using only one IC and six passive components, this pulse generator has a frequency range of 400 to 4000 Hz and an adjustable duty cycle of 1 to 99%. A threshold detector (ICA) and an in-tegrator (ICB) generate a triangular waveform. A positive voltage at the output of ICA causes the output of ICB to become a negative-going ramp. When the output of this ramp reaches a certain value, ICA, by virtue of its positive-feedback net-work, changes state; its output becomes nega-tive, and the integrator generates positive ramp. Pulse

Generator with Variable Duty Cycle Circuit Diagram:



This process continually repeats. A voltage fol-lower (ICC) and a 100-kO potentiometer provide a variable ±18-V reference voltage. This reference voltage, along with the triangular waveform, feeds into the positive and negative inputs, respectively, of comparator ICD. You can set the comparator's trip voltage at any point on the triangular waveform; ICD's output changes at that point. Varying the reference voltage alters the duty cycle of the comparator's output by adjusting the potentiometer at the negative input of the integrator, thereby varying the integration time without altering the duty cycle.

A talking compass is made up using a Hall-effect direction sensor (MOD1) and an ISD1016 analog audio storage device.

Simple Electronic Talking Compass Circuit Diagram:



It is possible to program eight two-second announcements, for each of the eight main compass directions.The Talking Compass is comprised of a digital compass (MOD1), and ISD1016 analog storage de-vice (U2), a 74S188 preprogrammed PROM (U3), and a handful of additional components.