Sound Operated Flip Flop Circuit

This is a design circuit in which the status of the output pins of a Flip Flop IC can be toggled by using sound. This circuit is based on LM324 IC. This is the figure of the circuit.


Processing operation of the circuit is a condenser microphone is used for picking up the sound. The first two op amp is in the IC1 LM324 is used to amplify the sound picked by the condenser microphone. The third op amp inside LM324 is wired as a level detector. When ever the voltage produced due to sound have a level more than that of the reference voltage at pin 5 of the third op amp, its output (pin 7) goes high, triggering the flip flop IC1 CD 4027.

As a result the state of the output pins of CD 4027 (pin 1 & pin 2) toggles for each burst of sound. The circuit can be powered from 4, 5 V DC. The mic M1 is a condenser mic. All capacitors must be rated 10V. The sensitivity of the circuit can be adjusted by varying the preset R9.

{ Read More }

Dew Sensitive Switch Circuit Using LM358

This is a simple design circuit that can be used to switch ON or OFF a device when the dew present in the surrounding atmosphere crosses a set value. This circuit uses a dew sensitive resistive element and a comparator based on LM 358 to perform the above said operation. This is the figure of the circuit.


In operation of the circuit, at normal condition the resistance of dew sensor element will be low and so the voltage drop across it. So the voltage at the non inverting pin of LM358 (IC1) will be less than the voltage at the inverting input of the LM358.So the output of the op amp will be low. This keeps the opto coupler (MCT2E) deactivated. When the dew increases the resistance of the element increases and so do the voltage across it. Now the voltage at the non inverting pin of LM358 (IC1) will be higher than the voltage at the inverting input of the LM358.So the output of the op amp will be switched to high. This in turn activates the opto coupler. The LED glows to indicate it. As a result we get an opto coupler activated and de activated according to the amount of dew in the atmosphere. The output pins of opto coupler pin (5&4) can be used to control the external device.

Diode D1, resistors R6&R3 and capacitor C1 is employed here to derive the power for the circuit directly from mains. The dew sensor is hard to find in market. But it can be easily obtained from a old VCR. Also the type no of the sensor is not so important here. Try with any thing you get. I used one from a old Hitachi VCR. LM 358 is a dual op amp. Here only one op amp inside it is used.

{ Read More }

Compass Derose Guide Ethernet Computer Network Wiring

Rm4200d Ethernet Wiring Example3.



Terminating Wall Plates Structured Home Wiring.



How To Guide Creating Cat 5 Utp Ethernet Crossover Cable How To.



The Compass Derose Guide To Ethernet Computer Network Wiring.



Cat 5 Ethernet Cable Standards Pin Out Assignments.



Ethernet Cables By Karl Shoemaker Ak2o.



Cat 5e Wiring Diagram.



Standard Cat 5 Wiring Schemes Learning Scholarly Technologies.



The Ethernet Rj45 Would Plug In To The Airport And.



Rj61 Wiring Color Code And Pinout Diagram Circuit Schematic.

{ Read More }

2012 Hyundai Genesis Owners Manual

here 2012 Hyundai Genesis Owners Manual
maybe you will need this owner manual so we provides post about this vehicle. beware before you download please to make sure you know this pdf is not on our hosted.
readour privacy first before you download this  2012 Hyundai Genesis Owners Manual

{ Read More }

Video Amplifier

The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this can be obviated by the addition of two resistors. If in the diagram R3 and R4 were direct connections, as in the original design, and P1 were fully clockwise and P2 fully anticlockwise, such a large base current would flow through T1 that this transistor would give up the ghost.

Moreover, with the wiper of P2 at earth level, the base current of T2 would be dangerously high. Resistors R3 and R4 are sufficient protection against such mishaps, since they limit the base currents to a level of not more than 5mA. Shunt capacitor C4 prevents R4 having an adverse effect on the amplification.

{ Read More }

Technical Diagram

Blue Wire Is Common This Is Optional Since Most Thermostats Have.



Thermostat Diagram Jpg.



Technical Diagram.



Water Heater Typical Electric Water Heater Construction Wiring Diagram.



Wiring And Connectors Locations Of Honda Accord Air Conditioning.



Schematic Diagram For Electronic Thermostat Of Isuzu Trooper Air.



Diagram Complete With Its Related Parts And Components Assembly.



Thermostat Wiring For Conventional Gas Furnace Air Conditioner Split.



Sanyo Air Conditioners And Heat Pump Electrical Wiring Diagram.



About 1997 Chevrolet Venture Charging Circuit And Wiring Diagram.

{ Read More }

11 W Stereo or 22 W Mono Power Amp

Integrated AF power amps have seen great improvements in recent years offering improved power and easier use. The TDA1519C from Philips contains two power amplifiers providing 11 W per channel stereo or 22 W mono when the two channels are connected in a bridge configuration. The special in-line SIL9P package outline allows the chip to be conveniently bolted to a suitable heatsink. The TDA1519CSP is the SMD version, in this case the heat sink is mounted over, and in contact with, the top surface of the chip.

11W Stereo Amplifier Circuit Diagram

The operating voltage of this device is from +6V to +17.5V. The two channels of the amplifier are different in that one channel, between pins 1 and 4, is a non-inverting amplifier, while the other between pins 9 and 6 is an inverting amplifier. It is therefore necessary in stereo operation, to wire the speakers so that one of them has its polarity reversed. Each amplifier has an input impedance of 60kΩ and a voltage gain of 40dB, i.e. 100 times. When both amplifier are used in a bridge configuration, the inputs are in parallel so that the input impedance will be 30kΩ.

22W Stereo Amplifier Circuit Diagram

A combined mute/standby function is provided on pin 8. In its simplest form this can be connected to the positive rail via a switch. When the switch is open the amplifier will be in standby mode and current consumption is less than 100µA. When the switch is closed, the amplifier will be operational. A circuit is also shown that uses the mute input to prevent the annoying switch-on plop heard when power amps are first switched on This is caused by the rush of current to charge capacitors C1 and C2.

Mute/Standby Switch Circuit Diagram

The circuit shown generates a ramp voltage, which is applied to pin 8. At switch on, as the voltage rises from 3.3 V to 6.4 V, the amplifier will switch out of standby mode and into mute mode allowing C1 and C2 to charge. Only when the ramp voltage on pin 8 reaches 8.5V will the amplifier switch into active mode. Protection built into the TDA1519C would seem to make it almost foolproof. The two outputs can be shorted to either of the supply rails and to each other. A thermal shutdown will prevent overloading and the power supply input is protected against accidental reversal of the supply leads up to 6V.

Source: http://www.ecircuitslab.com/2011/07/11-w-stereo-or-22-w-mono-power-amp.html

{ Read More }

Speaker to microphone converter circuit

This circuit is a simple approach for converting a loud speaker into a microphone. When the sound waves fall on the diaphragm of a speaker, there will be fluctuations in the coil and there will be a small proportional induced voltage. Usually this induced voltage is very low in magnitude and useless. Here in the circuit the low voltage is amplified using transistors to produce a reasonable output. The transistor Q1 is wired in common base mode and produces the required voltage gain. The transistor Q2 is wired as an emitter follower to produce enough current gain. The voice quality of this circuit will not be as much as a conventional microphone but quite reasonable quality can be obtained. To set up the circuit, keep the preset R2 at around 10 Ohms and connect the battery. Now adjust R2 to obtain the optimum sound quality.







Notes.

* Assemble the circuit on a general purpose PCB. * Power the circuit from a 9 V PP3 battery. * A 3 inch speaker can be used as K1. * All capacitors must be rated at least 15V. * An 8 Ohm speaker or head phone can be connected at the output to hear the picked sound.

{ Read More }

A Jogging Timer Circuit

3V Battery powered, Beeps after a fixed minutes delay

This circuit was developed since a number of visitors of this website requested a timer capable of emitting a beep after one, two, three minutes and so on, for jogging purposes. As shown in the circuit diagram, SW1 is a 1 pole 9 ways Rotary Switch. Setting the switch in position 1, the Piezo sounder emits three short beeps every minute. In position 2 the same thing happens after a 2 minutes delay, and so on, reaching a maximum interval of 9 minutes in position 9.

Circuit diagram:

A Jogging Timer Circuit Diagram

Parts:

R1_____________47K 1/4W Resistor
R2_____________10M 1/4W Resistor
R3______________1M 1/4W Resistor
R4_____________12K 1/4W Resistor (see notes)
C1,C3__________10µF 25V Electrolytic Capacitors
C2____________100nF 63V Polyester Capacitor
D1___________1N4148 75V 150mA Diode
IC1____________4093 Quad 2 input Schmitt NAND Gate IC
IC2____________4060 14 stage ripple counter and oscillator IC
IC3____________4017 Decade counter with 10 decoded outputs IC
Q1____________BC337 45V 800mA NPN Transistor
SW1___________1 pole 9 ways Rotary Switch (see notes)
SW2___________SPST Slider Switch
BZ1___________Piezo sounder (incorporating 3KHz oscillator)
B1____________3V Battery (two 1.5V AA or AAA cells in series etc.)

Notes:

• Needing only one time set, rotary switch can be replaced by an hard-wired link.
• A DIP-Switch can be used in place of the rotary type. Please pay attention to use only one switch at a time, or the device could be damaged.
• Varying R4 from 10K to 15K you can obtain more or less than three short beeps after the preset time delay.
• To obtain a one-second beep only, after the preset time delay, disconnect pin 9 of IC1C from pin 9 of IC2 and connect it to pin 8 of IC1C.

Source : www.redcircuits.com/Page32.htm

{ Read More }