Showing posts with label simple. Show all posts
Showing posts with label simple. Show all posts

Monday, January 26, 2015

Simple Sleeping Aid

Sleeping Aid Circuit diagram :


Many individuals knowledgeable slumbering properly inside normal area, in to a covering or even a solid wood hut. This kind of simple truth is credited not merely for the healthful ambiance but in addition coming from our own subconscious power to understand normal Earths magnetic-fields. The particular routine produces this sort of Geo-magnetic-fields and also lets us understand these: this way our own human brain will be ornamented simply by a great surroundings to get a appear slumber. (In. T. Simple tips because of this routine are usually via In german paperwork).

IC2C and also IC2D create a couple of rectangular ocean with concerning 1. a couple of and also 5 Hz respectively. These kinds of wave-forms are usually became 60µS pulses on the identical frequencies through C5 & C6 and also blended with Q1 Foundation. This kind of transistor pushes the particular Radiator coil nailers using a scalar group of pulses regarding 60µS size and also 9V amplitude. IC1, IC2A & IC2B kind the particular timer part.

C1 & R2 offer auto-reset regarding IC1 with switch-on. The inner oscillator regarding IC1 pushes the particular 18 period ripple countertop and also, right after concerning a quarter-hour, end result flag 1 should go large. Flag 3 regarding IC2A should go lower and also prevents IC2C & IC2D oscillation. When SW2 will be still left available (Different function functioning), right after a quarter-hour flag 1 regarding IC1 should go lower, flag 3 regarding IC2A should go large and also oscillators are usually empowered once more.

When SW2 will be sealed (Quit function functioning), initially end result flag 1 regarding IC1 should go large, the inner oscillator with the IC will be impaired through D1. Which means routine stays away from right up until any reset to zero heart beat will be placed on flag 12 through P1 or perhaps if the complete system will be switched-off and restarted. A similar thing takes place any time SW1 will be switched on 25 or perhaps 58 moments opportunities, clearly transforming moment size.

IC2B drives pilot LED D2 which operates in the following three modes:
  • flashes quickly and almost randomly when the Radiator coil is driven
  • flashes somewhat slowly and regularly when the Radiator coil is pausing during the Alternate mode operation
  • is off when the circuit auto-stops (Stop mode operation)
Parts:

R1 = 1K 1/4W Resistors
R2 = 10K 1/4W Resistor
R3 = 10M 1/4W Resistors
R4 = 2M2 1/4W Resistors
R5 = 1K 1/4W Resistors
R6 = 10M 1/4W Resistors
R7 = 2M2 1/4W Resistors
R8 = 4K7 1/4W Resistors
R9 = 4K7 1/4W Resistors
C1 = 47µF 25V Electrolytic Capacitors
C2 = 100nF 63V Polyester Capacitor
C3 = 330nF 63V Polyester Capacitors
C4 = 330nF 63V Polyester Capacitors
C5 = 15nF 63V Polyester Capacitors
C6 = 15nF 63V Polyester Capacitors
C7 = 47µF 25V Electrolytic Capacitors
D1 = 1N4148 75V 150mA Diodes
D2 = LED (any type) (see Notes)
D3 = 1N4148 75V 150mA Diodes
D4 = 1N4148 75V 150mA Diodes
D5 = 1N4148 75V 150mA Diodes
IC1 = 4060 14 stage ripple counter and oscillator IC
IC2 = 4093 Quad 2 input Schmitt NAND Gate IC
Q1 = BC327 45V 800mA PNP Transistor
L1 = Radiator coil (see Notes)
P1 = SPST Pushbutton
SW1 = 2 poles 4 ways rotary switch
SW2 = SPST Slider Switch
B1 = 9V PP3 Battery, Clip for PP3 Battery

Features:
  • Generates a natural electromagnetic-field
  • Makes easier to fall asleep
  • Induces a prolonged and sound sleep without drugs
  • No side effects
Use of this circuit:
  • Select a timing option by means of the rotary switch SW1.
  • Choose 15, 30 or 60 minutes operation.
  • Select "Stop" or "Alternate" mode operation by means of SW2.
  • With SW2 closed (Stop mode operation) the electromagnetic radiation stops after the pre-set time is elapsed.
  • With SW2 opened (Alternate mode operation) the device operates for the pre-set time, then pauses for the same amount of time: this cycle repeats indefinitely.
  • Place the unit under the pillow and sleep like a log.
  • To reset a cycle press P1 pushbutton.
Notes:
  • L1 is obtained by winding randomly 600 turns of 0.2 mm. enameled wire on a 6 mm. diameter, 40 mm. long, steel bolt. Secure the winding with insulating tape.
  • Mean current drawing is about 7mA, decreasing to less than 4mA during pauses when in Alternate mode operation.
  • Battery life can be dramatically increased omitting LED D2 and its associated resistor R5.
  • Use a plastic box to enclose the circuit: metal cases can severely limit electromagnetic radiation.
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Monday, November 17, 2014

Simple 100W inverter circuit

Here is the circuit diagram of a simple 100 watt inverter using IC CD4047 and MOSFET IRF540. The circuit is simple low cost and can be even assembled on a veroboard.

CD 4047 is a low power CMOS astable/monostable multivibrator IC. Here it is wired as an astable multivibrator producing two pulse  trains of 0.01s which are 180 degree out of phase at the pins 10 and 11 of the IC. Pin 10 is connected to the gate of Q1 and pin 11 is connected to the gate of Q2. Resistors R3 and R4 prevents the loading of the IC by the respective MOSFETs. When pin 10 is high Q1 conducts and  current flows through the upper half of the transformer primary which accounts for the positive half of the output AC voltage. When pin 11 is high Q2 conducts and  current flows through the lower half of the transformer primary in opposite direction and it accounts for the negative half of the output AC voltage.

Circuit diagram.
Notes.
B1 can be  a 12V/ 6Ah lead acid battery.
Q1 and Q2 must be fitted to a proper heat sink.
T1 can be a 9-0-9 V primary, 230V secondary, 150VA transformer .
Do not expect much from this circuit. The is very simple one suitable for low grade applications.

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Wednesday, November 12, 2014

Simple 12V DC to 220V 100W Inverter


This is 100W inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor. Power output is 100W from 2-3A transformer. 
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Friday, November 7, 2014

Simple Stereo VU Meter

I like to see lights move to music. This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker output of your audio amplifier. You want to build two identical units to indicate both right and left channels. The input signal level is adjusted by the 10k ohm VR. If you wish to make a very large scale model of this unit and hang it on your wall there is an optional output transistor that can drive many LEDS at once. The unit I built drove three LEDS for each output. The sequence of the LEDS lighting are as follows Pin 1, 18, 17, 16, 15, 14, 13, 12, 11, 10.
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Wednesday, November 5, 2014

Simple Dag gerboard Position Detector

It is easy to build Dag-gerboard Position Detector Cirucit.  In sailing regattas it’s handy to have a dag-gerboard that can be raised and lowered vertically. As the winding handle or positioning motor needs to rotate the spindle of the lifting device some 100 to 150 times throughout its full range it would be extremely handy to have a quick idea of its current position. An electronic count of the number of revolutions would be ideal. Thank goodness most sailors now have a 12-V supply available!

To get this to work you need to apply white and black markings to the spindle, each covering half of the circumference. Next, mask off two electric eye devices (reflected light sensors) next to one another (approximately 10 mm apart). For secure detection both sensors should be positioned not more than 5 mm from the paint markings.

Dag-gerboard Position Detector Circuit Diagram :

Detector


The markings to be read by the sensor should be displaced laterally, so that the direction of rotation can be recognised in addition to the number of revolutions counted. At the heart of our circuit is a PIC16F628 from Microchip, which as usual can be bought ready programmed from Elektor or you can do this bit yourself by downloading free firmware (for details of both see [1]).

At pins 1 of the two reflected light sensors IC3 and IC4 we need to ‘see’ more than 2.0 V from the white segment and less than 0.8 V from the black mark (with an operating volt-age between 4.5 and 5.5 V). The two signals detected are taken to plug connector along with the operating voltage and ground. It’s convenient if you also provide a connector from the microcontroller as well, so that the sensor and the controller board can be linked by a test lead.

The multiplexing of the three seven-segment displays is programmed at a rate of 100 Hz.
Acceptable values for the revolution count are between 0 and 140. If the count exceeds or falls below these limits, then the counter is not incremented. The RESET key S2 sets the counter back to zero. Jumper K2 enables you to reverse the direction of counting. The count is retained if the operating voltage is removed and is loaded again when next pow-ered up.

The source code can also be downloaded from the website mentioned above, making it possible (for instance) to define alternative counter limit values (the maximum value is defined in the line #define max 140). For compiling the code you can use the CC5X compiler, of which there is a free version (www.bknd.com/cc5x).

Author : Hermann Sprenger - Copyright : Elektor


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Monday, October 27, 2014

Very Simple Pre Regulator


Present desire be there many period anywhere it is considered necessary to waste the P05 supply module from a upper voltage source. intended for case, if you lack to add balanced inputs to a power amplifier, next you need a +/-15V supply, but the amps supply voltage willpower survive much too far above the ground for the manager ICs.
This project is roughly speaking to the same extent unpretentious as they take place, and is very economical to build. It is designed in support of exactly this reason - to reduce the amplifier supply voltage to a safe significance for controller ICs.

The circuit it is very down-to-earth indeed. You desire need to make it to a hardly any simple calculations to determine the resistor value, but this is explained beneath.


The circuit made known uses the 24V zener diodes (D1 and D2) to adjust the output voltage to a unimportant under 24V. This is a seamlessly safe input voltage in favor of standard 3-terminal regulators, and using this circuit long for provide even better guideline and supply clamor rejection at that time typical. Using MJE3055 and 2955 transistors will allow for supply voltages up to 70V quite safely, but they will need to take place mounted on a heatsink (with insulating washers).

The single-mindedness of R5 is to detach the foremost power amplifier ground from the supply, to prevent hum loops. The 10Ω resistor revealed motivation be fine in lieu of the vast majority of applications, but might need to remain untouched. This is up to you to research with if essential. I hint at so as to R5 ought to be 1W. R2 and R4 may perhaps be 1/4W before 1/2W resistors, and 1W zeners are recommended.

The lone calculation is to determine the regard in support of R1 and R3. original, quantify the power amp supply voltage (V1). The resistor value is calculated to provide a top figure zener current of 20mA, and this hope against hope ensure sufficient found current for the pass transistors representing up to 100mA before so output current by the side of ±15V.

V2 = V1 - 24 (someplace V1 is amplifier supply voltage, and a 24V zener is used)
R1 = R3 = V2 / 20 (R1 and R3 morals are arrived kΩ)
P = V2² / R1 (P is power dissipation of R1 and R3 in mW)

consent tos begin to have a supply voltage of ±56V meant for an pattern calculation ...

V2 = 56 - 24 = 32V
R1 = R3 = 32 / 20 = 1.6k (practice 1.5k)
P = 32² / 1.5 = 680mW = 0.68W (use 1W)

The dissipation in Q1 and Q2 could as well be located calculated, but you need to know the current drawn by the outdoor circuits. on behalf of instance, if the external circuitry draws 50mA, the transistor power dissipation is ...

Pt = V2 * Iext = 32 * 50 = 1600mW = 1.6W (it self-control need a slight heatsink)

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Thursday, October 23, 2014

Very Simple Peak Indicator Circuit

 This series is made to indicate that the amplifier has been given the maximum signal, the amplifier has the ability to be at its peak. if the lights do not mean the signal-plus volume. the way it works is the LED lights will light up when given a signal that more than 1.8 volts, the average amplifier will be saturated (maximum) if the signal was given more than this. 

The circuit is very simple to the point that we forget that making a series of peak signal can in this way. circuit is mounted on the output tone control IC, master mixer output, or input power amplifier. This series does not impose on other circuits. survived the experiment!
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Friday, October 17, 2014

Simple Mat Switch Circuit

This simple circuit produces a warning beep when somebody crosses a protected area in your home or office. The switch, hidden be-low the floor mat, triggers the alarm when the person walks over it.

The circuit uses a conductive foam as the switch. It can be two small pieces of conductive pads usually used to pack sensitive ICs as antistatic cover. Alternatively, you can make the switch by coating conducting carbon ink on two small pieces of a copper-clad board.

Simple Mat Switch Circuit diagram :

Link


Simple Mat Switch Circuit Diagram

When the circuit is in standby mode, transistor T1 does not conduct, since its base is floating. When the person walks, the switch is pressed and current flows through R1 and the switch to provide positive bias to transistor T1. Transistor T1 conducts and its collector voltage drops, which acts as a negative trigger input for the monostable wired around IC NE555 (IC1).

IC1 outputs a pulse of fifty-seconds duration with preset values of R4 and C3. This pulse is applied to the buzzer through transistor T2. The buzzer sounds a warning beep on unauthorised entry. The pulse duration can be changed to the desired value by changing the values of R4 and C3. Resistor R2 in the circuit makes the trigger pin of IC1 high to prevent false triggering.

Assemble the circuit on a general-purpose PCB and enclose in a plastic case. Use a 9V battery to power the circuit. Connect the touchpad switch with the PCB and hide under the mat at the entrance. The PCB can be mounted on the nearby wall.

Make the switch carefully using conducting foam or copper clad coated with conducting ink. Place the two pieces with their conducting surface facing each other. Solder carefully a thin copper electric wire and ensure that it makes contact when the two plates touch together on pressing. Provide two 1cm rubber tabs between the plates to avoid touch in the standby mode.
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Thursday, October 16, 2014

Simple Sound Activated Lamp Relay Switch

This simple Sound-Activated Lamp circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car’s LED light show.  The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0.7 volts, act as sensitivity adjuster. A certain level, the signal coming from microphone, after amplification by Q1, will trigger the SCR and light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps. If we use a relay, place a 1N4007 diode in parallel with the relay coil to prevent the back-emf from  relay coil destroying the SCR.

 Sound-Activated Lamp Circuit Diagram

sound-activated lamp circuit diagram

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Thursday, October 2, 2014

How to Make a Simple FM Radio Circuit

This straightforward fm radio receiver circuit involves a regenerative rf stage, TR1, accompanied by a 2 of three-stage sound amplifier, TR2 to TR4.
In certain spots 3 steps of music boosting most likely are not needed, wherein situation TR3 and its related parts could be excluded as well as the free end of capacitor C5 linked to the collector of TR2.

The crucial portion of the fm radio receiver is the initial stage, TR1/VC1, in which the wirings needs to be kept as tight as they can. Coil L1 is established by winding 8 turns of 1mm (20 swg) enamelled copper wire on a six mm diameter former, that may be in that case eliminated. Following that L1 must be extended cautiously and uniformly to a length of about 13mm.

Transistors List
TR1 = BF199
TR2 = TR3 = TR4 = BC547

The tunning capacitor VC1 is among the 2 fm areas of a tiny fm transistor radio with integrated trimmers (VC2). The “earthy” tail (moving vanes and spindle) is hooked up to the 22pF capacitor C1. The value of the rf choke L2 is not important, whatever from 1µH to 10µH genuinely acceptable.

The output is appropriate for regular headphones linked in series to offer an impedance of 64Ω.

Tuning-in the fm radio receiver

To the radio receiver, potentiometer VR1 should initially be promoted gradually (in the direction of the end of the path linked to battery positive) until, at around the half-way position, an abrupt little rise in background disturbances is going to be heard, suggesting the beginning of oscillation. It after that must be assisted off, extremely steadily, until oscillation simply ceases; it next has to be easy to tweak in a few stations.

The right frequency range of 87 MHz to 108 MHz can be acquired by fine-tuning VC2 at the higher frequency (108 MHz) and somewhat flexing or squeezing jointly the turns of coil L1 towards the end (87 MHz).

About Frequency Modulation

FM transmitting is a transmission know-how pioneered by Edwin Howard Armstrong which employs frequency modulation (FM) to high-fidelity audio over broadcast radio. The "FM band" is the "frequency spectrum wherein FM is utilized for broadcasting". This phrase is moderately inaccurate, because it relates a modulation approach with a variety of frequencies.
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Sunday, September 21, 2014

Amplifier simple easy and cheap with IC TA7368P

Indeed , this amplifier is suitable known as the title above. Viewed from the schematic alreaady seen that this amplifier circuit requires little components and parts were cheap. This amplifier requires 1 piece of IC TA7368P is manufactered by TOSHIBA is the price too low, then in addition to IC amplifier requires 3 components elco capacitor whose value is not too big. Maybe if you make this amplifier circuit, the total price of all must not be more than $ 1. This amplifier only has more than 1W output, perhaps because it has little strengthening it so that the output is released is very small. But to make this is quite easy and not too costly.
cheap
Part List :

Capacitor
C1 = 100 uF
C2 = 100uF
C3 = 470uF

IC
IC1 = TA7368P





Good Luck :)
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Friday, September 12, 2014

Simple 3 Input and Gate Comparator Wiring diagram Schematic

This is a Simple 3 Input and Gate Comparator Circuit Diagram. This schema has high output only when all three inputs are high. The non inverting-input current, when all three inputs are high, must exceed that of the inverting input, as determined by R4. The schema can be converted to a AND gate by transposing the two inputs of the op amp.

3 Input and Gate Comparator Circuit Diagram

3

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Thursday, September 11, 2014

Simple Cable Bootstrapping Wiring diagram Schematic

This is a Simple Cable Bootstrapping Circuit Diagram. Bootstrapping or booting refers to a group of metaphors which refer to a self-sustaining process that proceeds without external help. In computer science, bootstrapping is the process of writing a compiler.In this schema Bootstrapping input shield for a follower reduces cable capacitance, leakage, and spurious voltages from cable flexing Instability can be avoided with small capacitor on input. 


Simple Cable Bootstrapping Circuit Diagram


Simple

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Simple LED Torch

A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance, consumes around 2 Watts. The LED Torch in Fig. 1 consumes just 24 mW, giving it more than 80 times longer service from 4 AA alkaline batteries (that is, up to one months continuous service). Although the torchs light output is modest, it is nonetheless quite sufficient to illuminate a pathway for walking.

Circuit Diagram :

Fig. 1 : Simple LED Torch Circuit Diagram


The LED Torch is based on a 7555 timer running in astable mode (do not use an ordinary 555). A white LED (Maplin order code NR73) produces 400 mcd light output, which, when focussed, can illuminate objects at 30 metres. Try Conrad Electronic for what appears to be a stronger white LED (order code 15 37 45-11). A convex lens with short focal length is placed in front of the LED to focus the beam. If banding occurs at the beams perimeter, use another very short focal length lens directly in front of the LED to smooth the beam.

If a different supply voltage is preferred, the value of resistor R3 is modified as follows:

9V - 470 Ohm
12V - 560 Ohm

See my "Wind-up Torch" feature article in the October 2000 edition of Everyday Practical Electronics for a completely battery-free go-everywhere torch.

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Wednesday, September 10, 2014

Simple Electronic Lock

Simple Electronic Lock Circuit diagram. There are six (or more) push switches. To unlock you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the schema unlocking. When the schema unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another schema. Please Note: This schema just turns on an LED for about one second when the correct switches are pressed. It does not actually lock or unlock anything!

Simple Electronic Lock Circuit diagram :
 Simple
Simple Electronic Lock Circuit Diagram

Stripboard Layout :

Stripboard
Parts :
  • resistors: 470, 100k ×2, 1M
  • capacitors: 0.1μF, 1μF 16V radial
  • on/off switch
  • push-switch ×6 (or more)
  • stripboard 12 rows × 25 holes
  • red LED
  • 555 timer IC
  • 8-pin DIL socket for IC
  • battery clip for 9V PP3
  •  
A kit for this project is available from RSH Electronics: www.kpsec.freeuk.com

Copyright :John Hewes 2006,  The Electronics Club
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Simple Isolated Converter Wiring diagram Schematic

This the Simple Isolated Converter Circuit Diagram. In this Simple Isolated Converter Circuit Diagram a negative output voltage de-de converter generates a -5 V output at pin A. In order to generate -5 Vat point A, the primary of the transformer must fly back to a diode drop more negative than -5 V. If the transformer has a tightly coupled 1/1 turns ratio, there will be a 5 V plus a diode drop across the secondary. 

The 1N5817 rectifies this secondary voltage to generate an isolated 5-V output. The isolated output is not fully regulated since only the -5 V at point A is sensed by the MAX635.

Simple Isolated Converter Circuit Diagram


Simple

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Tuesday, September 9, 2014

Simple Car Battery Voltage Monitor Circuit

SimpleThis schema is used to monitor the battery voltage to display a dual-colored LED status of the battery to. If the LED “green”battery voltage exceeds 11.9 volts. If the yellow LED, battery voltage 11.9 to 11.5 volts. If the LED is “red” If the battery voltage below 11.5 volts. You can of course change the trigger points by the trimmer resistors and / or changing the value of the resistors in the divider.

A dual op amp is used as a comparator. The green LED on the board, until the voltage exceeds 11.5 volts. The red LED illuminates when the voltage falls below 11.9 volts to the schema. Therefore, in the 11.9 to 11.5 volts, both LEDs are on, producing a slightly yellow color. When the voltage falls below 11.5 V, the green LED, and now only the red LED flashes to indicate low voltage.

Parts List
R1=1K2
R2-3-4=680R
R5=15K
R6=10K
R7-8-9-10=1K
IC1=LM324
D1=5V6 /0.5W Zener
D2-3-4-5=LED
RV1=10K trimmer

 Is recommended that multi-shaper for V1 and V2. Muti-trimmer makes it much easier to trigger points to make as a less expensive single-turn trimmer. The trimmer can be completely eliminated if you have access to a range of 1% resistors and has had calculated carefully. You would also want to provide more accurate reference voltage as the common 78L05 regulator.
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Saturday, September 6, 2014

Simple Buffered Analog Switch Wiring diagram Schematic

This is the Diode–transistor logic and Transistor–transistor logic Simple Buffered Analog Switch Circuit Diagram. This analog switch uses the 2N4860 JFET for its 25 ohm ron and low leakage. The LM102 serves as a voltage buffer. This schema can be adapted to a dual trace oscilloscope chopper. The DS7800 monolithic IC provides adequate switch drive controlled by DTL/TTL logic levels.

Buffered Analog Switch Circuit Diagram


Buffered

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Wednesday, September 3, 2014

Simple Schmitt trigger III Wiring diagram Schematic

We build 1st Simple Schmitt trigger Circuit Diagram and Simple Schmitt trigger II Circuit Diagram. Now we made to day Simple Schmitt trigger III Circuit Diagram. In this simple schema the lower trigger point is fixed at % Vcc, but the upper trigger point is adjustable by means of Pin 5 from Vi Vcc to slightly less than Vcc. The Schmitt trigger will operate with input frequencies up to 50 kHz.

Simple Schmitt trigger III Circuit Diagram



Simple


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Monday, September 1, 2014

Simple Schmitt Trigger Wiring diagram Schematic

This is a Simple Schmitt Trigger Circuit Diagram. Schmitt trigger is a comparator schema with hysteresis, implemented by applying positive feedback to the non-inverting input of a comparator. In this schema By replacing the common-emitter resistor in a conventional Schmitt by a zener diode the hysteresis normally associated with these diagram is eliminated. 

Simple Schmitt Trigger Circuit Diagram


Simple

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