Diagram SOlution

The creator built a neat looking project which uses a piezoelectric element from a tweeter to detect vibrations. He is using a Zilog eZ8 series microcontroller which seemed to be very popular years ago.


This project dependently using a strong vibration while the enclosure has been placed on the top of vibration sensor. The LED matrix has two eyes the wandering around effects. Whenever there is no vibration being detected the eyes will shut down as if they were sleeping.


A button was placed behind to manually switch it into various modes. It uses a four AA batteries and can draw 150uA when asleep while it draws for about 150mA when up.

Everything. That’s a scary word, one I almost avoided including in the title. Can any book actually cover everything about a topic? Yes and no. Yes, in the sense that the principles and techniques you’ll learn can be applied to the repair of every kind of consumer electronics device presently being made or likely to be sold in the near future. No, in that it’s impossible to fit each of the thousands of types of components and countless varieties of gadgets in the world into one volume. Covering all of them in deepest detail would take a library, and a good-sized one at that.

File Type: PDF
File Size: 3.4MB
Total Pages: 337

Chapter 1

• Prepare for Blastoff: Fixing Is Fun!

Chapter 2

• Setting Up Shop: tools of the trade

Chapter 3

• Danger, Danger! Staying Safe

Chapter 4

• I Fix, therefore I am: the philosophy of troubleshooting

Chapter 5

• Naming Names: Important terms, Concepts and Building Blocks

Chapter 6

• Working Your Weapons: Using test equipment

Chapter 7

• What Little Gizmos are Made of: Components

Chapter 8

• Roadmaps and Street Signs: Diagrams

Chapter 9

• Entering Without Breaking: Getting Inside

Chapter 10

• What the heck Is that? recognizing Major Features

Chapter 11

• A-hunting We Will Go: Signal tracing and Diagnosis

Chapter 12

• Presto Change-O: Circuit Boards and replacing Components

Chapter 13

• That’s a Wrap: reverse-Order reassembly

Chapter 14

• Aces Up Your Sleeve: tips and tricks for Specific products

source:LINK

This circuit power Inverter 100W, it easy and good ideas. When use the electric appliances that want 220V AC 50HZ, which have small-sized about 100Watt not exceed. By when you apply outside home, as a result have to have Mini power inverter about 100Watt, perform modify from work electricity forces of battery 12V give tall fair the work. 

If you are New user electronics or want to economize or want to build electronics project use by oneself. I begs for to advise this circuit , because it uses , transistor number BC557 or the number replaces, perform oscillator generator. Then have power transistor 2N3055 numbers perform to drive coil transformer for converter voltage give tall go up 220V AC 50HZ at the electric power about 100 watt not exceed. When apply to transformer about 2A-3A.

This is a 5Volt to 12Volt DC-DC step-up (boost) converter circuitry with the intention of is especially ideal pro the USB powered applications. primarily of all a USB harbor has two current supply modes. beforehand detecting the connected device, it food highest 100mA to the load. once recognizing the device, it increases the output current up to 500mA. 

Taking part in this circuit, controller (LT1618) moreover provides two input current modes. 100mA and 500mA input modes can be there selected by the user. Output currents are narrow due to the increased the makings difference on the output. as soon as the demand of the load increases, output voltage pray start to decrease. representing paradigm, if the circuit operates within the 100 mA input mode, once the load is 35 mA, the output voltage will come to pass reserved on 12V. But if the load increases to 50 mA, output voltage strength of character reduce to 8V to preserve the constant 100 mA input current.

By using IC NE555, which causes wave clear the sector output allows the voltage nearly 6V after the signify on the output from a pulse plus C2 acts charge through D1 to ground and if the pulse harmful capacitor C2 desire discharge. through diode D1 and capacitor C3 to chage so as to negative voltage is about-6V, but being aloof to the run to of absent-5V zener diode ZD1 current output will happen approximately 12mA. To test the circuit or else circuits with the purpose of may well need various circuits, but we take refusal fire-5V power supply-5V, but if the battery 9V circuit can allow us to avail yourself of the volt-5V being desired. 

Without any  USB to phone battery charger circuit we can charging phone battery using port on USB computer , but it will quickly damage the phone battery, and the battery will bulge. Because the voltage which was issued on usb is 5 volts , while the average-voltage phone battery 3.5 - 3.7 volts. Thats why this USB to phone battery charger circuit is required , this USB to phone battery charger circuit reduce votlage to 3.7 volt usb, but will not reduce currents and  will make a durable phone battery.

Because of energy crisis Load shedding may be a common problem in several countries.. Sudden power fluctuations, surge and high voltage may spoil sophisticated household appliances like TV, VCR, VCP and music system. This circuit provides protection against these problems and automatically changes the power supply from Generator output to mains supply and also switches off the generator.

Circuit descriptions

This circuit is self explanatory. When lines supply voltage crosses the preset level, Zener diode ZD4 break down and thus transistor T2 conducts, T3 does not conduct, causing the relay to de-energise. Voltage surge at the time of power resumption is protected by the delay circuit around transistor T1.

All the portable petrol and kerosene generators have a connection from CDI. To stop the engine of the generator-set, this connection is to be grounded momentarily (through the switch). This lead is to be connected with the ground through the N/C point of the relay.

Auto Changeover from Generator to Mains Supply Circuit Diagram


Instead of the one transformer, two transformers are used in series to ensure better life of the unit. Value of capacitor C2 can be increased or decreased for the variation of delay time. A negative feedback resistance, R6 (15 K-ohm to 100 k-ohm) can be incorporated between transistor T3 and T4 to overcome the damage that could be caused by voltage fluctuations.


Parts List:

Resistors (all ¼-watt, ± 5% Carbon)

R1 = 10 Ω

R2 = 1 KΩ

R3 = 820 Ω

R4 = 57 KΩ
R5 = 47 Ω

R6 = (15 KΩ to 100 KΩ)

Capacitors

C1 = 100 µF/25V

C2 = 1000 µF/12V

C3 = 100 µF/18V

Semiconductors

T1 = BC147

T2, T3 = SL100

D1, D2 = 1N4001

D3 = 1N4007

ZD1 = 5.6V/400mW

ZD2 = 7.8V/400mW

Miscellaneous

X1, X2 = 230V AC primary to 12 V, 500mA secondary transformers

RL1 = 12V/450 Ω relay

Part ListIC1 7404 = 1
IC2 7490A = 1
R 1 K = 2
R 3.3 K = 1
C Trim Polymer 39 pF = 1
C Electrophoresis 4.7 uF 16V = 1
C Milar 47 nF 16 V = 1
C Milar 10 nF 16 V = 1
C Ceramic 68 pF 50 V = 1 

This  is a very simple power supply and most popular to use. Because this circuit is simple and easy to make. Component required is Transformer ( CT transformer ) with output secondary 12 Volt, 4 diode , 2 Condensator Electrolit , Only this component you can make this power supply.