Tehnik Service » Projects

PCB for USB Charger with MAX1811

TehnikService — Thu, 14 Apr 2011 10:40:31 +0000

Today i created pcb for Lithium Ion / Lithium Polymer USB Battery Charger with MAX1811, and designed with eagle pcb software.

About Max1811

The MAX1811 is a single-cell lithium-ion (Li+) battery charger that can be powered directly from a USB port or from an external supply up to 6.5V. It has a 0.5% overall battery regulation voltage accuracy to allow maximum utilization of the battery capacity.

The charger uses an internal FET to deliver up to 500mA charging current to the battery. The device can be configured for either a 4.1V or 4.2V battery. The MAX1811 is available in a small 1.4W thermally enhanced 8-pin SO package.

Download: Eagle Files

Download PCB in: PDF

SPI Flash Programmer

TehnikService — Wed, 30 Mar 2011 12:49:14 +0000

Today we made a new project SPI Flash Programmer. I needed this programmer to read the contents of 25L1005 on a LCD Monitor. The circuit is connected to the PC via parallel port and he have external power supply. This circuit contains a few components listed below.

IC1 : 8 Pin Machine Tooled IC Socket

IC2: 74LS244

IC3 : 78M05 Positive Voltage Regulator

R1,R2,R4,R5,R6,R7 : 33R 1/4W Resistor

R3,R8,R9 : 10K 1/4W Resistor

D1,D2,D3 : 1N4148 Diode

D4 : 1N4001 Diode

C1,C2 : 100n Capacitor

C3 : 100uF Electrolytic Capacitor

X1 : DB25 PCB Mount Male Connector

This programmer supports: ST Micro M25(E), ST Micro M45(E), Macronix MX25L, Atmel AT25FS, Atmel AT25DF, Atmel AT25F, Amic A25LxxP, Amic A25Lxxx, Eon EN25(B/D/F/P) read only, Winbond W25X, Winbond W25Q (OTP), SST SST25(LV/VF)xx, SST SST25VFxxxB, Spansion S25FL and ESMT F25L.

Download Complet Project: Spi Flash Programmer

SOIC to DIL 8 Adapter

TehnikService — Thu, 03 Mar 2011 13:36:28 +0000

I needed this adapter to read the contents of EPROM on a Panasonic phone, and so I found this link here and built this adapter.

Download PCB Board in PDF: SOIC to Dil 8 Adapter

Amplifier With LM386

TehnikService — Wed, 02 Feb 2011 09:51:07 +0000

Today we did an project amplifier with LM386. This amplifier is very easy to make and very compact, works with a single power source whose value can be between 4V and 12V.It is based on the use of a type LM386 amplifier, capable alone to issue a power of several hundreds of milliwatts to a load (HP) of 8 ohms, while consuming only a few mA at rest. Ideal for make a small portable battery powered amp.For an application in stereo, just to build this amp in two examplaires.

About LM386:

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to

keep external part count low, but the addition of an external

resistor and capacitor between pins 1 and 8 will increase the

gain to any value from 20 to 200.

The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent

power drain is only 24 milliwatts when operating from a 6 volt

supply, making the LM386 ideal for battery operation.

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an externalresistor and capacitor between pins 1 and 8 will increase thegain to any value from 20 to 200.The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescentpower drain is only 24 milliwatts when operating from a 6 voltsupply, making the LM386 ideal for battery operation.

Autor: Remy

Download complet project: Amplifier With LM386

Fastest Finger with PIC16F628

TehnikService — Sun, 23 Jan 2011 14:43:14 +0000

Today we make a new project Fastest Finger with microcontroller PIC16F628 from this link.

This simple circuit has five buttons and five LEDs. Four keys are linked with players, the fifth provides manual reset.

After switching on or after reset (reset, manual or automatic), all the LED off and the system is ready.

One of four players who were consigned to quickly see the button of its own LED light and all other keys are immediately blocked. The PCB file is provided in pdf format.

The hex code is also included in the downloadable project file.

Autor of this project is Remy – Mr Sonelec.

Download Complet project: Fastest Finger PIC16F628

VGA Tester with PIC16F84

TehnikService — Sat, 15 Jan 2011 23:35:01 +0000

Finally I found some time to create a project, I explored the google and I found one page with an interesting scheme on VGA interface.

So I made the pcb with eagle and I made it with the toner transfer method.

This project uses few parts, one microcontroller PIC16F84, one capacitor 100pf, one resistor 1k and one crystal 4MHz.

When for the first time would go turn on tester on the screen will appear message “TEST”.

More photos on Tehnik Service Facebook Fan Page.

Download complet project: VGA Tester PIC16F84

Digital ESR Meter

TehnikService — Thu, 30 Dec 2010 12:03:08 +0000

This ESR Meter I made it somewhere in 2007, and now I have only made the box still miss him to make him a mask. A lot of it is accurate and now for now is doing great. I made it from magazine Emiter 6nr 2004 year, the PCB can be bought from the magazine is not expensive basic 3e a PCB for the display is 1 euro, and the magazine is 2euro.Autor of this great project ESR Meter is Blagoj Kupev. More photos on Facebook Fan Page.

Multicolored LED with CD4093

TehnikService — Fri, 05 Nov 2010 01:02:20 +0000

This project is a floor lamp that can take the color and brightness as desired. Adjusting the brightness of each group is provided by a generator whose frequency is fixed but whose duty cycle (temporal relationship between high and low) is variable, much more efficient than setting current variation in LEDs. It consists of a fixed frequency oscillator and variable duty cycle for each of three colors. Each oscillator operates independently, which helps determine the degree of brightness of each red, green and blue. For this project I made a PCB using toner transfer method. More photos on Facebook Fan Page.

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Download complet project: Multicolored Led CD4093

Author: Mr. Sonelec

10 Channel Chaser for 12V/60W lamps with PIC16F628A

TehnikService — Wed, 12 May 2010 23:13:34 +0000

This project allows instant start sequentially but a dozen low-voltage lamps 12 V / 60 W, and makes them fade and always sequentially (but slower). This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function: – When crossing a light barrier by a visitor, the lights one after the other along the path before him, as to “show the way”. – After a few minutes (the visitor is supposed to have happened at the end of the alley), dimming of each of the spots, one after another in the same direction of travel, as “comet tail”. The lights dimming is not provided by the PWM, although this would undoubtedly possible, but by a simple function of discharge capacitors.

Adjusting the time of ignition or extinction
The time that elapses between ignition of each spot and the time lag between their extinction can be adjusted individually. It is thus possible to obtain a speed and a rapid start off slow speed, or vice versa. This project has three modes of operation, among which one can switch from one to another with push button SW3 / program:

- Mode 1 = Mode = Normal mode is switched – off LED D13.

- Programming Mode Mode 2 = start time – D13 LED lit.

- Mode 3 = Programming Mode extinguishing time – D13 LED lit.

If you want to change the interval start time or time of extinction you can find here on the autor page.

More photos on Facebook Fan page.

Download complet project: 10 Channel Chaser with PIC16F628A

Autor: Mr.Sonelec

This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function:
- lors du franchissement d’une barrière lumineuse par un visiteur, les lampes s’allument les unes après les autres le long de l’allée, devant lui, comme pour “montrer le passage”. – When crossing a light barrier by a visitor, the lights one after the other along the path before him, as to “show the way”.
- après quelques minutes (le visiteur est censé être arrivé au bout de l’allée), extinction progressive de chacun des spots, les uns après les autres, dans le même sens de défilement, façon “queue de comète”. – After a few minutes (the visitor is supposed to have happened at the end of the alley), dimming of each of the spots, one after another in the same direction of travel, as “comet tail”.

Battery Level Indicator

TehnikService — Fri, 07 May 2010 22:07:28 +0000

This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we find the nodal point R1 / R2, a voltage of 2 V (12 V 10 V).This voltage is sufficient to produce in R2 and the base of transistor Q1, allowing current to saturate the transistor Q1, which then has its collector voltage close to 0 V. The transistor Q2 is blocked, the LED D2 is turned off.
On this link a few explanatory lines on the choice of component values, starting from the right of the diagram (LED D2) and up to the left (Zener diode D1). More photos on Facebook Fan Page.

Download : Battery Level Indicator

Autor: Mr. Sonelec