Tehnik Service

Amplifier 30W

R1=1Kohm
R16-17=270ohm
D1=9.1V 0.4W zener

R2=47Kohm
R18=22ohm 1W
D2-3=1N4148

R3=1.5Kohm
R19=NC
Q1-2=BC550C

R4-5=10Kohm
R20-21=0.39ohm 4W
Q3=MPSA56

R6=5.6Kohm
TR1=250ohm trimmer
Q4=BC547B

R7=10ohm
C1=470nF 100V MKT
Q5=BC212

R8=47Kohm
C2=1nF 100V MKT
Q6=BC183

R9=560ohm
C3=68pF ceramic
Q7-8=MPSAO6

R10-11=8.2Kohm
C4-8=22nF 100V MKT
Q9=TIP141

R12-15=120ohm
C5-6-7=100nF 100V MKT
Q10=TIP146

R13=680ohm
C9=47uF 25V
F1-2=1.6AT FUSE

R14=330ohm
C10-11=220uF 63V
All the resistors is 1/4W 1% except quote differently [...]

Easy to use and cost effective.
Generates industry standard Gerber, Excellon and Pick and Place files for manufacture.
Can import a netlist from your schematic. Seven different formats supported.
Design rule checking – 32 rules in five categories.
Snap to objects, snap to grid and snap to guides for easy and accurate placement.
Comprehensive online help, includes tutorial and [...]

Amplifier 70W with TDA1562

U=14V

Printer Port Hardware Simulator

Do you need to test printers or other items of equipment that connect to a PC’s parallel printer port? This low- cost, easy to build circuit will let you test them quickly, without the need for a PC or test software. Basiacally, this device is a simple hardware simulator.
From magazine: www.epemag.co.uk

8 Watts PLL FM

8watts-schematics.rar PCB.rar HEX file.rar LCD .rar

PR4401 Led Driver

White Leds have a forward voltage drop of around 3.6V. If we wish to operate a white LED from a single 1.5V dry cell or 1.2V rechargeable cell we therefore need a voltage converter.The PR4401 from PREMA is a special purpose IC designed to drive a white LED.The device has just three connections and [...]

Car calculator Becker, Ford, Hyundai, BP

Car calculators.rar

200W Amplifier B Class

Dicing with Leds

FM Stereo Transmitter 0.5W

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

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: – [...]

Battery Level Indicator

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 [...]

Timer from 1 to 999s with PIC16F84A

This is a good looking and practical device that can be useful in many areas where countdown timer is needed. This project is based on the PIC16F84A microcontroller. The time range can be adjusted between 1 and 999 seconds. This project has 3 buttons and one of them is named Set Button. In order to [...]

8 LED VU Meter Project

A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]

12 Channel LED Chaser with PIC16F84A

Today we have a new category “Projects” and a new electronic project 12 Channel LED Chaser with PIC16F84A.
This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The [...]

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Tehnik Service blog launched in 2007. This blog is built for educational purpose to help you to be informed about all the news come from around the world in the field of electronics.