Tehnik Service » Circuit

StorageBot

TehnikService — Fri, 27 Apr 2012 08:29:29 +0000

StorageBot – voice controlled robotic parts finder.

The hardest parts to find were always those rare miscellaneous parts that were thrown somewhere into a “junk” bin. StorageBot solves the location problem by listening to your voice commands, processing the location of parts from a master database and then delivering the matching bins in a manner that only a robot can do!

Build your own StorageBot instruction is here.

Via:[Hacknmod]

Turntable Photography Equipment

TehnikService — Wed, 11 Apr 2012 12:28:17 +0000

That kind of photo is actually an animation that consists of several photos of the same product but from different angles. It means that we need a device that can be controllable and that could take pictures on even intervals.

Roughly, the device consists of PIC16F628A microcontroller, USB<->Serial PL2303 converter IC, ULN2803A IC transistor array, 2 opto-couplers and one stepper motor. Electronics are powered from USB port, actually from a PL2303 PCB Module, and motor is powered by independent 12V power source.

Source: elektronika.ba

Mini Drill Motor Regulator

TehnikService — Fri, 23 Mar 2012 20:03:59 +0000

A mini-drill machine is always needed in drilling the PCB (Printed Circuit Board).
It is usually powered by batteries that limit the drill’s capacity.
Using a power supply adapter with a speed regulator like the one featured here can certainly improve the performance of the drill.
With the help of this revolution regulator circuit you can control the number of revolutions of your drilling machine.
The speed regulator can maintain the speed of the drill no matter what load is encountered by the drill.
This projects measure the electromotive force (EMF) of a spinning drill motor to conclude the speed of the motor’s rotation.
Typically a motor takes power in the form of voltage and current and converts the energy into mechanical energy in the form of rotation.
With a generator, this process is simply reversed. A generator takes mechanical energy and converts it into both electrical energy with a voltage and current. Most motors can be generators by just spinning the motor and looking for a voltage/current on the motor windings.
The operation amplifier of IL723M monitor the voltage of generated EMF in real time.
I used Wheatstone bridge for comparing two different voltage: one voltage generated by EMF of motor and second:the serial resistance of resistors networks Ra + Rb.

The current sense resistors is R2. It’s measure the current through the drill machine.
The Wheatstone bridge is powered by very stable reference voltage inside integer circuit IL723M.

The complete instruction, schematic diagram et all
you can find in EMITER 3/2012,
follow the link: http://www.emiter.com.mk/poveke.php?napis_id=3971
Author: Primarius D-r Petar Avramovski, MD

Inductive charger for electric toothbrush

TehnikService — Sun, 26 Feb 2012 16:21:50 +0000

Inductive charging uses an electromagnetic field to transfer energy between two objects.

This is usually done with a charging station.

Energy is sent through inductive coupling to an electrical device (base of toothbrush),

which then can use that energy to charge batteries in arm of toothbrush.

Induction chargers typically use an induction coil to create an alternating electromagnetic field from within a charging base station,

and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery.

The two induction coils in proximity combine to form an electrical transformer.

The resonance frequency in our project is 66KHz. It’s generated by astable multivibrator generated by NE555.

The arm of the tootbrush receive the EM field and convert by diode and capacitance in DC voltage for charging the inside battery.

The full story in EMITER 2/2012: http://www.emiter.com.mk/poveke.php?napis_id=3940

Write Primarius D-r Petar Avramovski.

Temperature controlled soldering gun with bar graph indication

TehnikService — Thu, 26 Jan 2012 18:52:00 +0000

This soldering station is designed to control the temperature of soldering gun Solomon SL-1 and other similar soldering devices with integrated thermocouple. DC voltage generated by thermocouple is amplified by operation amplifier CA3140.
The precise regulation and excellent small hysteresis of temperature is obtained by voltage stabiliser LM723M (military packaging). LM723M contains an embedded temperature stable reference voltage source with its own of constant current.
Visual indication of SET or READ temperature is realized by LM3914 and 10 LED bar graph display to represent of temperature range from 50 to 500 degree Celsius.
The electric circuit of soldering iron heater is optical insulated from control electronic circuit by CNY17 optocoupler.
However, this is an accurate device for regulation of your soldering iron and precise indication of the temperature.
I constructed it and I did it. Built it and you, do not wait.
8 years of continuous operation without a single malfunction of the device is sufficient confirmation of its quality.

The complete instruction, 3 PCB, schematic diagram et all you can find in EMITER 12/2004, follow the link: http://www.emiter.com.mk/poveke.php?napis_id=1582

Author: Primarius D-r Petar Avramovski, MD.

Simple Function Generator

TehnikService — Sun, 22 Jan 2012 22:19:38 +0000

Generator functions, or forms of waves, such oscillators are producing alternating voltages of different shape which correspond in appearance to a mathematical function.
They can be sine, rectangular, triangular, in the form of stairs, etc.. Applied in analog and digital electronics, the measurement and experimental techniques, for educational or professional purposes and as a laboratory device are always welcome in your electronics lab.
The text that follows we suggest a project for a very simple generator functions realized by IC CD4011.

No-electronics hobbyists (the readers of Emiter) who does not wish to have or who did not indicate a need for generating functions in his laboratory for electronics.
My old desire – to build the generator functions with Intersil integrated function generator ICL8038 – not true.
This specialized integrated circuit for that purpose, back in 1984, it was quite expensive and hard to find.
So I decided to build a function generator with conventional CMOS integrated circuit that is popular, cheap and easily available, the circuit CD4011. The device successfully and works well and I was benefited countless times in my elektronics practice.

Author: Primarius D-r Petar Avramovski MD,

-writer to magazine Emiter.
The complete article you can read on the pages of the Emiter 01/2012:
Follow the link: http://www.emiter.com.mk/poveke.php?napis_id=3910

LED candle for Christmas tree

TehnikService — Mon, 26 Dec 2011 19:28:51 +0000

The small electronics with a few transistors and a few passive components will revive a dozen of small LED sparks
deployed in the shape of the flame of the Christmas tree candle .
Failed attempt to blow off the flame, like a birthday cake, now become reality. Accumulated air in the children’s swollen cheeks
make magic explosive “puff” and when “flames” from the candle out gradually, children eyes shine with delight and curiosity:
How is that possible?
A small microphone which is placed at the bottom of the pcb under the led diodes,
it converts sound pressure into voltage and the serial transistor switch off.

Author: Primarius D-r Petar Avramovski, writer to magazine Emiter.
The complete article you can read on the pages of the Emiter 12/2011.

Folow the link: http://www.emiter.com.mk/poveke.php?napis_id=3891

VGA to VIDEO Composite converter

TehnikService — Mon, 19 Dec 2011 21:56:20 +0000

If you want to connect your PC to your house cinema, built VGA to VIDEO Converter.
The device is suitable for watching movies, performing video presentations and advertisements from a computer
that does not have video composite output signal.
Conversion is a stable, high resolution and high image quality in terms of brightness, contrast and saturation of colors.
Most sophisticated solution for converting VGA signal into composite video signal is application of the integrated circuit AD724.
Column is the product of electronic company Analog Devices, referred to as RGB to NTSC / PAL Encoder.
AD724 is basically an encoder that converts red (R), green (G) and blue (B) component of the signal
in their respective color signals corresponding to light (luminance) and color (chrominance) in accordance
with prescribed norms and NTSC/PAL standards.
The existing VGA to video converter in nothing behind commercial video cards posed a PC slot in personal computers
to provide an output video composite signal.
Given the fact that the cost of integrated circuit AD724 is only 6-7 dollars, then you win with quality / price ratio.

Author: Primarius D-r Petar Avramovski, writer to magazine Emiter.
The complete article you can read the pages of the Emiter 11/2011,

follow the link:
http://www.emiter.com.mk/poveke.php?napis_id=3863

Automotive Led Timing Strobe

TehnikService — Sat, 10 Dec 2011 20:15:47 +0000

Most older engines, and many newer ones, have timing marks in the form of a line marked on the rim of the vibration damper.
Some engines in front-wheel drive vehicles have timing marks on the flywheel. A pointer is attached to the timing cover.
When the mark is exactly under the pointer, the engine is ready to fire number one cylinder.
The spark will occur with the rotor pointing to the number one cap terminal.
The timing is generally set by using a strobe tamp, which is a light that is operated by high voltage surges from the spark plug wire.
The strobe lamp usually referred to simply as a timing light.

A useful timing strobe can be constructed using 9 high-brightness LEDs and a few common components: 2 monostable (CD4098), 1 double operation amplifier (CA3240E)
and 3 transistors.
Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup.

Author: Primarius D-r Petar Avramovski, writer to magazine Emiter.
The complete article you can read the pages of the Emiter 11/2011

DIY PIC16F883 Development Board

TehnikService — Fri, 07 Oct 2011 21:29:34 +0000

Phil from jumperone.com he wanted to try to write software for Microchip PIC16F883 microcontroller and he couldn’t find simple development board for it. And so he decided to made own development board.

Source: jumperone