Electronic Hobby

Simplest Continuity Tester

2011-07-28T15:12:00.001+07:00

This is probably the simplest continuity tester in the world. Used for emergency circuit test when no AVO meter is available. R 100 ohm can be replaced (or even omitted) with any resistance size depend on your convenience.

Baby Urinate Detector

2011-07-19T12:00:00.001+07:00

This device will sound when the sensor plate is poured by water or high moisture condition. Applicable for baby urinate detector. The sensor plate can be replaced with a piece of sheet sewed by conductive wire. Sewing lane should not follow the pattern/format as shown in the picture. Just make sure that the wires are not connected each other. No power

Voltage Doubler

2011-07-19T11:11:00.001+07:00

This simple 555 application will double the input voltage. It's created by "charge-pump" circuit with a 555, diodes, and capacitors.

One lamp operated by four and more switches

2011-06-09T14:48:00.000+07:00

This circuit is for controling one lamp through one and many different places. You need to provide two SPDT switches (for two locations) and additional DPDT switches for additional location for controling the lamp.

Satellite Yamal 202 ~ Batam's Blog

2011-05-16T19:04:00.005+07:00

Satellite Yamal 202 ~ Batam's Blog Click here to view this post in English --------------------------------------------

Simplest Audio Amplifier - LM 386

2011-05-16T13:12:00.002+07:00

My simplest amplifier project. Only few parts needed, since many components are integrated in the LM 386. Check the data-sheet of LM 386 here. Enclosed in the diagram, my own matrix PCB design. I used it to amplified low audio signal from my TV and connect it with an earphone. Need this additional circuit to match the output with the earphone impedance.

VHF Booster Schematic

2010-10-13T11:29:00.001+07:00

The quality of this VHF booster seems not better than the one sold in electronic stores. Look at the picture! Only a few parts needed to finish it. Anyway, the result was more than I expected. Most of VHF local and foreign TV (Singapore and Malaysia) can be enjoyed clearly. I lived in north part of Indonesia, in a three angle border between Indonesia, Singapore and Malaysia. That's why TV

3V FM Transmitter

2010-10-12T13:29:00.002+07:00

Hi… I’m back! I have been ignored this blog for long periods since I was busy with my other activities. This is my last bug project. Works well on 88-108 MHz frequency. It already published on my paid Blog, http://myelectronickit.com. Unfortunately the Blog is already suspended since the hosting provider ran away. All data that I have been created and published for almost one year in the

How to power off the computer

2010-01-27T16:34:00.001+07:00

Shutting down the computer through start menu is only powering down the computer main devices. The power supply of the CPU (also the monitor power supply) and a few electric components are still running. We call this situation as “Standby”… or “The computer is on standby position”. Do you know how many watts of electric

Simplest Sonar

2010-01-13T16:07:00.001+07:00

SONAR stands for Sound Navigation Ranging, and is a technique for determining the distance and direction of objects by acoustic means. Although SONAR is usually associated with navigation ranging under water, it may also be used to good effect in air – for instance, to detect boats in a fog. SONAR may be divided into three categories. 1. Active SONAR Projects a sound wave and waits for the

Middle Range FM Transimtter

2009-11-19T10:49:00.001+07:00

The transmitter circuit described here consist of two parts. Its called as the Oscilator stage and an extra RF power amplifier stage to raise the power output to 200-250 milliwatts. The circuit built around transistor T1 (BF494) is a basic low-power variable-frequency VHF oscillator. A varicap diode circuit is included to change the frequency of the transmitter and to provide

Voltage Regulator

2009-10-23T11:28:00.002+07:00

I'm using this power supply to power on my FM transmitter

Video Transmitter

2009-10-23T11:09:00.004+07:00

Works between 76 and 108 MHz frequency. You may replace 2SC2000 with : 2SD734, C930 or the equivalent type. Inductor L1 = 5 mm diameter of air coreSize = 0.8 mm enameled copper wire The turns are depending upon the frequency you want, 5 - 4 turns: 40 - 90MHz3 - 2 turns: 100 - 180MHz Simply turn on the TV and set to a blank frequency...

FM Transmitter #2

2009-10-22T15:47:00.003+07:00

This series of transmitter consists of three parts ... oscillator, buffer #1, and buffer #2. Quality of the oscillator is quite satisfactory, stable and produces a strong signal. The first part to assemble is the oscillator. Once finished, turn on the FM radio on an empty wave. Turn on the transmitter / oscillator. Turn the ferrite core (L1) to the left / right until the radio hissing

CD Rom Power Supply, Dual Power Supply

2009-10-21T11:57:00.000+07:00

This power supply is usefull to powered a CDRom. Just connect the audio out from CDRom to HiFi Amplifier. You'll need below Power Supply : Use atleast 3 Amp. of Transformator and place Q1, IC1, 2 , and IC 3 on a cooler plate. Have a nice day :-)

DC to AC Inverter

2009-10-19T11:54:00.005+07:00

Having bad experiences during electric powered off? Just connect Battery from your car/motor bike to this device...that will help you turn on fan or any other appliances at your house. >> Stop thingking how to start your car tommorow morning!! :-) ... just kidding. This DC-to-AC inverter schematic produces an AC output at line frequency and voltage. The 555 is

Make Your Own PCB

2009-10-19T11:43:00.001+07:00

Simple trick to make your own PCB. After finishing PCB layout drawing, print it on a photo paper using laser printer . Patch/attached the print result on the copper side of the PCB Add a few layers of cloths. Rub gently and smoothly using a hot iron. Detach the photo paper from the PCB See... the printout transferred to

Remote Control Extender

2009-10-19T10:46:00.003+07:00

For example, you have two TV sets and one Satellite receiver. One TV and satellite receiver located in bedroom while the other TV placed in living room. TV in living room parallelly connected with satellite receiver output at bedroom, meaning what you see on bedroom TV will be the same with program on living room TV. If you watching TV in bedroom, it is okay... you can

SWG and AWG to mm CONVERSION TABLE

2009-10-18T23:02:00.004+07:00

SWG : Standard Wire Gauge AWG : American Wire Gauge Sometimes, you'll need to make your own coil when you build a radio transmitter or receiver. But you will find all the wires diameters in SWG or AWG unit. For converting to mm, you can use two tables below:

VARIABLE POWER SUPPLY

2009-10-17T23:12:00.002+07:00

Need a stable, variable voltage output and simple power supply? here is what you looking for… The output range is between 1.5 to 30 Volts depending of your transformer. I’m using a 5A transformer with 34 Volt output. The voltage regulator LM317T is critical. Cover it with best cooler plate. Value of D2 depends of your transformer capacity. Have a nice day!!

3 VOLT FM TRANSMITTER

2009-10-17T11:30:00.001+07:00