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Monday, December 3, 2018

Electronics TL-Lamp 12 volt DC

By David Bradbury
The circuit shown in Figure below has been designed to drive an 8Wfluorescent lamp from a 12V source, using an inexpensive inverter based on the ZTX652 transistor. The inverter will operate from supplies in the range of 10V to 16.5V, attaining efficiencies up to 78% thus making it suitable for use in on-charge systems such as caravans / mobile homes/ RVs as well as periodically charged systems such as roadside lamps, camping lights or outhouse lights etc. Other features of the inverter are that it oscillates at an inaudible 20kHz and that it includes reverse polarity protection. Circuit Operation The 270W and 22W resistors bias a ZTX652 transistor into conduction, where the positive feedback given to the transistor byW1 drives it into saturation, thus applying the supply voltage across W2. This causes a magnetizing current to build up in W2 until the transformer’s ferrite core saturates. When this happens, the base drive given to the transistor by W1 decays, causing the transistor to rapidly turn off.

Transformer winding using ferite transformer here:

Sunday, November 16, 2014

How to Repair Fan Motor

If you have broken fan motor because of broken winding stator you can fixed it with easily just buy ones the winding stator motor like this. In my country it is about Rp 78.000 ($78).

But you must check the same size and type. And then wiring of the stator motor connect to cables like this:
Wiring normalnya adalah sbb:
White Cable:  is main (center)
Capasitor: 1. Red <==> BLUE cables [of stator cables]
                2.Black  <==>  Oranye cables [of stator cables]
3 other cables for speed control

In this case I fixed fan merk of Miyako with feature: Remote control:
1. On-Off
2. Speed control of 3 condition
3. Timer: 1/2, 1, 2, 4 minutes combination sleep timer
4. Speed model : sepoi and others

complete remote control circit at here

Sunday, August 10, 2014

USB to Serial Converter Home Made without Microcontroller IC - No need programming

USB to Serial converter home made without IC microcontroller or no need programming can realization using special IC for that. It is TF 232 BM. For more explanation will shown in this circuit:

At the PC side you need driver software (winxp and lower) but for win7 up no need driver.

Complete Circuit/Driver/Schematic can download at HERE

Most of today's PCs and notebooks began to leave the serial port and switch to USB. The use of USB is more practical because in addition to its speed higher, this port has a 5 volt voltage source that can be used to provide resources on an electronic system that is connected to it. While today most electronic devices are still using the port RS232 communication with PC media. To bridge these problems  so many products launched USB to RS232 which makes electronic devices is still detected as COM (RS232 port) on the PC or notebook. Old software that was previously still using COM does not need to be changed  again because the device is still considered to communicate with COM (Port RS232) But most of USB products on the market toRS232 still using 12 Volt +/- level on the microcontroller whereas RS232 can only use TTL level 0 / + 5Volt just so needed IC MAX232 again to communicate with this module. 

RS232 Converter production has TTL level 0 / + 5 volts on the RS232nya so it can be connected directly to the microcontroller system without using a MAX232.
Installation HOME MADE USB - Serial Converter:
- Connect the USB cable to a PC's USB port and USB port Home Made this circuit
- Power LED indicator will indicate the presence of active voltage source Module enters the This circuit
- Windows will ask for the driver of the module to be installed

Driver installation step by step:

To testing connection use Hyperterminal

Step Down Power Supply Up to 30A Output

This circuit is so simple for step down power supply with the one IC controller like this

Key Features

    • Fully-encapsulated dual step-down switching power supply
    • Up to 100W output from a 17mm square PCB footprint
    • Dual 15A or single 30A output
    • Up to 95% conversion efficiency
    • 4.5V to 20V input voltage range
    • 0.6V to 6V output voltage range
    • 1.5% output voltage accuracy with differential remote sensing
    • Up to six modules may be paralleled to support 180A output current
    • Output over-voltage, over-current and over-temperature protection
    • Full power operation without heat sinks or fans
    • QFN package with exposed leads permits easy probing and visual solder inspection


The ISL8225M is a fully-encapsulated step-down switching power supply that can deliver up to 100W output power from a small 17mm square PCB footprint. The two 15A outputs may be used independently or combined to deliver a single 30A output. Designing a high-performance board-mounted power supply has never been simpler -- only a few external components are needed to create a very dense and reliable power solution.

Automatic current sharing and phase interleaving allow up to six modules to be paralleled for 180A output capability. 1.5% output voltage accuracy, differential remote voltage sensing and fast transient response create a very high-performance power system. Built-in output over-voltage, over-current and over-temperature protection enhance system reliability.

The ISL8225M is available in a thermally-enhanced QFN package. Excellent efficiency and low thermal resistance permit full power operation without heat sinks or fans. In addition, the QFN package with external leads permits easy probing and visual solder inspection.


    • Computing, networking and telecom infrastructure equipment
    • Industrial and medical equipment
    • General purpose point-of-load (POL) power


If you need high voltage or more headroom, you can move to the ISL8240M dual 20A/single 40A step-down power module, which is pin-to-pin compatible with the ISL8225M, and is well suited for power hungry ASIC, FPGA and microprocessor loads in infrastructure systems. Current sharing and phase interleaving allow up to 6 modules to be paralleled for up to 240A of current. 

Monday, May 19, 2014

AC Led from 220V AC Line

This circuit will show you how to build your own balm with diode LED AC line 220V/50Hz. This circuit is so simple just make DC current from the AC line trough bridge diode, but you must READ carefully its DANGEROUS seriously is HOT CIRCUIT make sure to be carefull.

It can be output 3 Watt or 5 Watt and read the C1 value for it. If  3 watt LED can flow 40 V DC 16 serial LED C1 must be 1000nF/400V. The ouput 5 watt C1 must be 1200nF/400V  the led be serial 24 LED.

The result:

Thursday, January 23, 2014

TV Remote Control Jammer

In this circuit I found from DMohanKumar site, so thi circuit copy Right to him.In simple explanation this circuit will produce frequency at 38Khz be transmitter by Infra Red, This 38Khz frequency will jamm the frequency of remote control of your TV box. For valid and frequency tunning just adjust VR potensiometer as variable resistor

Monday, September 23, 2013

IC LM 555 as eazy and cheap TIMER

IC 555 most popular as multivibrator and can design as easy and cheap timer like this circuit. The TIME that you want as timer be calculate:


A relay timer circuit using the 555. On pressing the switch the relay is activated for a time determined by 1.1R∗C, where R∗ equals 100k plus the setting of the 470 kW variable and C is the capacitor value that has
been selected by the switch. Note the use of diodes to prevent latch-up and damage to the IC when the relay isswitched off.

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