PUSHBUTTON

Pushbutton merupakan sebuah device untuk menghubungkan dan memutuskan rangkaian listrik antara 2 titik. Penggunaan pushbutton dikehidupan sehari-hari hampir menyentuh semua bidang. Di bidang komputer dengan keyboard dan mouse, dibidang otomotif dengan panel-panel kontrolnya, bahkan diperalatan rumah tangga sekalipun seperti kontrol peralatan listrik juga menggunakan push button.

1. Aktif high pushbutton

Aktif high pushbutton merupakan pushbutton yang memiliki karakteristik saat tidak ada penekanan maka dalam keadaan terputus(off) sedangkan saat ditekan akan tersambung(on).

2. Aktif low pushbutton

Aktif low pushbutton merupakan pushbutton yangmemiliki karakteristik saat tidak ada penekanan maka dalam keadaan tersambung (on) sedangkan saat ditekan akan terputus (off).

Kita bisa membuat kedua jenis pushbutton hanya dari push on saja. Perhatikan schema berikut:

HP TX1000 Entertainment Tablet PC GPU Fix

A friend of mine ask for a favor to take a look at his HP TX1000 Entertainment Tablet PC blackout LCD problem. I have no idea on how to fix this until I found below video.






Instead of using bulb, I used a heat blower to re-flow the chip.







From my observation, there is a the gap between the GPU and the heat sink was join by a burned thermal conductive silicone sponge.







I replace this with an aluminum foil folded a couple of times to get just the right thickness.








After reassemble it back together and now, the moment of truth, Hey! it works! :-)



Thanks a lot jasonshay2. You really save my day.

8 watts tube amp stereo

all schematic elektronik,elektronik skema, amplifier, fm transmitter,tube schematic,skema tabung, transistor data set,

8 watts tube amp stereo

Download File schema HERE

schematic elektronic tube and transistor

Schematic Tube Power amplifier 6v6 watt

This circuit is similar to the 6V6 Amp except that it has two channels. It puts out about 10 watts into 8, 4, or 2 ohms. Tubes used are 6SN7, 6V6, and 5U4. Negative feedback is taken off the output transformer's secondary.


WARNING!

Tube circuitry uses lethal amounts of current at high voltages. Be extremely careful when constructing any types of tube circuitry. Here are some tips for building circuits safely:

When testing circuits, do not stand on metal or anything grounded.

When measuring voltages in the circuit, use only one hand.

Never work on a circuit while it is plugged in.

Discharge filter capacitors through a resistor after turning off the circuit.

Wait for tubes to cool before handling or removing.

Use common sense and don't do anything stupid.

Note: I am not responsible for injury or death as a result of carelessness in the construction of the circuits on this site.

Download File schema HERE

schematic elektronic tube and transistor

Schematic tube Power amplifier 3 watts

3 Watt Amps


These two power amplifiers are almost identical except for the brand of power transformer. Tubes used are 6BM8 and 6X4. Output power is about 3 watts into 8 ohms. The output pentode is connected to a 40% ultra-linear tap on the output transformer.

WARNING!

Tube circuitry uses lethal amounts of current at high voltages. Be extremely careful when constructing any types of tube circuitry. Here are some tips for building circuits safely:

When testing circuits, do not stand on metal or anything grounded.

When measuring voltages in the circuit, use only one hand.

Never work on a circuit while it is plugged in.

Discharge filter capacitors through a resistor after turning off the circuit.

Wait for tubes to cool before handling or removing.

Use common sense and don't do anything stupid.

Note: I am not responsible for injury or death as a result of carelessness in the construction of the circuits on this site.

Download File schema HERE

schematic elektronic tube and transistor

How to "Delete administrator Password" without any software

Method 1

Boot up with DOS and delete the sam.exe and sam.log files from Windows\system32\config in your hard drive. Now when you boot up in NT the password on your built-in administrator account which will be blank (i.e No password). This solution works only if your hard drive is FAT kind.

Method 2

Step 1. Put your hard disk of your computer in any other pc .
Step 2. Boot that computer and use your hard disk as a secondary hard disk (D'nt boot as primary hard disk ).
Step 3. Then open that drive in which the victim’s window(or your window) is installed.
Step 4. Go to location windows->system32->config
Step 5. And delete SAM.exe and SAM.log
Step 6. Now remove hard disk and put in your computer.
Step 7. And boot your computer :-)

P16PRO40 programmer strip board layout

What is P16PRO40? It is a programming tool for several types of PIC micro controller. I'm not sure the origin of it, but I found it here at http://www.winpicprog.co.uk/ while browsing. The schematic can be found here at http://www.lpilsley.co.uk/pdf/p16pro40.pdf.



Since I saw a several request for P16PRO40 strip board layout, so I decided to share it here.





My PIC programming tool is a strip board based (AKA Veroboard). It is not as compact & neat as the commercial programmer but guess what, It took only 2 hours for me to built it from my electronic junkyard, except the 74LS05 and of course the strip board it self. Use normal IC socket if you don't have a ZIF socket.







I have made some modification to the circuit to match what I can find on my electronic junkyard. I replaced BC557 with A1015 (PNP), note that both transistor don't share the same pin layout. Just be careful if you want to use the alternative transistor.







On the power supply circuit, I've remove 7808 regulator since I already have 13V power supply. I only use 7805 to produce the 5V Vcc and the 13V Vpp comes directly from the main power supply.



I've also remove Vpp40 on/off from my PIC programmer. I've no plan to use them in the near future.



The programmer has been tested to work with 16F84A & 16F628A.



The recommended software for this programmer is WinPicProg 1.91 from http://www.winpicprog.co.uk/. It is simple but reliable software for PIC programming.





If you are using 74LS05 or 74LS06, set your 'hardware' setting as below. They are both HEX Inverter Open Collector output ICs but 74LS06 has extra features = with Buffer/Driver and 30V output.





Below is my test circuit, just a simple blinking program to test it out.

---

Additional images ...