Electronics
Up next some cool electronic experiments.
Here are some projects that i made.
This is my electronic oscillator that i made, I have use it in some other electronic projects (picture 1.0).(tested)
This is a type of oscillator called an “astable multivibrator “. It is designed so that, when one transistor is on the other is off, and they continually switch back and forth, or vibrate, from “on” to “off”, circuit (picture 1.2).
Just like the one transistor oscillator, the frequency of the multivibrator is controlled by the combination of resistors and capacitors. You can change the frequency by changing the capacitors.
picture 1.0 My Astable Multivibrator
picture 1.2 Astable Multivibrator circuit
Homebuilt oscilloscope
How to make an oscilloscope out of a television. I personally build a Homebuilt oscilloscope using a small television that I found. The method is very simple and produces a dramatic effect. (picture 2.1 & 2.2) picture taken March 29 2008
picture 2.1 small television that will be modified
picture 2.2 setup of oscilloscope
Now going to the details, opening the television I located the defector coil assembly at the neck of the television tube, locating the four wires (two of which is the horizontal and the other two the vertical) finding out which are which, I then disconnected all four wires, run both horizontal and vertical wires out of the box using a external power source you can discover on how to move the electron beam. (picture 2.3)
picture 2.3 using a Astable Multivibrator and external power to make the beam move.
Making an AM transmitter
Schematic of making a low powered AM transmitter (see image 3.1), the transmitter have a range about 10 meter in diameter running in on 12v will also increases range, this also depending on your antenna.
image3.1 Very Detailed diagram
Here are the part lists:
Major Parts
1 – 680Ω (substitute: 470 Ω)
1 – 0.1uF
1 – 10k Ω
1 – 1602PNP transistor
1 – 10uF
1 – Audio output transformer (see detail)
1 – Ferrite core coil (see detail)
1 – AM/FM tuning capacitor
Miscellaneous
Antenna
Audio jack (audio input)
Details
1602PNP transistor can be substitute by some thing similar. (Try testing different PNP transistor till it works)
Audio output transformer, primary coil less turn than 2ndary coil. (See image 3.1)
AM/FM tuning capacitor the middle wire is the ground
Ferrite core coil (see image 3.3) that kind of coil
image 3.2 transmitter setup
image 3.3 transmitter circuit closeup
I’ll be making a video for this article in YouTube, just wait for more updates.