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8 Line Intercommunication using 89c51

I find schematics for PABX/PBX home made
I think it's very interesting ..
This contains :

Main card:
In this card there is 89c51 micro controller is used. Micro controller is controller the DTMF encoder MT8870 and the Analog switch MT8816.

SLIC card:
In this card there is constant current source is used to activate the telephone. The lm339 is used to detect the hand off and hand on condition. There is same circuit are repeated because we have to interface the 8 telephone.

Summary:

When the telephone is hand on the output of the lm339 change, it is detected by micro controller that the telephone is hand on, then micro controller is make the analog channel by using the MT8816. the LM555 is used to generate the dial tone.

for complete visit thislink http://www.electronics-lab.com/projects/telephone/017/index.html

Sensitive FM Transmitter

Parts List:

R1,R3 = 10K       C1,C2 = 0.1uF      Q1,Q2 = 2N3904
 R2 = 100K         C3 = 0.001uF       L1 = see text
 R4 = 4.7K         C4 = 10-40pF
 R5 = 330 ohm      C5 = 4.7pF

Construction:
L1 is 0.1uH, 6 to 8 turns of 22-gauge hookup wire close wound around a 1/4-inch diameter non-conductive core such as a pencil.
The default for the capacitors type is ceramic, preferably the npo 1% type or equivalent. But basically nothing critical here. Use any capacitor you have laying around, but no electrolytic or tantalum caps. Only if you intend to use this circuit outside the home you may want to select more temperature stable capacitors like polyester types. Again, don't go out of your way to buy stuff, use what ever you can salvage.

If you decide to substitute transistors with something similar you already have, it maybe necessary adjust the collector voltage of Q1 by changing the value of R2 or R3 (because you change transistors, it changes this bias on the base of Q1). It should be about 1/2 the supply voltage (about 4 or 5v).

To find the signal on your receiver, make sure there is a signal coming into the microphone, otherwise the circuit won't work. I use an old mechanical alarm clock (you know, with those two large bells on it). I put this clock by the microphone which picks up the loud tick-tock. I'm sure you get the idea... Or you can just lightly tap the microphone while searching for the location of the signal on your receiver.

SMD FM transmitter

This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance of about 200 meters. Although it is low-power, it might be illegal in your part of country.
Depending on the electret microphone you use, you might have to tweek R4 to set the gain of the pre-amplifier. Depending on the Q of the LC-part (usually not very good when using off-the-shelf SMD parts) you may also have to re-bias the end stage of the circuit. For the coil you can use a ECM45T Series Inductor.

Build 2.4 Ghz Wifi Boster

its can boster your Wifi Very Good,it can gain at about 18dbi. I have tested and my Wifi can Connect to other Acces point as far about 10 KM , It's Cheap Trick to Bost your Wifi. I have Build it and spent money not more than $25.
you can see my photo ..