Tuesday, August 18, 2009

Cervical Mucus Before Menstrual Cycle

phase motor controller Infrared Barrier

This circuit is designed to test low voltage AC motors and power, for example those used in PC hard disks or the CD player.
The circuit works by generating a cyclic burst of pulses in the three coils, thus achieves the rotor displacement.
You add a speed control to tune the engine more responsive.
The main blocks are based on 555 timer, this timer control motor speed. The sequencer on the basis of 4017, with the blast generated sequences for the three coils, and finally the stage of power based on power transistor TIP31C NPN (should dissipate).
The circuit is as follows:

Wednesday, August 5, 2009

How Many Hours In A 3.7v 400mah

Full

The following circuit is an infrared barrier, designed to apply to a central alarm, had several versions, this is 2.0 which differs from the 1.0 per carry greater distance.
Version 1.0 was almost the same as this but instead of having a driver based on the ULN2003 transistor array, only had a 2N3904 transistor and 4 IR LEDs. 1.0 In the receiver
was equal to this but instead of having an infrared module three terminals, had only one photo transistor and a filter.
This new version 2.0 works just like 1.0 but to have 14 infrared emitters and a receiver three-terminal semi amplified, we can achieve greater range, of course we can also add a lens on the receiver and much larger.
Performance, is based on two integrated firm HT12D Holtek HT12E and already used in several projects of this blog. These two integrated
are 8bit and 4bit data encryption, both the encoder to the decoder.
in the circuit is not used all 4 channels but could be a new version of the circuit using these channels to create different areas to interconnect all sensors and each other.
The circuit is as follows: