LED Schematic

1. Simple LED Flasher - Simple LED flasher by using Nutchip.
2. AC Powered LED Schematic - Light up LED by using AC supply.
3. LED Chaser - Simple LED light chaser.
4. Two Transistor LED Flasher - Flashing LED by using transistor.
5. 16x16 LED Matrix - Prototype of 16X16 LED
6. Battery powers white LED driver
7. LED Moon Light
8. Tri-color LED Controller with Serial Interface 
   

CATV Upstream Fiber Optic Receiver

Upstream fiber links in a community antenna television (CATV) system are usually among the most difficult elements of the network to align properly.Set-top boxes and cable modems employ "long-loop" automatic gain control (AGC) (in other words, far-end power-control), which attempts to normalize the RF path end-to-end.

Alignment is very important because for every decibel of uncorrected optical loss, there's a 2-dB optical-modulation-index (OMI) variance at the transmitting node.

Thermal Fan Controller

The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. This circuit designed to be use for 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so a small power transistor will be fine as the switch. I used a BD140 (1A, 6.5W), but almost anything you have to hand will work just as well.

Doubler Voltage with ne555 schematic

This circuit shows a doubler voltage with ne555 schematic.

This be Simple Doubler Voltage circuit, from voltage 12VDC to be 24VDC.

By use Timer IC highly popular the number NE555 and other equipment a little again.

It can give current get about 50mA convenient for the circuit, that use low current the small-sized.