CallID Unit based on Motorola MC68HC11A1P & MC145447P chips compatible with the standard protocols. if you got a multimeter and a phone you can start testing. Check the voltage across the pair, should be 48VDC in US, 60VDC in Europe. Place a 600 ohm resistor, 5W across the pair and measure the current should be 20 to 40mA (holding current) While on-hook the Ring will have a negative voltage and the Tip will be grounded through equipment...
This is a simple display controller. It can be controlled with a small microcontroller, such as MCS51, 68HC11, Z80, AVR and others.
Several years ago, I found an article that controlling a TV with only a PIC micorcontroller, and I surprised to it. It is very interesting to attempt to synthesize video signal with a micorcontroller.
However, it is not suitable for practical use because the microcontroller is occupied in synthesizing video...
The following are detailed schematics for the QScreen Controller. The QScreen Controller combines an embedded computer based on the 68HC11 microcontroller with a touch panel and LCD (liquid crystal display) graphic user interface ( GUI ) that is ideal for instrument control and automation. If you have any questions about the QScreen`s electrical o
The QCard Controller Single Board Computer ( SBC ) contains the Freescale 68HC11 microcontroller, RAM and Flash memory, digital input-output ( I/O ), and A/D. For more complete information about the QCard headers listed on this page, please see Getting to Know Your QCard Controller. Other pages in this QCard Controller Users Guide provide inform