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Category: Microcontroller Circuits / PIC Microcontroller This circuit is also crossed to: Clock Circuits Views: 3977 Rank: 0 The LM1881 separates the composite sync signal from the incoming video. The 74HCT4538A one-shot eliminates the vertical sync and equalizing pulses, to provide a nice clean horizontal sync. (Yes, Elantec makes some chips that do this in one package.) A 16.1 MHz signal from the VCO of a 74HCT4046 PLL is phase locked to the horizontal sync via the 74HCT4020 configured to divide by 1024. That 16.1 MHz signal then serves as a clock for the PIC. The PIC in turn operates the 74HCT4051 multiplexer at just the right moments to put the clock pixels up in place of normal video. Having the PIC syncronous with the video signal allows crisp overlaying with no jaggies.Someday I might get some PC boards made. The circuit can be built on a breadboard, but it tends to be flaky, owing to the extra capacitance. If it almost works on the breadboard, try shortening leads as much as possible. It it still only almost works, try soldering it up on an experimenter board. It works, I promise! The code is freely available for download. If you prefer, I can mail you a preprogrammed controller chip (you cover the cost of the chip and postage). visit page.  Someday I might get some PC boards made. The circuit can be built on a breadboard, but it tends to be flaky, owing to the extra capacitance. If it almost works on the breadboard, try shortening leads as much as possible. It it still only almost works, try soldering it up on an experimenter board. It works, I promise! The code is freely available for download. If you prefer, I can mail you a preprogrammed controller chip (you cover the cost of the chip and postage). http://dt.prohosting.com/pic/vidclock.html
Related circuits The RGB LED driver described on this page uses logic level 'N' channel MOSFETs which allow it to control LED arrays or lamps at up to 5 amps per channel without heatsinks. The driver uses exactly the same firmware as the small RGB LED driver shown in the photo so you can use the same code... This project can be used for many different purposes. Probably the most used application would be to interface to any electronic project that requires a keypad. There are several ready made keypads on the market, but those work with matrix connections and require 7 pins for a 12 button pad. For... I decided to implement this using a PIC 16F84 for both an encoder and decoder, and use RS-485 drivers (DS26C31 and DS26C32) to drive the 350m cable. I only needed five I/O pins per PIC, so this could have been implemented using the smaller 8pin 12C508 device, but the 16F84 has the advantage of... This program uses an 8 bit DAC along with a 16F84 PIC microcontroller to generate a keyed sine wave. The 16F84 uses an RC clock which can be varied (with a suitable potentiometer) to allow a variable frequency control for the sine wave output. A key or keyer output can be connected to pin 1 of... This loader connects the PC printer port and works with WinPic800. The loader gets DC supply from application board and provides +12V for high voltage programming mode. We can use it for programming many PIC chips easily. PIC-Tock is a video clock using a PIC16C61. In the tradition of Marv Newland`s "Bambi Meets Godzilla", there is far too much ROM space spent on credits, which are smooth-scrolled horizontally on the bottom of the screen. The hardware and video timing code are derived from PIC-Pong. The original... This is a simple use of the PIC 16F84 about a diode tester. Test procedure : We set «1» to PB0 and «0» to PB3. If diode is ok and opens, then at PA0 we have «1». If PA0 is «0», then the the diode has problem. With the program we manage what the PIC will do in each situation . If PA0 is... PIC plots pixels sans controller It is sometimes desirable to display the output of a PIC µC graphically, rather than numerically. However, the operation increases system complexity and expense. In addition to the LCD itself, you usually need a graphics controller and at least 1 kbyte of RAM. However, you can obtain a...
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