Computer circuits

Computer

PC based Frequency Meter, The Simplified I/O Interface, VGA to TV Scart...


Analog switch expands I2C interface
Perhaps the most effective way to gain board space and increase component density is to minimize wiring on the board. A widely used architecture that allows such miniaturization is the I2C bus.
Connecting Dump Terminal
Some applications may not need user display and key interface, dump terminal is an alternative way for program setting, displaying user interfacing command.
Driving Stepper
M1 is a stepper taken from an old disk drive. There are five pins, i.e., common, coil 1, 2, 3 and 4. Resistance measured between common pin and each coil is about 75 Ohms. Driving current for each coil is then needed about 60mA at +5V supply. A darlington
Monitor Splitter
A Simple Splitter Driving Two (or even more) PC Monitors.
Parallel Port Relay Interface
Here is an example of controlling a relay from the PC's parallel printer port (LPT1 or LPT2).
PC Serial Port Receiver
This circuit was designed to control a 32 channel Christmas light show from the PC serial port.

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