7400 contest – Page 8 – Dangerous Prototypes

7400 competition entry: New earth time (NET) digital clock

Our 7400 competition is heating up, Andrew form Ajax Electronics entered his New Earth Time digital clock into the competition. NET is a new way of telling time using earth’s rotation in degrees and minutes. 24 hours is 360 degrees, and each degree takes 60 NET minutes. The NET system allows for universal time with no time […]

7400 competition entry: Pure TTL clock

Here’s an entry in the Open 7400 Logic competition: Pure TTL clock A 24 hour clock built entirely out of TTL gates. The time base is a 32.768kHz quartz crystal.

7400 competition entry: Sychnometro Hz

Here’s an entry in the Open 7400 Logic competition: Sychnometro Hz by DolceVii

7400 competition entry: Capacitive Sensing, the Hard Way

Here’s an entry in the Open 7400 Logic competition: Capacitive Sensing, the Hard Way – 16 Channel Capacitive Sensor, RS232 Out

7400 competition entry: PCPU, homebrew minicomputer

Here’s an entry in the Open 7400 Logic competition: Homebrew minicomputer

7400 competition entry: Lazarus-64

Here’s an entry in the Open 7400 Logic competition: Lazarus-64 I like the idea of a 74x logic competition! Here is my entry, a retro computer that generates all video using ONLY 74hc logic parts… The latest version even has a 4 voice sound system, including a white noise channel made using a linear shift […]

Open 7400 Logic Competition: New judge

Marc Alexander from Freetronics will be joining the judging panel for the Open 7400 Logic Competition. There is still plenty of time to get your entry in.

7400 competition entry: 74LS00 based full wave rectifier

Noels entry for the Open 7400 Logic competition is a 74LS00 based full wave rectifier. I want to have an entry that it simple enough that other people can try out with their breadboards. Something that is easy to do, and yet feature a mis(use) of a typical 74LS00 IC.

7400 competition entry: Water level indicator

Arup made his first entry in the Open 7400 compettition. This is a simple water level indicator circuit which can be used to indicate water at 3 stages EMPTY, LOW and FULL by three respsctive LEDs. The heart of this circuit is a 4011 NAND IC. Via CircuitsDIY

7400 competition entry: Pen holder

Here is an interesting, but unusual entry: Pen holder I will admit that this may be an unusual project to enter, however as far as I can tell, it does not actually break any rules. It is a functional device in which the circuit (board) is mostly 7400 logic chips. It appears that it will run indefinitely without needing […]

7400 competition entry: Telephone Intercom from TTL

Here’s an entry in the Open 7400 Logic competition: Telephone Intercom from TTL This is the only craziest project I ever made, beginning in June 2007 and completed in November 2007. Very complex circuits, and uses a lot of IC (about 38 IC). If you think this is a waste, yes! Indeed. However, why do […]

7400 competition entry: 2 bits divider/multiplier

Here’s an entry in the Open 7400 Logic Competition: 2 bits multiplication and division This Project concerned to the Laboratory of Digital System has the objective to build a prototype which makes simple operations like multiplication and division between two operands of two bits. The operation result will be encoded in BCD (Binary Coded Decimal) […]

Open 7400 Logic Competition announcement: New Judge

We are pleased to announce that Dino Segovis from Hack A Week, will be one of the judges for the Open 7400 logic Competition. so keep hackin! and get your entry in.