Avalanche pulse generator, and some scope porn.

By now we are all sure you know about Jim Williams’ avalanche pulse generator from his famous application note 47 we even posted about Kerry Wong’s pulse generator using jellybean transistors. And we can’t forget The EEVblog covering a build sent to him. Today we will be exploring our build, that is not quite like the others.

MicroCC microamp-range constant current source

MicroCC is a constant current source, but focused on the low current microamp range. It uses the Touchstone Semiconductor TSM6025 voltage reference, a drop in replacement for the MAX3025 with better than 15PPM stability. The TSM6025 used both as the reference voltage and regulator for a TS1001 op-amp (previously covered here) powered by a single 3volt CR2032 coin cell. […]

7400 Contest: 24 hours left

Reminder to all those interested in entering their projects into our Open 7400 Logic Competition: Entries must be received by October 21, 2011, 6AM GMT. You only have 24 hours left to send your entry in. Entering Entries can be posted on in our forum, on your personal blog, or even a handy how-to site like Instructables. When you’re […]

Open 7400 Logic competition: new sponsor Electronics-lab.com

Electronics-Lab.com has sponsord the Open 7400 Logic Competition, here is a list of what is being added to the prize pool. uOLED-32028-P1T graphics display module + P1-EB expansion module + uDrive-USB-G1 SD module + uUSB-CE5 module + 64MB microSD card + adapter BOOK: Programming & Customizing PICmicro Microcontrollers – Myke Predko BOOK: Switchmode Power Supply […]

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

New open 7400 competition sponsor: Freetronics

Freetronics has upped the ante for the Open 7400 Logic Competition by donating Two prize packages. EtherTen, LCD & Keypad Shield and a Terminal Shield USBDroid, LCD & Keypad Shield and a ProtoShield Pro Get your entry in and this and other cool hardware can be yours. There’s still time to become a sponsor of […]

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 […]

New Open 7400 Logic Competition sponsor: Adafruit Industries

Adafruit Industries is the latest sponsor of the Open 7400 Competition. Up for grabs is one of their new microtouch AVR development board. this and other prizes could be yours, but only if you get your entry in!

Open 7400 Logic Contest: 2 more Sponsors

Today we have 2 more sponsors joining us, Parrallax has provided us with a Boe-Bot Robot Kit and 2 BASIC Stamp Activity Kits. Xess has thrown in a XuLA-200 board with a VGA interface board. The prizes could be yours, all you have to do is submit an entry in the open 7400 logic Competition.

Open 7400 Logic Competition: new Sponsor and more Prizes!

We are pleased to announce that the Gadget Factory is now sponsoring the open 7400 logic Competition, This is right up any FPGA enthusiasts alley, Dangerous Prototypes is having an Open 7400 Logic Contest contest to see who can put together the best project utilizing 7400 series logic chips. There are many great prizes including an Arcade MegaWing with […]