Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Ground as far as it has ever concerned me is the base voltage that all others in your circuits are relative to. This is why your Ford would have a +6 ground. +12 Vdc in a circuit only means +12 from your base voltage, so if you have a power supply providing 30v and 42v, you can run 12v...
Hello everyone!
I have etched a great deal of circuit boards with etchant and sharpie markers, but I was intruiged when I was reading a post in this form regarding using printed transparencies and photo sensitve PCB boards. I've seen some of the products in Jameco's catalog for this, but...
You could also try taking input from an accelerometer, such as this one from Crossbow: **broken link removed**. I used a three axis once to build a system to gather very detailed information on my decents when I would go downhill biking, and was able to find out my forward velocity at any given...
I don't know, it depends on the amount of cooling you'll need to get your 5 degrees. Anyway, I bet you could even use a computer liquid cooling system (the processors heatsink on the ignition module, the 120mm radiator in front of your car's radiator). I don't know if that would be enough...
Perhaps you could mount an additional radiator in front of or behind your existing one if there is room. Fill it with water and get a 12v water pump. then pipe it to you ignition module and come up with some creative way to get a lot of pipe surface area to touch the ignition module. I'm not...
Program
Hey, I was just wondering what program was used to genereate the schematic in the original post? I have Visio right now and I hate it more and more on a daily basis (it works great for my databases but for electrical engineering it blows) especially after I found out how it numbers IC...
Sorry about that. To answer your question, a 555 could be triggered by logic 1 by driving its Vcc (pin 8 ) through an NPN transistor from the logic source. a 4017 could be incremented by falling edge by connecting the monostab to a PNP transistor that would have its emitter connected to the...
The method suggested actually would work fine. Just clock the 4017 ( prolly multiple of them chained) at a rate of say, one eigth note at 120 bpm. Then for a quarter note connect two consecutive 4017 pins to the same tone generator, with diodes. Then for an eigth rest leave a pin diconnected...
A nice microcontroller that will work for applications where integer mathematics is sufficent and where program execution speed isn't critical is the Parallax BASIC Stamp 2.
https://www.parallax.com/detail.asp?product_id=BS2-IC
There is lots of online programming documentation available...
Follow Up
Hey guys! Just a follow up! Got this sucker built, from concept to the box in the pics in just five days! And I was able to do that beacuse of all your help; Thanks again, everyone!
Board:
**broken link removed**
Box:
**broken link removed**
**broken link removed**
John,
Interesting that I see this kind of request, because I was actually discussing the building of an radiation detection circuit with my physics professor. He has a design that involves an aluminum can, argon gas, and the scrapings off the mesh that burns in a gas lantern. I have no idea...
Hey what chip is that? And will it work with a PS/2 keyboard? I want to build a program for my Rabbit Core 2000 that will read the input for a PS/2 magnetic card reader and unlock a door. Everything is pretty simple, except for getting the data from the card reader. I figured I'd just have...
Your matrix will take p = r + c pins, where p is pins and r is rows and c is columns. Anyway so a 40 key matrix could take 14 pins set up as a 10 by 4. There are shift registers available that chain, and you would just need to make sure you have a large enough variable to store the number you...
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