Hobby Electronics Basics

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Pressure transducers

I'm trying to learn about pressure transducers and I've learned a tiny bit on the web, but not found it as fruitful as...
3 comments posted 20yrs
posted by quakeserver149
3 comments posted 20yrs posted by quakeserver149

Freeware port analyzer

Is there a freeware windows port analyzer that basicaly just lets you "record" the data off the parallel or serial port...
17 comments posted 20yrs
posted by Abstract.Dissonance
17 comments posted 20yrs posted by Abstract.Dissonance

PCB Sensitivity to UV exposure?

I just had a thought.. if pcb's are made by exposeing them to UV light. Followed etch bath. Could sunlight later on comp...
23 comments posted 20yrs
posted by pbdelete
23 comments posted 20yrs posted by pbdelete

18 Stage LED counter with variable stages?

Hello, I'd like to build Bill Bowdens 18 stage LED sequencer (http://ourworld.compuserve.com/homepages/Bill_Bowden/page...
2 comments posted 20yrs
posted by derwarst
2 comments posted 20yrs posted by derwarst

4X4 matrix keypad-74c922- source code

hi...... im trying to interface a 4x4 matrix keypad using a 74c922 decoder to an Atmel micrcontroller ...in c- programm...
4 comments posted 20yrs
posted by latha79
4 comments posted 20yrs posted by latha79

Using DB9 RI Pin to receive simple signal

I'm developing a simple DB9 Serial Port bicycle computer. The cadence and the speed was easy, as I had the diagram (htt...
0 comments posted 20yrs
posted by jb1566
0 comments posted 20yrs posted by jb1566

AM index improvement

Hi, I'm a software engineer and not really comfortable with electronics. May be some of you could help me with the foll...
2 comments posted 20yrs
posted by Rutger
2 comments posted 20yrs posted by Rutger

Fuses

Howdy: I have 3 power supply circuits that I am going to put in one box. Each draws less than 1 amp off the primaries,...
10 comments posted 20yrs
posted by horacewallace
10 comments posted 20yrs posted by horacewallace

Dynamic Resistance

I stumbled upon the notion of dynamic resistance of the p-n junctions. I'm pretty good at calculus so I understand what...
3 comments posted 20yrs
posted by nospam
3 comments posted 20yrs posted by nospam

Simple question: what type of switch is this

I'm sure this is a very simple question, but I'm now all confused as to which is double-pole double-throw and all that....
13 comments posted 20yrs
posted by mlevin77
13 comments posted 20yrs posted by mlevin77

7 Segment LCD Display

Im using crocodile physics to simulate a circuit in which it counts up to 9 and displays it on a 7 segment display. I a...
4 comments posted 20yrs
posted by mirza1867
4 comments posted 20yrs posted by mirza1867

How do I make a constant current load?

I'd like to design a constant current load that can handle 0-5A and resolvable to 100mA or possibly 50mA for testing th...
3 comments posted 20yrs
posted by itsme.ultimate
3 comments posted 20yrs posted by itsme.ultimate

Keyboard and Video interfacing

I was thinking about trying to do a project that involves a PC keyboard(and maybe mouse) and possibly a PC video monito...
9 comments posted 20yrs
posted by Abstract.Dissonance
9 comments posted 20yrs posted by Abstract.Dissonance

High Side VS low side

http://www.national.com/pf/LM/LMD18400.html I do not understand what the High Side Drive really is doing? It says on pa...
3 comments posted 20yrs
posted by Abstract.Dissonance
3 comments posted 20yrs posted by Abstract.Dissonance

Current source with BJT

I've found many schematics of simple current sources with a single BJT. But what I notice is that both BJT junctions ar...
6 comments posted 20yrs
posted by nospam
6 comments posted 20yrs posted by nospam