Hobby Electronics Basics

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Placement of resistors with LEDs

Hi Does it matter where one places a resistor on a circuit with a battery and LED. I mean I understand that charge flow...
1 comments posted 19yrs
posted by shelton.dcruz
1 comments posted 19yrs posted by shelton.dcruz

LC notch filter not working!

Hi, I am trying to filter out a 13.56 MHz signal (and if possible I would want to filter some of its harmonics in succe...
4 comments posted 19yrs
posted by mrhyde377
4 comments posted 19yrs posted by mrhyde377

Old Capacitor Codes?

I have second hand word that a specific capacitor is a Z5U 1000M 1KV. This doesn't follow the standard 3 digit capacito...
31 comments posted 19yrs
posted by grant
31 comments posted 19yrs posted by grant

2pole Rotary Switch and Diodes HELP

Original Question Can anyone recommend a rotary switch, transistors, Ic's, or any component that may work for following...
9 comments posted 19yrs
posted by piscatory
9 comments posted 19yrs posted by piscatory

usb flash controller

Hi, I have question about usb flash controller. I'm trying to design my own usb stick. So, which usb flash controller y...
0 comments posted 19yrs
posted by zoiree
0 comments posted 19yrs posted by zoiree

LM386 (audio amp) oscillates

I have a LM386 that oscillates when the volume is turned up too far. It's operating with the default gain of 20 and the...
13 comments posted 19yrs
posted by wrongaddress
13 comments posted 19yrs posted by wrongaddress

building a digital optical protractor

i am needing to measure the angle of an arm. I would like the readout to be very accurate to .001 degrees. Has this bee...
9 comments posted 19yrs
posted by rcwells
9 comments posted 19yrs posted by rcwells

Switches in Series Combination?

Use a 2 pole rotary switch to give you the combinations, and use diodes for the selection of any 2 switches or any one....
4 comments posted 19yrs
posted by piscatory
4 comments posted 19yrs posted by piscatory

Easiest PCB creation

Any ideas on a simple way to create a PCB board? All I'm trying to do is connect 5x2 headers to 10 pin SIPs and I'm get...
11 comments posted 19yrs
posted by news
11 comments posted 19yrs posted by news

Blown resistor in automotive latching relay

Hi all. This is my first post to this NG forum, so please be kind. I am trying to repair a 12v latching relay for my Vo...
14 comments posted 19yrs
posted by vw
14 comments posted 19yrs posted by vw

NEC ratings for a simple device?

A customer wants to use one of our thermocouples in a Class II Div 1 environment (i.e. it must be dust-ignition proof)....
1 comments posted 19yrs
posted by thomas
1 comments posted 19yrs posted by thomas

Why the common emmiter

hello every body, i have a quistion. Why do we use the common emmiter ?
36 comments posted 19yrs
posted by yehia3
36 comments posted 19yrs posted by yehia3

Will the LM393 drive a small relay?

I need to switch on a relay with the output of the LM393. The relay is a 5vdc unit from RadioShack. Does the LM393 have...
1 comments posted 19yrs
posted by oneillrj
1 comments posted 19yrs posted by oneillrj

Using a relay

I got a relay I cant figure out how to use, it as 5 connectors. Its a finder 36.11.9.005.0000 5V(dc) 10A 250V(ac), I do...
12 comments posted 19yrs
posted by nospam
12 comments posted 19yrs posted by nospam

Apply voltage for X seconds

Does anyone know of a quick way to make a circuit closed for a certain period of time after it receives a signal? It's...
12 comments posted 19yrs
posted by tcpatter
12 comments posted 19yrs posted by tcpatter