Hobby Electronics Basics

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What is line current ?

I have a 10 hp power water pump which on 420 volts 3 phase, my calcalation would be 12.8 A line current, which mean eac...
7 comments posted 18yrs
posted by mowhoong
7 comments posted 18yrs posted by mowhoong

Question on Printed Circuit Boards and gauge size

I was recently playing around with a breadboard using 22 gauge wire, I guess the best wire choice for my breadboard. If...
1 comments posted 18yrs
posted by ultralightbackpacker
1 comments posted 18yrs posted by ultralightbackpacker

Where to start with microcontrollers?

So here is the deal, I'm a self taught computer nerd and wish to mess around with small electronics and microcontroller...
21 comments posted 18yrs
posted by somuchbadkarma
21 comments posted 18yrs posted by somuchbadkarma

instantaneous current limits in dc motors?

Wondering if there is some rule of thumb for instantaneous current limits in DC motors? I think I read somewhere that 3...
6 comments posted 18yrs
posted by brandon.joseph.moore
6 comments posted 18yrs posted by brandon.joseph.moore

Anyone knowledgeable about SD cards

I have an SD card in a camera. I want to use a controller to work the camera. The construction of the camera doesn't le...
10 comments posted 18yrs
posted by default
10 comments posted 18yrs posted by default

Snubber

Hi all I want to start a motor remotely. The contactor coil is rated 240 volts and I am driving it with the contacts of...
12 comments posted 18yrs
posted by clueless
12 comments posted 18yrs posted by clueless

Tube Headphone Amp

Hi, I'm interested in building a simple tube stereo headphone amp, I found a circuit but have a few questions. Link to...
8 comments posted 18yrs
posted by the1930s
8 comments posted 18yrs posted by the1930s

Help! Protect IGBTs

Please see a quick first draft of a high current capacitor discharge cicuit, to be used for a can crusher, ring thrower...
0 comments posted 18yrs
posted by amdx
0 comments posted 18yrs posted by amdx

Garmin 45 software update ?

Hello, Due to low batteries , my GPS has lost all its datas ... and also it seems the 1999 software update ( EOW rollov...
0 comments posted 18yrs
posted by personne
0 comments posted 18yrs posted by personne

Help : resistance

Pls help how to calculate the total resistance at point x,y Thanks. ------ R1 ------ - ------ R3 ------ | | | | | | x --...
19 comments posted 18yrs
posted by kcuskn
19 comments posted 18yrs posted by kcuskn

Minimal size 5V/100mA power supply

Hello, I'm designing a matchbox-termometer. It will consist of a 7-segment indication, PIC16F88 (18 pin) and TC77 - SPI...
10 comments posted 18yrs
posted by ivanatora
10 comments posted 18yrs posted by ivanatora

Scope doesn't show correct voltage?

Scope: Tek 2465 Sig gen: HP 33120 The HP, set to 25 KHz, 100 mV p-p (according to the HP's display). The Tek, set to 50...
4 comments posted 18yrs
posted by not
4 comments posted 18yrs posted by not

What size fuse to use?

I've got a solenoid with 8 ohms of resistence. Its AC and don't know where to go to find out how I'd determine what siz...
2 comments posted 18yrs
posted by clannorm
2 comments posted 18yrs posted by clannorm