Hobby Electronics Basics

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varistor calculations needed

Hi to newsgroup I have a problem that needs some assistance. I have a 220V 50 HZ industrial relay at 20 amps. The armin...
21 comments posted 17yrs
posted by michaelnikolaou_remove_me_
21 comments posted 17yrs posted by michaelnikolaou_remove_me_

Design Help 2 - Please NO PIC

I'm still waiting for my newark order so I went ahead and worked on the 555 solution. Based on the suggestions I got I...
32 comments posted 17yrs
posted by james
32 comments posted 17yrs posted by james

Problems about pic thermometer

Now I am doing a pic thermometer which use the LM19 temperature sensor to measure the temperature and display on the 2*...
6 comments posted 17yrs
posted by ntacao998
6 comments posted 17yrs posted by ntacao998

Neo Geo Arcade board problems

I have about four Neo-Geo six slot arcade game boards with Video RAM errors. It is not the actual video RAM, that much...
1 comments posted 17yrs
posted by uriahsky
1 comments posted 17yrs posted by uriahsky

Turning a 10k Pot into a 100k Pot

Is it possible to multiply resistors to turn a 10k Pot into a 100k Pot. Breakdown of what I'm trying to do: Got an RC c...
11 comments posted 17yrs
posted by zool_vamp
11 comments posted 17yrs posted by zool_vamp

Protecting a power supply

I've got a new power supply that I will be using to anodize aluminum. The supplier says to protect it when using it in...
19 comments posted 17yrs
posted by paulinlapine
19 comments posted 17yrs posted by paulinlapine

Printer Port Connectors "DB" and "db"

I picked up some female DB25 to db25 connectors that I'll need to install in the walls of of some project boxes, that I...
9 comments posted 17yrs
posted by Searcher7
9 comments posted 17yrs posted by Searcher7

basic power supply

I want to built a basic power supply with 6 7[89]?? regulators. I have a line transformer capable of supplying 31VDC (1...
17 comments posted 17yrs
posted by gabjsmo0
17 comments posted 17yrs posted by gabjsmo0

IR Temperature Sensor

I am attempting to construct a temperature sensor that will activate several relays when the thermometer senses tempera...
10 comments posted 17yrs
posted by tranerm
10 comments posted 17yrs posted by tranerm

Battery discharger - will this work?

The circut is here: http://drop.io/kuv9yi5 The idea is to discharge a NiMH AA cell at 500ma down to the point where the...
19 comments posted 17yrs
posted by gh424NO824SPAM
19 comments posted 17yrs posted by gh424NO824SPAM

Computer Case fans

So I bought a case from someone off of craigslist but it didnt come with rear fans. How can I tell which size i need
4 comments posted 17yrs
posted by kingeric2206
4 comments posted 17yrs posted by kingeric2206

opening and closing doors

I'm fairly new to the internet and recently, I;ve been hearing sounds of doors opening and several minutes later, closi...
7 comments posted 17yrs
posted by flynncraft315
7 comments posted 17yrs posted by flynncraft315

Audio-grade low-voltage op-amp

I'm looking for a low-voltage op-amp to be used as a difference amp to provide DC coupling to a USB sound card. So far,...
5 comments posted 17yrs
posted by N0Spam
5 comments posted 17yrs posted by N0Spam

Measuring science fair motor current ?

I helped a friend's 10 year old son build a science fair motor: a coil of wire (20t around a pill bottle former) suppor...
4 comments posted 17yrs
posted by ehsjr
4 comments posted 17yrs posted by ehsjr