Hobby Electronics Basics

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Charging two batteries?

--Curious to know if there are any know downsides to stuffing an extra 12v battery in a car, hooking it in parallel wit...
12 comments posted 18yrs
posted by steamer
12 comments posted 18yrs posted by steamer

Cockroft-Walton generator

Hi all, I am trying to build a simple half-wave CW generator (aka Villard cascade) for my Physics class. At the moment,...
12 comments posted 18yrs
posted by cloudguitar
12 comments posted 18yrs posted by cloudguitar

Back In The day?

A long while ago Radio Shack once had some power PNP ad NPN transistors that both came in a TO-5 metal casing. Those we...
2 comments posted 18yrs
posted by ryon
2 comments posted 18yrs posted by ryon

MK 484 Radio - Tuning Capacitor Value?

I found a website that has construction details for a radio using the MK 484 IC. The site doesn't seem to say what vari...
5 comments posted 18yrs
posted by the1930s
5 comments posted 18yrs posted by the1930s

RMS voltage of a square wave

I was wondering if I take the RMS voltage of a messy looking square wave, a noisy square wave, with some measurement de...
37 comments posted 18yrs
posted by panfilero
37 comments posted 18yrs posted by panfilero

Amp Power Supply

I'm building an amplifier for my iPod, based on two LM380 chips, I was wondering if you could parallel the two amplifie...
2 comments posted 18yrs
posted by the1930s
2 comments posted 18yrs posted by the1930s

iPod Chargers Question

Why is it that some USB chargers cannot charge the Apple iPods? I tested multiple USB charges, and only those that say "...
2 comments posted 18yrs
posted by titani
2 comments posted 18yrs posted by titani

max7480 chip

hello I am trying to use the filter max7480, I made the circuit as per the datasheet. But i am getting nothing in the o...
1 comments posted 18yrs
posted by lerameur
1 comments posted 18yrs posted by lerameur

Hall effect sensor

Hello I hope I can clear up some confusion about reading specification sheet on hall sensor. First the UGN3503U chip. o...
9 comments posted 18yrs
posted by lerameur
9 comments posted 18yrs posted by lerameur

Battery backup

Hi All I have a setup with 8051 micro controller and I want to provide a battery backup so that when power fails the mi...
10 comments posted 18yrs
posted by clueless
10 comments posted 18yrs posted by clueless

Maximum load current for 74HC device?

How much total current can be drawn from a typical 74HC device? I see specs that state the ground current cannot exceed...
5 comments posted 18yrs
posted by wrongaddress
5 comments posted 18yrs posted by wrongaddress

volume control for clock

Hello, I have an electronic quartz clock with chimes that needs a volume control. It has a 2 1/4 speaker and is way too...
6 comments posted 18yrs
posted by news
6 comments posted 18yrs posted by news

CFL interfering with TV remote?!

Will a CFL interfere with a TV remote (I guess I mean "normally")? The new flat screen I purchased for my bedroom seems...
5 comments posted 18yrs
posted by daughtrym
5 comments posted 18yrs posted by daughtrym