Hobby Electronics Basics

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Replacing Hall Effects Transistor

I just inherited an old MacBook G3 Laptop.The problem with the laptop is that it always thinks that the cover is closed...
4 comments posted 17yrs
posted by N
4 comments posted 17yrs posted by N

Circuit to indicate failure of a heating element

I have a water tank with with 2 x 5kW heating elements (on separate supplies). Problem is: one is probably just about e...
30 comments posted 17yrs
posted by ojcouzens
30 comments posted 17yrs posted by ojcouzens

Building a class A audio amplifier - no audio out

I tried to build this Class A amplifier circuit as a learning experience: http://www.techlib.com/electronics/audioamps....
68 comments posted 17yrs
posted by mrdarrett
68 comments posted 17yrs posted by mrdarrett

Touching up black anodized alu heat sinks

You're bound to get scratches and scrapes when you buy these in bulk. Even handling/installing them can result in occas...
14 comments posted 17yrs
posted by oparr
14 comments posted 17yrs posted by oparr

Trickle charging NiCads

I know this is an old topic and I've done a search, but couldn't find a satisfactory answer to the question: What would...
28 comments posted 17yrs
posted by pimpom
28 comments posted 17yrs posted by pimpom

Amplitude-to-Frequency and Visa Versa

Hi: Please don=92t get upset at me. I apologize profusely for posting something so similar to yesterday in a different...
1 comments posted 17yrs
posted by glucegen1x
1 comments posted 17yrs posted by glucegen1x

Is this device physically-possible?

Hi: Please don=92t get upset at me. I apologize profusely for posting something so similar to yesterday in a different...
9 comments posted 17yrs
posted by glucegen1x
9 comments posted 17yrs posted by glucegen1x

Maxim 712 NiMH Charger Cutoff Temperature

I built a NiMH charger based on the Maxim 712 chip some time ago. I didn't implement the temperature cutoff part of the...
1 comments posted 17yrs
posted by none
1 comments posted 17yrs posted by none

Is this device possible to make?

Hi: Does a device that performs the following conversions and modulations exist? If not, is it possible to construct? P...
14 comments posted 17yrs
posted by glucegen1x
14 comments posted 17yrs posted by glucegen1x

Metal sheet with breadboard

Hi All, I've got this breadboard from circuit specialists http://www.circuitspecialists.com/prod.itml/icOid/6885 and wh...
4 comments posted 17yrs
posted by mhelshou
4 comments posted 17yrs posted by mhelshou

Digital Electric Fence Tester?

Hi! I've got an electric fence with 1Hz high-voltage pulses (2kV-10kV). I'd like to monitor the voltage from the fence...
3 comments posted 17yrs
posted by torgil
3 comments posted 17yrs posted by torgil

Car engine RF interference

Hello all, thanks to the advice of Tom Biasi and Bob Masta, I was able to tap into the volume control of my vintage mon...
7 comments posted 17yrs
posted by biscuitbecks
7 comments posted 17yrs posted by biscuitbecks

Enco BS-0 dividing head

Does anyone have one of these? It would be handy for making a few details in a project I'm working on. I know I'm looki...
1 comments posted 17yrs
posted by clutch
1 comments posted 17yrs posted by clutch

Current measurement question

hello, I have to measure DC current through a range of about 100mA to 50uA, I need to make bi-directional current measu...
5 comments posted 17yrs
posted by panfilero
5 comments posted 17yrs posted by panfilero