Hobby Electronics Basics

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1500 W electric heater control

I've got a 110V, 1500 W immersion heater (similar to the kind used in electric water heaters). I'd like to control it a...
5 comments posted 18yrs
posted by mrdarrett
5 comments posted 18yrs posted by mrdarrett

RCD tester

Can someone just confirm my sums?? I want to put a resistor inside a plug to test the 30mA RCD. I reckon I need a 8k 10...
7 comments posted 18yrs
posted by colinstone
7 comments posted 18yrs posted by colinstone

AXION TV

I don't know if I am asking in the proper group.... but I have an Axion LCD 8 inch flat screen TV with a card reader. I...
2 comments posted 18yrs
posted by sandcrispies
2 comments posted 18yrs posted by sandcrispies

Junkbox DC-DC Converter

I worked up the circuit below to create an isolated DC supply, and it works (sort of). It's a 555 astable running at ~5...
6 comments posted 18yrs
posted by randy.day
6 comments posted 18yrs posted by randy.day

class A amplifier

Hello, First, I must say that I have not done analog electronics since a long time. So please be indulgent ! I want to...
134 comments posted 18yrs
posted by olivier.scalbert
134 comments posted 18yrs posted by olivier.scalbert

Simulating dependent sources

I'm writing a circuit simulation program as an exercise and I'm using the nodal method. The nodal method requires every...
2 comments posted 18yrs
posted by jerry
2 comments posted 18yrs posted by jerry

Simple voltage question

I'm trying to get a steady 5 volts from a 6 volt battery. The 5v will power a circuit that draws a variable amount of c...
2 comments posted 18yrs
posted by DorkyGrin
2 comments posted 18yrs posted by DorkyGrin

who knows about noises?

hi every body I have a signal generator thak works with 555 sometimes I see a a noise like digital FM that I think it f...
4 comments posted 18yrs
posted by erfan.talebzadeh
4 comments posted 18yrs posted by erfan.talebzadeh

Latchup? RS-485 receivers

I have a project where the input of an RS-485 receiver can have voltage on it before the main power supply comes on. My...
0 comments posted 18yrs
posted by grant
0 comments posted 18yrs posted by grant

TV with short circuit - how do I find the short?

A friend of mine gave me an old 27 inch TV that no longer works. Upon inspection of the insides, I noticed the "5A 125V...
17 comments posted 18yrs
posted by ssa3512
17 comments posted 18yrs posted by ssa3512

Switch Question

I haven't done any electronics in years so please excuse the simple question. Google made me confused. A device has two...
7 comments posted 18yrs
posted by MarkJerde
7 comments posted 18yrs posted by MarkJerde

Inflated PMPO figures

How do some manufacturers of audio amps arrive at the ridiculously high PMPO ratings they give for their products? E.g....
22 comments posted 18yrs
posted by pimpom
22 comments posted 18yrs posted by pimpom

The Nobel Peace Prize for 2008 to Martti Ahtisaari

The Nobel Peace Prize for 2008 to Martti Ahtisaari The Norwegian Nobel Committee has decided to award the Nobel Peace P...
0 comments posted 18yrs
posted by pthakur1966
0 comments posted 18yrs posted by pthakur1966

mosfets in critical condition

Let me guess... it's NOT normal for a mosfet to register < 40 ohms between D and S with no gate voltage applied... corre...
7 comments posted 18yrs
posted by mrdarrett
7 comments posted 18yrs posted by mrdarrett

How to use a differential amplifier ?

After some reading, I understand that a differential amplifier amplifies the voltage difference between the two inputs....
3 comments posted 18yrs
posted by jalbers
3 comments posted 18yrs posted by jalbers