Hobby Electronics Basics

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Transformer and Frequency

Hello, Short question: Why is it not possible to use an "normal" transformer for high frequency like 20 kHz? Why should...
4 comments posted 22yrs
posted by th.ahndorf
4 comments posted 22yrs posted by th.ahndorf

A question of sound knowledge

A student adds a sound output feature to their design using a small sounder (about the size of your little finger) driv...
10 comments posted 22yrs
posted by robin.pain
10 comments posted 22yrs posted by robin.pain

Unstable Switch mode supply

Hi. I have used the mic2183 chip as a switch mode power supply. I runs in stable mode until 12.15V, but suddently goes...
2 comments posted 22yrs
posted by jakob.j
2 comments posted 22yrs posted by jakob.j

Sensors

Help! I'm trying to build something which will measure the force something like a hammer hits an object. So, for exampl...
12 comments posted 22yrs
posted by studiodave30305
12 comments posted 22yrs posted by studiodave30305

eprom failure modes

I came across a new one today: eprom (27c512) programs fine, verifies fine, runs like crap. lots of errors. Same code i...
10 comments posted 22yrs
posted by fritzo_two_
10 comments posted 22yrs posted by fritzo_two_

passive mobile phone repeater

Asking mostly out of curiosity on this one. Some friends of mine live in a place in the mountains in Southern Spain. Th...
2 comments posted 22yrs
posted by news4
2 comments posted 22yrs posted by news4

antenna help

New to group. Hope this isn't too lame for folks- I have a cheap 'boombox' radio in my garage, and would like to improv...
1 comments posted 22yrs
posted by svirnala
1 comments posted 22yrs posted by svirnala

Capacitor codes help

Hi! I have some surface-mount capacitors I need to replace. I don't really understand the codes on them, despite lookin...
7 comments posted 22yrs
posted by jazzyogurt
7 comments posted 22yrs posted by jazzyogurt

PWM with SG3525

Hi, could anyone help me with SG3525? I have a PWM circuit with SG3525 and need to modify the circuit so that I can get...
1 comments posted 22yrs
posted by parkc23
1 comments posted 22yrs posted by parkc23

ESD level measurement

Radio reset when ESD was applied to certain exposed conductive pins. I would like to monitor the reset pin of the micro...
4 comments posted 22yrs
posted by ahkit1021
4 comments posted 22yrs posted by ahkit1021

mosfet failure

I'm using a BUZ10 n-channel mosfet to switch a 1 ohm electromagnet coil on and off. It's been working OK for a while, a...
12 comments posted 22yrs
posted by news4
12 comments posted 22yrs posted by news4

How to stop soldering iron tips from rusting?

Hi. My soldering iron (Antex CS 18W) tips seem to get rusted and pitted after a while. Any (sensible) suggestions on how...
12 comments posted 22yrs
posted by nospam
12 comments posted 22yrs posted by nospam

AC/DC Adapter

I Have an AC/DC Adapter that has a variable voltage settings. I figured i could use that to power my bread board. So i...
1 comments posted 22yrs
posted by tomtiv
1 comments posted 22yrs posted by tomtiv

Balanced grounding between devices & fault

I have designed a communication device that is being powered by 24V. It has two types connectors. The first provides th...
4 comments posted 22yrs
posted by eza
4 comments posted 22yrs posted by eza