Hobby Electronics Basics

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overcurrent

recently,an AC-DC converter,when it regenerate to net,often overcurrent.by reset is ok. anyone has this exprience plz he...
0 comments posted 18yrs
posted by cope2008
0 comments posted 18yrs posted by cope2008

5V regulator for Li-Ion Battery

Does anyone know of self contained 5V regulator for a 2 cell Li-Ion battery that will also protect the battery from ove...
1 comments posted 18yrs
posted by 1qazse4
1 comments posted 18yrs posted by 1qazse4

Help with replacing an AC adaptor

Can you replace a transformer with an input rating of 120VAC 60Hz 12W and output rating of 12vdc 500mA with one that ha...
6 comments posted 18yrs
posted by webmaster
6 comments posted 18yrs posted by webmaster

simple power switching circuit

Hello, I am working on a small project using a pic microcontroller that I want to have run for months at a time. I can...
6 comments posted 18yrs
posted by non
6 comments posted 18yrs posted by non

building a linear slide potentiometer?

Can anyone explain how to (or where to find instructions) build an accurate linear slide potentiometer of 100k, 150k or...
22 comments posted 18yrs
posted by mad.scientist.jr
22 comments posted 18yrs posted by mad.scientist.jr

What limits the current in an unloaded transformer?

I got to do some experiments recentley and I realise that my understanding of transformers has some holes..... First I...
7 comments posted 18yrs
posted by alanfredperry
7 comments posted 18yrs posted by alanfredperry

What happens when electrolytic capacitors 'dry out'?

I hear about this a lot when it comes to old amplifier equipment. "The caps were dried out in my 1971 Doumaflauuchi Qua...
11 comments posted 18yrs
posted by blahbleh666
11 comments posted 18yrs posted by blahbleh666

photoresistors

a silly question that google can't seem to answer... are any LDRs available that will _reduce_ resistance as light _inc...
7 comments posted 18yrs
posted by isaacdover
7 comments posted 18yrs posted by isaacdover

PICs and Vss/Vdd

Browsing the datasheets, I notice some varieties of PICs have multiple Vss and/or Vdd pins; must they *all* be connecte...
11 comments posted 18yrs
posted by randy.day
11 comments posted 18yrs posted by randy.day

Alkaline and rechargeable batteries and devices

Hi, I heard something but i want to make sure that i experienced that: If i use non-alkaline rechargeable batteries (i...
6 comments posted 18yrs
posted by kimiraikkonen85
6 comments posted 18yrs posted by kimiraikkonen85

Understanding multimeter readout

I recently bought a 43 range multimeter in my bid to learn how to restore old radios, When testing a modern carbon film...
10 comments posted 18yrs
posted by the1930s
10 comments posted 18yrs posted by the1930s

Max voltage safe for all electronic devices?

Hi: What is the maximum voltage possible *without* doing any of the following to any extent?: 1. Exceeding the dielectr...
22 comments posted 18yrs
posted by glucegen1
22 comments posted 18yrs posted by glucegen1

HD44780 is it programmable/OTP

I am wondering if this chip is a microcontroller or just PLD I have an LCD (LM16255) with it and OKI M5259 but I can't...
3 comments posted 18yrs
posted by sambo
3 comments posted 18yrs posted by sambo