Hobby Electronics Basics

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HELP needed with relay bounce

Hi All I've been trying to construct a pressure regulating device, using a 12v latching solenoid and conventional valve...
7 comments posted 21yrs
posted by chris.knight
7 comments posted 21yrs posted by chris.knight

Transistor Duty Cycle

Can you overdrive transistors in the same way you can overdrive LEDs, if you keep the duty cycle low? I need to drive 1...
6 comments posted 21yrs
posted by ecmcn
6 comments posted 21yrs posted by ecmcn

Re: International standards

Hi, > For instance, the plugs in the US or Australia could not even make it to > market in Europe, they are not safe en...
509 comments posted 21yrs
posted by ximac
509 comments posted 21yrs posted by ximac

phase lock loop (PLL)

hi i choosed the VCO resistor & capacitor According to the formula ( f min= 1/(R2(C1+32pf)), f max =(1/(R1(C1+32pf)))+f...
3 comments posted 21yrs
posted by rbiras
3 comments posted 21yrs posted by rbiras

Unbalanced to Balanced ?

My guitar pre-amp has no balanced output . The main amp I want to use only has a balanced input . Input instructions of...
4 comments posted 21yrs
posted by sorry.spam
4 comments posted 21yrs posted by sorry.spam

Banana Jacks

I am trying to find a Banana Jack to "mount", for lack of a better word, on the end of a wire. All the banana jacks I c...
7 comments posted 21yrs
posted by 1qazse4
7 comments posted 21yrs posted by 1qazse4

the best way to solder on a remote control platine

Which is the best way to solder on a remote control platine? I want to switch the power key with a relay and know I have...
7 comments posted 21yrs
posted by Tommi-Vogel
7 comments posted 21yrs posted by Tommi-Vogel

Metal lead found ?

When i am solding my hobby kit( a AM radio), i drop the 8 ohm speaker on the fioor, surpise me the magnet in the speake...
4 comments posted 21yrs
posted by mowhoong
4 comments posted 21yrs posted by mowhoong

PIC Microcontroller Kit

I am looking for a recommendation on a PIC mircrocontroller kit. I want to make a timer to control several devices conn...
8 comments posted 21yrs
posted by norm.ackroyd
8 comments posted 21yrs posted by norm.ackroyd

A timer question

Hi, I need help to get a one-shot pulse generator with both positive and negative trigger input. 555 timer only takes n...
6 comments posted 21yrs
posted by songtao32
6 comments posted 21yrs posted by songtao32

new at this

Intro to transformers: A transformer has 20 primary windings and 100 secondary windings. If the secondary voltage is 25...
5 comments posted 21yrs
posted by ppcblaster
5 comments posted 21yrs posted by ppcblaster

how to tell if a bettery is leaking?

hi all, newbie question here... I was wondering if there was a definitive way to tell if a battery (nicad/ li-ion or wh...
0 comments posted 21yrs
posted by gavin
0 comments posted 21yrs posted by gavin

USB Question

I have a CNC machine that uses a pentium computer for the brains. The CNC software does not use windows and I believe w...
7 comments posted 21yrs
posted by etpm
7 comments posted 21yrs posted by etpm