Hobby Electronics Basics

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What is this cirquit used for?

Hi group I bougt a toy in the US which is operated by a lippo cell. The wall wart that came along wiht it is obviousely...
13 comments posted 19yrs
posted by m.zingg
13 comments posted 19yrs posted by m.zingg

Radio Telemetry

Are there any devices that do radio telemetry of up to a mile that are very small and use little power? (I'm not famili...
5 comments posted 19yrs
posted by Jon_Slaughter
5 comments posted 19yrs posted by Jon_Slaughter

Attenuating headphone side of 1/8" jack

I don't think this is possible, but want to run it by the experts: Using a standard 1/8 stereo headphone jack (http://t...
6 comments posted 19yrs
posted by N
6 comments posted 19yrs posted by N

555 timer 50% duty cycle

Hi, does anyone know how I could get a 555 timer to operate in astable mode at a 50% duty cycle? All the circuits I've s...
7 comments posted 19yrs
posted by panfilero
7 comments posted 19yrs posted by panfilero

Led falshlight with magnetic powering?

A friend has just received one of those flashlights which use LEDs. LEDs for lighting now very common now; so that was...
8 comments posted 19yrs
posted by tsanford
8 comments posted 19yrs posted by tsanford

Electrostatic field

Hi, As you know there is an electrical field around each electrostatic charge. I know how to create an electrostatic fi...
3 comments posted 19yrs
posted by mohammad.esmaeili
3 comments posted 19yrs posted by mohammad.esmaeili

quick piezo pickup question

Hey all; I have a piezo bridge/pickup for my electric guitar. I plan to wire it to a stereo jack, with one of the conta...
6 comments posted 19yrs
posted by toccata
6 comments posted 19yrs posted by toccata

How do you mount a pcb inside a case?

Hey I'm new to electronics! How do you mount a pbc inside a case? I've notice that the cases usually have some premade...
12 comments posted 19yrs
posted by no
12 comments posted 19yrs posted by no

Transmitting audio wirelessly?

Hello! I'm putting together the plans for my next electronics project, and the one thing I'm not sure if I can do is tr...
5 comments posted 19yrs
posted by mattfinn
5 comments posted 19yrs posted by mattfinn

Latching Relay Circuit Help

Latching Relay Circuit Help Years ago John had one of those cheap alarm switches for his van. It was supposed to work b...
6 comments posted 19yrs
posted by tarballs
6 comments posted 19yrs posted by tarballs

Can we make our own PCB?

Hello... I'd like to ask whether we can make our own PCB. Is there any tools to make it? Is it hard to make it? Usually...
7 comments posted 19yrs
posted by mohdwahidi
7 comments posted 19yrs posted by mohdwahidi

PWM vs Analog Output

Hi all, Thanks for everything that you write before i have learnd a lot of from this group. I am designing a circuit wh...
6 comments posted 19yrs
posted by leventkomurcu
6 comments posted 19yrs posted by leventkomurcu