Hobby Electronics Basics

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REQ: timer and/or switching schematic

Hey all. I have a car with courtesy lighting circuit that is always hot. When the doors are opened it grounds the syste...
2 comments posted 18yrs
posted by kurt_SPAMLESS
2 comments posted 18yrs posted by kurt_SPAMLESS

mosfet gate drive impedance

I have a situation where I need to use a pretty stiff pull-up resistor on a mosfet gate because I'm going to use a comp...
17 comments posted 18yrs
posted by nospam
17 comments posted 18yrs posted by nospam

Voltage Regulator - surprise

re Voltage Regulator Hi, I read the reply by John Popelish (to a 2002 post) on the Power dissipated by a regulator - wh...
9 comments posted 18yrs
posted by JohnNicolet
9 comments posted 18yrs posted by JohnNicolet

Home-use microcontroller purchase

Hi: I took a few microcontrollers classes years ago and would like to start using one at home. I've been looking at a f...
14 comments posted 18yrs
posted by davidd31415
14 comments posted 18yrs posted by davidd31415

Cable box + cable feed

Hi I've been trying to send my cable box to chan 3 which works; and then get the other channels 05 to 55 to be able to...
4 comments posted 18yrs
posted by scredcropshonnospam
4 comments posted 18yrs posted by scredcropshonnospam

Inexpensive transmitter and receiver?

I need an inexpensive receiver to hook up to a high intensity speaker (I'm thinking a smoke alarm speaker). I'm going t...
13 comments posted 18yrs
posted by davidd31415
13 comments posted 18yrs posted by davidd31415

possible to modify VCR into timelapse recorder ?

i realize there may be other more eficient means with the advent of cheap digital capture but this was more of a hobby...
3 comments posted 18yrs
posted by some
3 comments posted 18yrs posted by some

Battery Types

Hello, I'm starting some research to collect information about battery types, their properties, and best practice in te...
3 comments posted 18yrs
posted by treboona
3 comments posted 18yrs posted by treboona

how to turn a universal motor into a generator

I took apart an old vacuum cleaner with 12 amp motor, made for U.S. 60 Hz AC household use so I could experiment with t...
4 comments posted 18yrs
posted by nospam
4 comments posted 18yrs posted by nospam

Voltage regulation

Suppose you have a 12V supply and need to power a 5V device. If that device is a simple resistive load like say an inca...
6 comments posted 18yrs
posted by 1qazse4
6 comments posted 18yrs posted by 1qazse4

How should I combine these sensor outputs?

If I had an array of these sensors - each one reading the light from a single scanning laser beam (ie only one sensor i...
1 comments posted 18yrs
posted by kasterborus
1 comments posted 18yrs posted by kasterborus

Reducing Source Voltage To Power Supply

I'm building a power supply for an 8 transistor radio, that originally used 6 "D" cells, involving a rectifier bridge,...
17 comments posted 18yrs
posted by the1930s
17 comments posted 18yrs posted by the1930s

Replacing EL backlit LCD with LED backlit LCD

One of the panels on the bridge has an EL backlit LCD. The backlight on this unit fades badly over time and the inverte...
1 comments posted 18yrs
posted by captain
1 comments posted 18yrs posted by captain