Hobby Electronics Basics

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coutdown 555 timer values?

I'm needing to put together a series of timers. Plan is to have6 timers all triggered at the same time. The first shoul...
41 comments posted 21yrs
posted by robot
41 comments posted 21yrs posted by robot

Lissajou patterns

Hi! I am having problems with displaying Lissajou patterns (for educational purpose) with a Tektronix 2246 and I need s...
9 comments posted 21yrs
posted by cubik
9 comments posted 21yrs posted by cubik

cheap pcb

hi all I am looking for a place that does cheap small run pcb's (5-10).
7 comments posted 21yrs
posted by dimention11
7 comments posted 21yrs posted by dimention11

Ground loop isolator recommendations?

Hi, I'm trying to remove a 60Hz hum from the outputs of a 3phase amplifier used to control an electro-dynamic shaker. I...
3 comments posted 21yrs
posted by davidd31415
3 comments posted 21yrs posted by davidd31415

Car battery charger with funny design ?

I notice most of the car battery charger circuit which using SCR to control allway put one adjustable resistor connecte...
0 comments posted 21yrs
posted by mowhoong
0 comments posted 21yrs posted by mowhoong

converting probles to clamp-on

Is there some adapter device that can convert from plug-in probes to clamp-on? (like for an ammeter). Thanks.
16 comments posted 21yrs
posted by pzion.naax
16 comments posted 21yrs posted by pzion.naax

Protoboards & High Frequencies

If I wanted to use a MCU or clocked PLD with a protoboard, what would be the maximum frequency I could work at without...
5 comments posted 21yrs
posted by protospherex
5 comments posted 21yrs posted by protospherex

a question about the TV remote control

I want to do a remote control circuit for my TV in addition to the original TV one. I hope if any one can help me. Thank...
2 comments posted 21yrs
posted by EBedeer
2 comments posted 21yrs posted by EBedeer

LEDs

I have a bunch of LEDs that I want to wire in series of 3, and then wire each series to my battery in parrellel. I have...
14 comments posted 21yrs
posted by upgrdman
14 comments posted 21yrs posted by upgrdman

are there any flexible/bendable project boards?

I have a RC car, and 100 or so bright LEDs that I want to use to illumate the outline of my car with a projected ellips...
5 comments posted 21yrs
posted by upgrdman
5 comments posted 21yrs posted by upgrdman

VA rating for switches?

I've tried Googling to answer a question, but had no luck. Mechanical switches often have a "VA" rating and I am trying...
6 comments posted 21yrs
posted by redbelly98
6 comments posted 21yrs posted by redbelly98

Analog to Digital Converter 12 Volts

Dear All, I need to know if you have or know of any analog to digital converters that can fully convert 12 volts of inp...
7 comments posted 21yrs
posted by c_koeber
7 comments posted 21yrs posted by c_koeber

want short pulse on switching circuit on

I'd like a short high pulse on powering a circuit up, the pulse will reset a counter. Something 555 based or simpler wou...
3 comments posted 21yrs
posted by roy
3 comments posted 21yrs posted by roy