Hobby Electronics Basics

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555 timer triggering

Thanks for the replys. I am using the monostable configuration that is shown in the datasheet (unsure of manufacture bu...
2 comments posted 16yrs
posted by chuckd87106
2 comments posted 16yrs posted by chuckd87106

Pole Mount Distribution Transformer Design

Hi everyone, I'm currently trying to design a 20kVA (11kV - 230V) pole mount distribution transformer for a project. I'...
7 comments posted 16yrs
posted by zxc981
7 comments posted 16yrs posted by zxc981

VCC width

When I started designing PCBs, I was given an advice to route GND with 50mils and VCC with 25mils. But now I read on th...
20 comments posted 16yrs
posted by aleksazr
20 comments posted 16yrs posted by aleksazr

Quick Test for Optocoupler needed

I need to test a Sharp PC817 Optocoupler. Can I apply a 1.5 volt AA cell to pins 1 and 2 (pin 1 the positive side)... t...
4 comments posted 16yrs
posted by bob
4 comments posted 16yrs posted by bob

PIC prgramming

I'm trying to program a PIC 16F628A using a Matrix Multimedia HP488 programmer with PPP ver 3. The PIC should be respon...
8 comments posted 16yrs
posted by Periproct
8 comments posted 16yrs posted by Periproct

How can a Philips AC-DC transform make so much noise?

Hi, I am using a Philips HQ 8000 100-240V /D 50-60 Hz, 9W, shaver charger and transformer. I always let it plugged in,...
14 comments posted 16yrs
posted by merciadriluca
14 comments posted 16yrs posted by merciadriluca

How do GPS tracking devices work?

Specifically, how do they transmit if they are, for example, inside a shipping container? Is there a hole drilled for a...
16 comments posted 16yrs
posted by fbt
16 comments posted 16yrs posted by fbt

Pulse transformers

As i understand, transformers are meant to pass A/C currents, and block DC currents. How then is a pulse transformer cre...
7 comments posted 16yrs
posted by physics.curio
7 comments posted 16yrs posted by physics.curio

current conveyor

I was reading this article http://electronicdesign.com/article/power/design-a-differential-voltage-controlled-current-s...
2 comments posted 16yrs
posted by nospam
2 comments posted 16yrs posted by nospam

Best Light for reading?

When choosing a Flourescent Bulb for a Task Light what is the best for reading.......my choices are 2700 Kelvin, 3000, 3...
4 comments posted 16yrs
posted by don
4 comments posted 16yrs posted by don

Voltage controlled oscillator question

Could someone please clarify the following ? Consider a LC-tank and a ring oscillator based voltage controlled oscillat...
23 comments posted 16yrs
posted by dakupoto
23 comments posted 16yrs posted by dakupoto