Hobby Electronics Basics

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voltage comparator question

Hi All I am controlling the output of a bicolor LED using a dual comparator (393), however when the input voltage hover...
6 comments posted 17yrs
posted by 10yrcc
6 comments posted 17yrs posted by 10yrcc

How to test speaker ohms?

I want to replace the midrange of a Fisher speaker model ST-440 "Studio Standard Series". No idea what vintage it is -...
36 comments posted 17yrs
posted by muzician21
36 comments posted 17yrs posted by muzician21

Can fixed-voltage regulators be paralled up?

Can fixed-voltage regulators be paralled up to cope with higher currents. (eg the 2 Amp L78S24CV 24 Volt fixed voltage r...
4 comments posted 17yrs
posted by dave
4 comments posted 17yrs posted by dave

power on/off pop problem

I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my...
9 comments posted 17yrs
posted by jamesgangnc
9 comments posted 17yrs posted by jamesgangnc

Can DC voltage be doubled to drive 10 V relay ?

Have some cheap 10 volt relays. My project will consist of 74HCT gates supplied by 5 volts. Is there any way of doublin...
15 comments posted 17yrs
posted by SidErraytor
15 comments posted 17yrs posted by SidErraytor

Need advice on designing an eight Layer PCB

I=92m designing an eight Layer PCB Board that has LVDS signals in frequency of 700Mbps. I have read lots of Document re...
1 comments posted 17yrs
posted by ali0alavi
1 comments posted 17yrs posted by ali0alavi

Chinglesh? 0V to 25V 10A power supply

When friends want Variable power supply Switching Regulator Circuit. I thinks this circuit may like friends certainly....
0 comments posted 17yrs
posted by default
0 comments posted 17yrs posted by default

Power Supply vs Adaptor

My DSL modem came with an adaptor. It burnt. I bought a new cheap adaptor, it burnt too and the next one too. So some o...
2 comments posted 17yrs
posted by bijli
2 comments posted 17yrs posted by bijli

how can I deal with a current spike?

Hello, I'm going to be driving a capcitive load out from a couple opamps, both the opamps are acting as buffers, and no...
12 comments posted 17yrs
posted by panfilero
12 comments posted 17yrs posted by panfilero

Repairing CDI ignition unit

Anybody know how a CDI ignition system for a small petrol engine works? I have taken one of them apart, but managed to...
19 comments posted 17yrs
posted by invalid
19 comments posted 17yrs posted by invalid

Where is John Popelish?

I haven't seen any posts from John for a few months. I hope he is okay. --- Joe
4 comments posted 17yrs
posted by none
4 comments posted 17yrs posted by none

help needed for rs485 !!!!

Hi to newsgroup I want to implement an RS485 interface to an microcontroller with the purpose of creating a network of...
9 comments posted 17yrs
posted by michaelnikolaou_remove_me_
9 comments posted 17yrs posted by michaelnikolaou_remove_me_

Help with capacitor idenification please

Can you help me work out the values of these two capacitors? The first capacitor is much bigger than the second. Can yo...
0 comments posted 17yrs
posted by billgates
0 comments posted 17yrs posted by billgates

Add s-video input to TV?

As a matter of interest, and the fact that I like to tinker... - I'm wondering if it is possible to add an s-video inpu...
3 comments posted 17yrs
posted by mgwiebe
3 comments posted 17yrs posted by mgwiebe