Hobby Electronics Basics

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any op-amp recommendations?

I'm getting ready to order some junk from Digikey. Can someone recommend good general purpose op-amps to stock for tink...
20 comments posted 20yrs
posted by spam
20 comments posted 20yrs posted by spam

Resistors in series/parallel

What will be the combined resistance of this combination of resistors: http://krebs.uk.com/joachim/resistor.jpg Thanks i...
10 comments posted 20yrs
posted by jkrebs
10 comments posted 20yrs posted by jkrebs

IR2153

http://www.irf.com/product-info/datasheets/data/ir2153.pdf I tried to use the IR2153 to run a half bridge using two n-c...
8 comments posted 20yrs
posted by kellrobinson
8 comments posted 20yrs posted by kellrobinson

Amp Capacity

I have some 8 conductor 28 ga.. cable, single strand. I want to do some simple home automation with it, some small rela...
3 comments posted 20yrs
posted by uhuh
3 comments posted 20yrs posted by uhuh

Monitor three or more footswitches over RS-232

I have a footpedal fitted with three footswitches. I want to wire these up to a suitable IC to transmit data (different...
15 comments posted 20yrs
posted by andy_wigley
15 comments posted 20yrs posted by andy_wigley

maintaining constant temperature?

Say I have a metal plate the size of an eraser head. I want it to stay at 140 F using 4 AA batteries. It seems like I c...
12 comments posted 21yrs
posted by leon.park
12 comments posted 21yrs posted by leon.park

DMM Frequency response

Hi, everyone! I'm new to here. I have some questions about measuring AC voltages. I know that low-cost DMMs cannot meas...
8 comments posted 21yrs
posted by shan.hello
8 comments posted 21yrs posted by shan.hello

Voltage Polarity Example

Hi, I'm pretty new to this stuff. I'm trying to teach myself with "Lessons In Electric Circuits" over at ibiblio.org. A...
5 comments posted 21yrs
posted by longjohnstuartmill
5 comments posted 21yrs posted by longjohnstuartmill

Ways to make iron improve heat transfer?

I'm looking for ways to make a 25-Watt non temp control iron with the same temp rating as a 70-Watt hotter than that of...
8 comments posted 21yrs
posted by simoung
8 comments posted 21yrs posted by simoung

Icom R7000

Anyone know about this rcvr. I think they began production in 1986, but some years later ceased. I think they are highl...
4 comments posted 21yrs
posted by wolf_tracks
4 comments posted 21yrs posted by wolf_tracks

Help Getting Started - Simple DC Circuit

(I apologize for posting this basic circuit question. 25 years ago in college I had to know E=IR etc. Just having probl...
18 comments posted 21yrs
posted by MarkJerde
18 comments posted 21yrs posted by MarkJerde

Need help with voltage doubler

I keep blowing capacitors so I need help :) Right now the only two good capacitors I have are 50v 1000uf and 50v 47uf....
5 comments posted 21yrs
posted by ewitte
5 comments posted 21yrs posted by ewitte

Generating pulses from linearly varying resistance

A part called the "throttle switch " for the early Jaguar V12 is no longer available. Its main function is to generate...
11 comments posted 21yrs
posted by jag_manR__EM*-0_V_E653
11 comments posted 21yrs posted by jag_manR__EM*-0_V_E653