Hobby Electronics Basics

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What does this mean?

HI, friends, I recently read Dr. Howard 's book, but i cannot understand " flat frequency reponse" , could anyone tell m...
3 comments posted 19yrs
posted by jasonleehan
3 comments posted 19yrs posted by jasonleehan

Is my DMM broken (cannot read current)?

Hi, I just bought a cheap DMM (Elenco M-1000C), and I believe that the low-range current reader is broken. The DMM has...
10 comments posted 19yrs
posted by mentalray
10 comments posted 19yrs posted by mentalray

Could someone please explain how this works?

Greetings All, This link: http://www.vellemanusa.com/downloads/0/manual_mk138.pdf is the schematic for a thermostat kit...
5 comments posted 19yrs
posted by etpm
5 comments posted 19yrs posted by etpm

Using speaker signal to actuate switch?

Greetings All, I have an electronic thermometer that uses a piezo speaker for an audio alert when the temperature reach...
7 comments posted 19yrs
posted by etpm
7 comments posted 19yrs posted by etpm

GFCI questions

Hello all, I have an outdoor fountain, that uses a submerged electric pump to pump the water. It has worked flawlessly...
3 comments posted 19yrs
posted by biscuitbecks
3 comments posted 19yrs posted by biscuitbecks

Ground fault

Good day I have a little problem with my ground fault always tripping. I have an above ground pool with a 1hp pump. I h...
22 comments posted 19yrs
posted by rickj
22 comments posted 19yrs posted by rickj

Online parts stores? Where do you buy your stuff?

hi, I've been looking around for a good online store to chop for things like Transistors, Diodes, Resistors ... etc Doe...
12 comments posted 19yrs
posted by rbhkamal
12 comments posted 19yrs posted by rbhkamal

Parallel Volt Regs And Ballast Resistors

Hi, I'd like to put some volt regs in parallel and the datasheet advises a 0.015R resistor in the output. Is this a req...
8 comments posted 19yrs
posted by mQiQcQhQaQeQlQhQiQmQsQ
8 comments posted 19yrs posted by mQiQcQhQaQeQlQhQiQmQsQ

flashlight

I have a flashlight that produces a very bright spot in the center and even light outside of it. The bright spot tends...
5 comments posted 19yrs
posted by bob
5 comments posted 19yrs posted by bob

Home brew PCB Advice

I've been trying to make a PCB at home using the iron toner transfer method, as illustrated at these sites. http://www....
12 comments posted 19yrs
posted by spamme
12 comments posted 19yrs posted by spamme

What is PLL "charge pump gain"?

Hi All, Is a PLL charge pump circuit's specification of 'charge pump gain' simply the maximum current that the charge p...
11 comments posted 19yrs
posted by billcalley
11 comments posted 19yrs posted by billcalley

Half-wave rectifier opamp in single supply

Good day! I have the following circuit: http://www.bayimg.com/NabJOAABE Just looking at the configuration on paper, the...
5 comments posted 19yrs
posted by mr.whatever
5 comments posted 19yrs posted by mr.whatever

M5450B7 - 34output LED driver

Hi, DataSheet: http://www.ortodoxism.ro/datasheets/SGSThomsonMicroelectronics/mXqrr.pdf I have a few of these and is tr...
0 comments posted 19yrs
posted by nospam
0 comments posted 19yrs posted by nospam

Ideas For 675 Ah 48 volt Battery Bank Charger?

Hi. I have a 48 volt battery bank (675 Ah) supplying my Outback Inverters which are connected to my house wiring. I am...
7 comments posted 19yrs
posted by eatmyspam
7 comments posted 19yrs posted by eatmyspam

Newbies question about R/C servos

Hi, I have a module that takes output signal from a standard R/C receiver for servos to control 2 DC motors (Tamiya Kin...
1 comments posted 19yrs
posted by chau.nguyenviet
1 comments posted 19yrs posted by chau.nguyenviet